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December 6 to December 12: This week in Denver weather history

December 6, 2015 Thornton Weather Leave a comment

Denver and Colorado are certainly known for their varied weather conditions and as always, looking back at the weather history books highlights that. On these dates we have seen Arctic cold and balmy temperatures in the 70’s. We have seen hurricane force winds and even a rare December thunderstorm. And as one would expect, there has been plenty of snow.

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.

3-15

In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th. Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th. The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.

4-6

In 1960…heavy snowfall totaled 12.0 inches over the 3 days with 5.1 inches on the 4th…5.2 inches on the 5th…and 1.7 inches on the 6th. Rain changed to snow early on the 4th and ended by early afternoon. Snow started again early on the 5th and continued through midday on the 6th. West northwest winds gusted to 30 mph on the 4th. Post cold frontal temperatures cooled from a high of 38 degrees on the 4th to a low of 7 degrees below zero on the 6th.

5-6

In 1883…a major snow storm hit the city. Heavy snow fell from 10:00 am on the 5th to 7:30 am on the 6th. The amount of snowfall was not recorded…but precipitation from melted snow totaled 1.75 inches…which would give an estimated snowfall of nearly 18 inches. Temperatures during the storm were in the 30’s…so some of the snow May have melted as it fell. However…railroads were blocked and telegraph lines were downed in all directions. Telephone wires and poles were nearly all broken down. The company manager estimated the damage at 30 thousand dollars. Northeast winds were sustained to 24 mph in the city.

In 1892…heavy snow totaled 6.2 inches in downtown Denver. Most of the snow…6.0 inches…fell on the 6th.

In 2001…high winds developed in the foothills northwest of Denver. Winds gusted to 74 mph at aspen springs. West- northwest winds gusted to 35 mph at Denver International Airport…where the temperature warmed to a high of 55 degrees on the 6th.

5-7

In 1978…a major storm dumped heavy snow across metro Denver. At Stapleton International Airport…snowfall totaled 8.5 inches…northeast winds gusted to 46 mph…and temperatures plunged from a high of 49 degrees on the 5th to a low of only 6 degrees on the 6th. Maximum temperature of 6 degrees on the 7th was a new daily record low maximum reading. Most of the snow…6.7 inches…fell on the 5th.

5-8

In 1983…high winds occurred in and near the foothills each day. Wind gusts to 63 mph were registered in Golden Gate Canyon on the evening of the 5th. On the evening of the 6th…winds knocked down trees…snapped power lines…and blew out windows across metro Denver. Gusts were clocked to 102 mph in southwest metro Denver…while wind gusts to 38 mph were recorded at Stapleton International Airport. On the 7th…winds overturned a tractor trailer near Castle Rock. After midnight on the 8th…gusts to 97 mph were reported in southeast Boulder. Wind speeds of 60 to 70 mph were reported in other parts of metro Denver.

In 1939…high temperature of 73 degrees was a record maximum for the date. Low temperature of 44 degrees was a record high minimum for the date.

In 1967…strong west winds produced blowing dust at Stapleton International Airport where a wind gust to 55 mph was recorded. A heavy windstorm caused minor damage in Boulder. In Denver…some structural panels were blown from a building… And the screen of an outdoor theater was severely damaged. There were unofficial reports of wind gusts to 75 mph in metro Denver.

In 1977…wind gusting to 85 mph raked the foothills from Boulder to Morrison. A few houses under construction were blown down. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1991…high in the atmosphere…a volcanic ash cloud was clearly visible in the direction of the sun during the late morning and early afternoon.

6-7

In 1953…high winds buffeted the eastern foothills. Wind gusts to 80 mph occurred on Lookout Mountain. In Denver winds gusted to 65 mph. Damage in Boulder totaled 15 hundred dollars.

In 1897…west winds were sustained to 53 mph with gusts to 66 mph. The Chinook winds warmed the temperature to a high of 62 degrees…the warmest day of the month.

In 1957…a vigorous cold front produced a dust storm as it moved south across metro Denver. West-northwest wind gusts to 59 mph were recorded at Stapleton Airport where the surface visibility was briefly reduced to 1/2 mile in blowing dust. Light snowfall of only 0.8 inch followed the passage of a secondary Canadian cold front.

In 1958…the worst wind storm in several years caused 10 thousand dollars damage in Boulder where wind gusts were estimated to 75 mph.

In 1977 winds up to 115 mph were reported in the Boulder area where one house was unroofed and another damaged. One woman was knocked down by the wind and injured. Several families were evacuated from homes in Boulder. Damage to trailers and motor vehicles was widespread. West winds gusted to 54 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 64 degrees.

In 1987…strong winds buffeted the Front Range foothills. A peak gust to 93 mph was recorded at the National Center for Atmospheric Research in Boulder. Nearby…a metal shed was blown over a fence into a tree two houses away. Wind gusts of 70 to 80 mph were common in Boulder.

In 1988…4 to 8 inches of snow fell across metro Denver and caused traffic gridlock conditions on area highways. The 3.9 inches of snow at Stapleton International Airport caused two-hour flight delays. Northeast winds gusted to 25 mph.

In 2005…a brief cold snap resulted in record breaking temperatures. The low temperature of 13 degrees below zero was a record minimum for the date. The high temperature of only 3 degrees was a record low maximum for the date. The cold temperatures were accompanied by 1.4 inches of light snow that was measured at Denver Stapleton overnight on the 6th and 7th.

7-9

In 1919…an apparent arctic cold front brought extreme cold and light snow to the city. Snowfall totaled only 2.5 inches on the 7th and 8th. Temperatures dipped to lows of 14 degrees below zero on the 8th and to 20 degrees below zero on the 9th. Both readings were daily record minimums. High temperatures were only 4 degrees on the 8th and 7 degrees on the 9th.

In 1923…a major storm dumped 13.5 inches of snowfall on downtown Denver. The apparent post-frontal snowfall started during the late afternoon of the 7th and continued through the evening of the 9th. Temperatures dipped from a high of 66 degrees on the 7th with west winds sustained to 35 mph to a low of only 14 degrees on the 9th…with north winds sustained to 25 mph.

In 1880…severe winds buffeted the eastern foothills…causing some damage in Boulder.

In 1987…high winds damaged a chimney and roof of a house near Bergen Park in the foothills west of Denver. Gusts were estimated to 70 mph. Northwest winds gusted to 33 mph at Stapleton International Airport.

8-9

In 1943…4.5 inches of snow fell in downtown Denver. This was the only measurable snow of the month. North winds were sustained to 26 mph on the 8th.

In 2003…snowfall totaled 3 to 6 inches across metro Denver. Snowfall was heavier in and near the foothills with 8.0 inches measured in Boulder and 10 miles southwest of Sedalia. Snowfall was 3.9 inches at the site of the former Stapleton International Airport. Most of the snow fell on the 8th…as the snow ended shortly after midnight. North winds gusted to 29 mph at Denver International Airport.

In 2008…an upslope snowstorm produced heavy snow in and near the foothills of Boulder…Jefferson and Douglas counties… And along the palmer divide south of Denver. Storm totals in the foothills ranged from 8 to 15 inches. In Boulder and in areas west and south of Denver…storm totals ranged from 6 to 13 inches. The snowfall measurement at Denver International Airport was 3.9 inches.

8-10

In 1985 a slow moving storm dumped 10 to 20 inches of snow over the northeast plains…closing schools and businesses in many areas along the Front Range north of Denver. At Stapleton International Airport…snowfall totaled 9.9 inches with a maximum snow depth of 7 inches on the ground. North winds gusted to 24 mph. The snow caused long air traffic delays at Stapleton International Airport on the 9th.

In 1997…persistent light to moderate snowfall combined with strong and gusty northerly winds to produce much blowing and drifting snow across metro Denver. The hardest hit areas were south of Denver where north winds at speeds of 20 to 35 mph with gusts to 45 mph caused near whiteout conditions. The strong winds produced drifts 2 to 4 feet deep and dropped wind chill temperatures well below zero. Sections of both I-25 and I-70 and other roads were closed as travel became impossible due to blowing snow. Numerous traffic accidents were reported and a handful of people were stranded during the snowstorm. Snowfall totals included: 22 inches at Conifer…13 inches at Castle Rock…12 inches at Parker…and 8 inches in southeast Aurora. Snowfall totaled 5.5 inches at the site of the former Stapleton International Airport. North winds gusted to 36 mph at Denver International Airport on the 10th.

8-12

In 1932…the second longest sub-zero period on record in Denver occurred. The temperature fell below zero shortly after 1:00 pm on the 8th and remained below zero for 92 hours until 9:00 am on the 12th. The lowest temperature recorded during this period was 13 degrees below zero on both the 9th and 11th. That temperature on the 11th was a record low for the date. High temperatures of 4 on the 8th…5 below zero on the 9th…1 below zero on the 10th… And 6 below zero on the 11th were record low maximum temperatures for those dates. Light north winds at 5 to 10 mph were accompanied by occasional light snow…which totaled only 2.2 inches.

In 1898…the very cold air mass that settled over the city behind an apparent cold front on the 7th plunged temperatures to a low of 20 degrees below zero. The high temperature climbed to only 5 degrees.

In 1910…Chinook west winds sustained to 46 mph warmed the temperature to 60 degrees…the warmest reading of the month that year.

In 1919…the minimum temperature dipped to 20 degrees below zero in downtown Denver…setting a record low for the date.

In 1984…high winds occurred in the foothills with a gust to 69 mph recorded at Golden Gate Canyon west of Denver. West winds gusted to 36 mph at Stapleton International Airport.

In 1992…high winds were recorded over most of the day in the Front Range foothills. Wind gusts to 95 mph were measured in the Table Mesa area of Boulder. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1993…a weather observer in Boulder recorded a wind gust to 73 mph. North winds gusted to 37 mph at Stapleton International Airport.

In 1998…metro Denver and areas in the foothills received the first significant snowfall in more than a month. The upslope snow event deposited up to 17 inches in the foothills with generally 4 to 8 inches across metro Denver west of I-25. Snowfall totals included 17 inches at crescent park and 16 inches in nearby Coal Creek Canyon. Other snow amounts included: 16 inches at tiny town; 14 inches at Chief Hosa…Evergreen…and Genesee; 13 inches in Conifer; 12 inches at Nederland; 11 inches in Eldorado Canyon; 9 inches just west of Boulder; 8 inches in Boulder; and 7 inches in Broomfield and Golden. Only 3.6 inches of snow fell at the site of the former Stapleton International Airport. Northeast winds gusted to 26 mph at Denver International Airport.

9-13

In 1961…cold arctic air produced a protracted cold period. The temperature plunged to 16 degrees below zero on the 10th…establishing a new record for the date and the coldest reading since 25 degrees below zero on February 1… 1951. Low temperatures dipped below zero on 5 consecutive days with 9 degrees below zero on the 9th…16 below on the 10th…10 below on the 11th…and 12 below on both the 12th and 13th. High temperatures reached only 3 degrees on the 10th and 6 degrees on the 11th.

In 1953…snowfall totaled 3.8 inches at Stapleton Airport where northeast winds were sustained at speeds to 47 mph and gusted to 60 mph behind a cold front.

In 1969…sustained winds of 30 mph with gusts to 55 mph in downtown Boulder caused minor damage. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1980…winds to 60 mph whistled through Boulder.

In 1987…strong winds in the foothills spread over northern portions of metro Denver. Wind gusts of 60 to 75 mph were common in Boulder and southwestern weld counties. However… The highest reported wind gust…94 mph…occurred near Rollinsville. A northwest wind gust to 36 mph was recorded at Stapleton International Airport.

10-11

In 1933…downslope winds produced warm temperatures…resulting in record high minimums of 46 degrees on the 10th and 44 degrees on the 11th. High temperatures of 66 degrees on the 10th and 62 degrees on the 11th were not records. Southwest winds were sustained to 16 mph on the 10th.

In 1939…high temperatures of 70 degrees on the 10th and 74 degrees on the 11th were record maximums for the dates. The low temperatures of 39 degrees on the 10th and 41 degrees on the 11th were not records.

In 1948…high winds in Boulder and Louisville caused 1750 dollars in damage. Wind gusts in excess of 70 mph were reported at Valmont and Boulder airport. Chinook wind gusts to 60 mph briefly reduced the visibility to 1/4 mile in blowing dust at Stapleton Airport.

In 1989…the season’s greatest snowfall to date hit metro Denver with 6 to 12 inches of snow. Flight delays at Stapleton International Airport reached 2 hours. Multiple wrecks snarled traffic on I-25 both north and south of the city. Snowfall totaled 7.0 inches at Stapleton International Airport where north winds gusted to 25 mph on the 10th.

In 1938…snowfall totaled 3.7 inches in downtown Denver. North winds were sustained to 21 mph with an extreme velocity to 22 mph.

In 1967…wind gusts to 58 mph in downtown Boulder caused minor damage. Northwest winds gusted to 47 mph at Stapleton International Airport.

In 1980…winds to 60 mph were reported in Boulder. Northwest winds gusted to 23 mph at Stapleton International Airport. The Chinook winds warmed temperatures to a high of 67 degrees.

In 1994…strong gusty winds occurred along the Front Range eastern foothills. A wind gust to 67 mph was recorded in Boulder with a gust to 58 mph measured at Jefferson County airport near Broomfield. No damage was reported. Northwest winds gusted to 31 mph at Stapleton International Airport.

11-12

In 1903…a sharp cold front on the 11th plunged temperatures from a high of 59 degrees to a low of 15 degrees…produced northeast winds sustained to 42 mph along with gusts as high as 60 mph…and produced 1.3 inches of snow overnight. The high temperature on the 12th was only 25 degrees.

In 1968…strong winds buffeted the eastern foothills and plains and caused light…but widespread property damage. Wind gusts of 50 to 75 mph were reported. West winds gusted to 52 mph at Stapleton International Airport.

11-13

In 1940…5.4 inches of snow fell across downtown Denver. This was the only snowfall of the month. Temperatures were quite cold on the 13th with a high of 6 degrees and a low of 2 degrees below zero.

In 1984…up to 6 inches of new snow fell over metro Denver… Hampering flight operations at Stapleton International Airport where snowfall totaled 3.8 inches and east winds gusted to 25 mph on the 11th.

In 1937…a thunderstorm…rare in December…produced 0.09 inch of rain in advance of a cold front.

In 1973…high winds occurred across all of metro Denver with the foothills area being hit the hardest. A wind gust to 120 mph was recorded in Boulder where damage to residences…mobile homes…fences…and buildings totaled 100 thousand dollars. A northwest wind gust to 66 mph occurred at Stapleton International Airport.

In 1988…strong winds were recorded in Boulder. Peak wind gusts reached 70 mph at Table Mesa and 61 mph in east Boulder. West winds gusted to 31 mph at Stapleton International Airport.

12-13

In 1916…snowfall totaled 5.7 inches in downtown Denver. Northeast winds were sustained to 27 mph with gusts to 28 mph on the 12th.

In 1992…an upslope snowstorm whitened metro Denver. While snowfall totaled only 4.1 inches at Stapleton International Airport…7 inches of new snow fell in Morrison…with 12 inches measured in Castle Rock. North winds gusted to 23 mph at Stapleton International Airport on the 13th.

In 1995…strong winds gusting to nearly 100 mph whipped across the foothills west of Denver. The strongest wind gusts included 98 mph atop Squaw Mountain and 75 mph at the Eldora Ski Area. West-northwest winds gusted to 41 mph at Denver International Airport on the 13th.

12-15

In 1921…downslope Chinook winds produced warm temperatures in the city…which resulted in 4 temperature records. High temperatures of 72 degrees on the 13th and 68 degrees on the 15th were record maximums for the dates. Low temperatures of 47 degrees on both the 12th and 13th were record high minimums for the dates. West winds were sustained to 38 mph on the 12th and to 25 mph on the 13th.

Thornton Weather

November 29 to December 5: This week in Denver weather history

November 29, 2015 Thornton Weather Leave a comment

As always, our look back at Denver’s weather history books is very eventful. As we start to get closer to winter, we begin to see many more multi-day snow events that are notable and this week’s look is no different. We see many major snow events and also of note are the damaging high wind events.

From the National Weather Service:

25-29

In 1985…dense fog with visibilities as low as 1/8 mile occurred on five consecutive days at Stapleton International Airport. The fog was at times accompanied by light snow… Light freezing drizzle…or ice crystals. Fog occurred all day on both the 26th and 29th.
28-29 in 1908…heavy snowfall overnight and for most of the day on the 29th totaled 12.5 inches. Precipitation was 1.09 inches. Northwest winds were sustained to 26 mph on the 29th.

In 1928…a major storm dumped 15.5 inches of snowfall on downtown Denver. North winds were sustained to 18 mph with gusts to 19 mph on the 28th.

In 1992…an upper level storm system moved across metro Denver…but left only a dusting of snow. Snowfall totaled only 1.6 inches at Stapleton International Airport where north winds gusted to 25 mph. Other snow amounts included: 8 inches at Conifer…6 inches at Lake Eldora…3 inches at Rollinsville and in southeast Denver.

In 1997…a storm system tracking across northern New Mexico produced strong north to northeast upslope flow against the eastern slopes of the Front Range and Palmer Ridge. Snowfall totals in Jefferson County included: 14 inches near Deckers; 12 inches at Castle Rock and Sedalia; 10 inches near Conifer…11 miles southwest of Morrison…and at Buffalo Creek. Elsewhere…snow accumulations were less. Snowfall totaled only 0.7 inch at the site of the former Stapleton International Airport on the 27th and 28th.

In 2004…heavy snow fell in the foothills and across metro Denver. In the foothills…snowfall totals included: 13 inches at Roxborough State Park and Eldorado Springs… 11.5 inches near Conifer…11.0 inches near Nederland…and 10 inches near Indian Hills. Across metro Denver snowfall totaled 14 inches near Sedalia…9 inches near Louisville… 8 inches at Ralston Reservoir…and 5.1 inches in the Stapleton area of Denver. Northeast winds gusted to 28 mph at Denver International Airport on the 28th.

In 2006…a slow moving storm system brought heavy snow to the mountains and to the eastern foothills where snowfall ranged from 8 to 18 inches. Some of the more impressive snow totals included: 18 inches at Genesee…17.5 inches near Boulder…17 inches at aspen springs…16.5 inches 10 miles northwest of Golden…15 inches at Eldorado Springs… 14.5 inches in Idaho Springs and near Jamestown…12 inches in grant and near Indian Hills…11.5 inches near Blackhawk… 11 inches at gross reservoir and Eldora…and 10.5 inches in Conifer. Across metro Denver…storm total snowfall generally ranged from 5 to 9 inches with the heaviest amounts near the foothills in Boulder and Jefferson counties. The most impressive totals included: 15.5 inches at Ken Caryl…12 inches in Boulder…7.5 inches near Morrison…and 7 inches near both Chatfield and Ralston reservoirs. Snowfall totaled only 4.2 inches in the Denver Stapleton area. Northeast winds gusted to 31 mph at Denver International Airport on the 28th.

28-30

In 1991…a winter storm dumped heavy snow in the foothills and near the Palmer Divide with 10 inches recorded at Conifer and Golden Gate Canyon…12 inches in Morrison… 6 inches at Castle Rock and Parker. Only 3.4 inches of snow fell at Stapleton International Airport where north winds gusting to 35 mph on the 29th…produced some blowing snow. Some light freezing drizzle also fell on the 28th and 29th.

In 1877…the all-time lowest recorded minimum temperature in the month of November…18 degrees below zero…occurred. The high temperature for the day was 16 degrees.

In 1899…northwest winds were sustained to 51 mph with gusts as high as 60 mph. The Chinook winds warmed the temperature to a maximum of 74 degrees…a record high for the date and the warmest of the month that year. The minimum temperature was only 39 degrees.

In 1927…post-frontal rain changed to snow and totaled 5.8 inches over downtown Denver. Northeast winds were sustained to 22 mph.

In 1977…85 mph winds were reported at Wondervu in the foothills southwest of Boulder. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1980 strong Chinook winds reached 85 mph in Boulder… Blowing traffic signals and street lights down. Some windows were shattered by the wind. West winds gusted to 37 mph at Stapleton International Airport.

In 1994…high winds blew across the Front Range eastern foothills. Wind gusts to 92 mph occurred atop squaw mountain…5 miles south of Idaho Springs…and to 82 mph on fritz peak near Rollinsville in the foothills southwest of Boulder. A wind gust to 75 mph was recorded at Jefferson County airport near Broomfield. Northwest winds gusted to only 35 mph at Stapleton International Airport. No damage was reported.

29-30

In 2008…a storm system produced locally heavy bands of snow across Douglas…Elbert and eastern Jefferson counties. Northerly winds gusting to 50 mph caused snow drifts to pile up to 2 feet in depth. Storm totals included: 12 inches just southwest of Kassler…11.5 inches…6.5 miles southwest of Castle Rock; 11 inches…8.4 miles southeast of Aurora and 9 miles west of Littleton; 10 inches at Louviers… 8 inches…2 miles west-southwest of Highlands Ranch and 5 miles south-southeast of Sedalia…and 7.5 inches…14 miles west-southwest of Agate and at Castle Pines. At Denver International Airport…2 inches of snow was observed. North winds gusted to 46 mph on the 30th.

In 1899…west winds were sustained to 45 mph with gusts as high as 48 mph.

In 1903…west winds sustained to 44 mph with gusts to 54 mph warmed the temperature to a high of 57 degrees.

In 1981…strong winds blasted the foothills. In Wondervu… Winds were clocked to 81 mph with many other locations in the foothills reporting over 60 mph. Northwest winds gusted to 28 mph at Stapleton International Airport.

In 1986…the worst snow storm of the season dumped from 5.0 inches of snow at Stapleton International Airport to 14 inches over the higher southwestern suburbs. On the Sunday after thanksgiving…one of the busiest travel days of the year at Stapleton International Airport…two of the four runways were closed and flights were delayed up to four hours. Near-blizzard conditions prevailed on the plains east of Denver…closing both I-70 and I-76 for a time. North wind gusts to 36 mph were recorded at Stapleton International Airport.

In 2000…strong winds raked metro Denver. In Thornton…a construction worker was critically injured when the scaffolding on which he was standing collapsed…throwing him 25 feet to the ground. West winds gusted to 54 mph at Denver International Airport.

Continue reading November 29 to December 5: This week in Denver weather history →

Weather History

November 22 to November 28: This week in Denver weather history

November 24, 2015 Thornton Weather Leave a comment

This time period in November has been exceedingly eventful throughout Denver weather history. Notable as usual are big wind events that have caused damage and injuries. Snow of course is also quite present, including the Thanksgiving blizzard of 1983 which dumped an astounding 21.5 inches of snow on the Mile High City.

From the National Weather Service:

21-22

In 1905…a trace of snow fell on both days in downtown Denver. This was the only snow of the month…ranking the month along with other Novembers…the 2nd least snowiest on record.

In 1999…the first significant snowfall of the season struck metro Denver. Snowfall totals included: 16 inches near bailey; 13 inches near evergreen; 12 inches at north turkey creek…Genesee…near Morrison…and near Sedalia; 11 inches near Conifer and in evergreen; 10 inches in Louisville; 9 inches in Brighton…Broomfield…and Denver; and 8 inches at Arvada…Castle Rock…and Eldorado Springs. Snowfall totaled 8.4 inches at the site of the former Stapleton International Airport.

In 2003…heavy snow fell in and near the foothills of Boulder County. Snowfall totaled 10.5 inches in Eldorado Springs. Across the city…snowfall was lighter with 2.8 inches measured at the site of the former Stapleton International Airport on the 22nd. North winds gusted to 32 mph at Denver International Airport on the 22nd.

21-23

In 1918…post-frontal snowfall totaled 5.9 inches in downtown Denver. Most of the snow…5.3 inches…fell on the 22nd. North winds were sustained to 20 mph on the 21st.

In 1931…a major storm dumped a total of 13.2 inches of snowfall over downtown Denver. Most of the snow…11.4 inches…fell on the 21st. A very cold air mass settled over the city after the heavy snow on the 21st. After a low temperature of zero…the temperature climbed to a high of only 5 degrees on the 22nd…a record low maximum for the date.

21-25

In 1952…snowfall of 6.2 inches was measured at Stapleton Airport where northeast winds gusted to 17 mph on the 21st.

In 1977…101 mph winds were measured in southwest Boulder. The side of a garage was blown down. West winds gusted to only 33 mph at Stapleton International Airport.

In 1981…high winds occurred in the foothills. A peak gust to 75 mph was reported at Wondervu. West winds gusted to 23 mph at Stapleton International Airport.

In 1988…a wind gust to 88 mph was measured at Rollinsville.

In 1990…strong west to northwest winds…on the coat tails of a mountain snow storm the day before…lashed out at portions of the eastern foothills with 60 to 95 mph wind gusts. The strong winds spread over all of metro Denver. A west wind gust to 49 mph was recorded at Stapleton International Airport.

22-23

In 1953…strong winds raked Boulder causing 18 thousand dollars in damage. Wind gusts to 80 mph were recorded at Valmont and estimated to 80 mph at the Boulder airport.

In 1899…a trace of snow fell in the city. This…together with a trace of precipitation on the 16th and 21st…was the only precipitation of the month…making the month the driest on record. The record was equaled in November of 1901 and 1949. This trace of snow along with a trace of snow on the 21st was the only snow of the month…ranking the month the 2nd least snowiest on record. This record was equaled in November of 1884…1901…1905…1917…and 1939.

In 1901…northwest winds were sustained to 45 mph with gusts to 53 mph. The Chinook winds warmed the temperature to a high of 70 degrees.

In 1910…west winds were sustained to 42 mph. The Chinook winds warmed the temperature to a high of 67 degrees.

In 1959…west-northwest winds gusted to 56 mph…briefly reducing the visibility to 3 miles in blowing dust at Stapleton Airport.

In 1998…winds…estimated as high as 58 mph…caused several wood trusses installed in a police station under construction in Castle Rock to collapse. A construction worker on the roof received minor injuries when he was struck by one of the trusses. Southeast winds gusted to 38 mph at Denver International Airport.

23-24

In 1992…a pre-Thanksgiving blizzard belted metro Denver. Gusty north to northeast winds at 30 to 40 mph caused near-whiteout conditions as visibilities were often below 1/4 mile. The strong winds drove snow into drifts of more than 4 feet. Hundreds of holiday travelers were stranded when airlines canceled flights at Stapleton International Airport where snowfall totaled 7.6 inches and north winds gusted to 37 mph. Blizzard conditions began around mid- morning on the 23rd and ended by mid-afternoon…but heavy snow fell through the night. Snowfall totaled: 12 inches at Conifer…Morrison…and Wheat Ridge; 19 inches at Littleton; 16 inches at Castle Rock; 9 inches in Brighton; 8 inches in Aurora; and 6 inches in Parker.

In 1993…a moist upper level disturbance dumped heavy snow over most of Colorado. Snowfall amounts averaged 5 to 8 inches across metro Denver. Snowfall totaled 4.6 inches at Stapleton International Airport where northeast winds gusted to only 20 mph on the 23rd. The very cold air mass caused the temperature to dip to a record low of 8 degrees below zero on the 24th. The temperature that day climbed to only 9 degrees…also setting a record low maximum for the date.

In 1915…Chinook winds from the southwest sustained to 40 mph with gusts to 46 mph warmed the temperature to a high of 61 degrees. It was windy most of the day.

In 1949…the low temperature dipped to 56 degrees…the all-time record highest minimum temperature ever recorded during the month of November.

In 1960…violent wind gusts caused some damage in Boulder. West winds gusted to only 22 mph at Stapleton Airport.

In 1980…a snow storm brought 3 to 6 inches of snow across metro Denver. At Stapleton International Airport…only 2.1 inches of snow fell.

In 1989…high winds were recorded in Boulder with a gust to 64 mph. West winds gusted to only 24 mph at Stapleton International Airport.

24-25

In 1908…heavy snowfall totaled 7.0 inches over downtown Denver overnight. North winds were sustained to 15 mph.

In 1930 strong winds raked the Front Range eastern foothills. Winds gusted to 40 mph at Valmont just east of Boulder where minor damage occurred.

In 1970…strong Chinook winds warmed Boulder. At the National Center for Atmospheric Research in Boulder…wind gusts reached 97 mph…while in downtown Boulder winds peaked to 69 mph. Some minor damage occurred. Northwest winds gusted to 39 mph at Stapleton International Airport…and the high temperature warmed to 76 degrees on the 25th…setting a new record maximum for the date.

In 1877…northwest winds were sustained to 50 mph.

In 1902…northwest winds were sustained to 45 mph with gusts to 48 mph. The strong apparent Bora winds warmed the temperature to a high of only 45 degrees.

In 1943…snowfall of 4.0 inches was the only measurable snow of the month. North winds were sustained to 17 mph.

In 1958…strong pre-frontal Chinook winds struck Boulder and the eastern foothills. A wind gust to 100 mph was recorded northwest of Denver. A gust to 88 mph occurred at Rocky Flats south of Boulder. The windstorm caused considerable structural damage to residential sections of north metro Denver.

In 1959…strong winds raked the eastern foothills including Boulder and Eldorado Springs. Wind gusts to 100 mph were estimated at the Matterhorn restaurant located atop rocky flats south of Boulder.

In 1993…a wind gust to 99 mph was recorded atop Squaw Mountain near Idaho Springs.

In 1998…strong winds developed over portions of the Front Range foothills for a brief time following the passage of a weak upper level disturbance. A wind gust to 71 mph was measured atop blue mountain near Coal Creek Canyon.

In 1999…strong Chinook winds developed in and near the foothills. Peak wind reports included 100 mph at the Eldora Ski Resort and 77 mph at the National Center for Atmospheric Research Mesa Lab above Boulder. West winds gusted to 38 mph at Denver International Airport.

25-26

In 1887…snowfall totaled 2.9 inches in the city. This was the only measurable snow of the month. Northeast winds were sustained to 18 mph on the 26th when the temperature dipped to 12 degrees below zero.

In 1959…a sharp cold front produced a northwest wind gust to 51 mph…followed by snow and falling temperatures from a high of 60 degrees to a low of 23 degrees at midnight on the 25th. Snowfall totaled 4.4 inches at Stapleton Airport before ending early on the 26th.

In 1972…winds gusted to 104 mph at the rocky flats plant south of Boulder. Gusts to 70 mph were recorded at the national bureau of standards in Boulder…while in downtown Boulder winds peaked to 68 mph. Some damage was reported. Northwest winds gusted to 47 mph at Stapleton International Airport on the 26th.

In 1984…blowing snow closed I-70 east of Denver…stranding over a thousand travelers in Limon. Denver received only 2.3 inches of snowfall. North winds gusted to 31 mph at Stapleton International Airport.

In 1999…strong Chinook winds redeveloped overnight in and near the foothills. Peak wind gusts included 72 mph atop Blue Mountain near Wondervu and at the National Center for Atmospheric Research mesa lab above Boulder.

In 2010…high winds developed in the foothills of Boulder County. A gust to 75 mph occurred 5 miles northwest of Boulder with a gust to 72 mph at the National Center for Atmospheric Research mesa lab above Boulder. West winds gusted to 24 mph at Denver International Airport.

25-27

In 1978…heavy snowfall of 6.0 inches was measured at Stapleton International Airport where north winds gusted to 20 mph. Most of the snow…4.8 inches…fell on the 25th. The greatest amount of snow measured on the ground was 5 inches due to settling and melting.

25-28

In 1952…the average coldest 4-day period in November in the previous 81 years of record occurred. Maximum temperatures of 19…15…21…and 25 degrees were recorded. Minimum temperatures were below zero each day with readings of 7 below…6 below…5 below…and 6 below.

25-29

In 1873…west winds increased to a violent gale at 3:00 am and reached a maximum sustained velocity of 56 mph at 3:15 am. The winds continued with a velocity of not less than 40 mph until 6:00 am. Winds continued brisk for the remainder of the day. The strong winds caused damage to houses and buildings in the city. Temperatures were in the 50’s through early afternoon with a recorded high of 59 degrees. Winds also blew strongly in Boulder and caused 300 dollars in damage.

In 1911…post-frontal northeast winds were sustained to 43 mph with gusts as high as 52 mph. Snowfall was only 0.5 inch.

In 1965…post-frontal snowfall totaled 5.5 inches at Stapleton International Airport where strong west winds gusted to 39 mph during the afternoon.

In 1976…2 to 4 inches of snow with an arctic cold front produced near zero visibility at times in blowing snow… Causing multiple automobile accidents in metro Denver. Snowfall totaled 3.5 inches at Stapleton International Airport where north winds gusted to 39 mph. Temperatures hovered in the teens and lower 20’s most of the day dipping to 7 degrees by midnight.

In 1977 a strong wind storm raked metro Denver. High winds blew windows from office towers in Denver and Boulder. Thirteen people were injured in Boulder due to flying debris. Wind gusts to 119 mph were clocked on Davidson Mesa southeast of Boulder…with 109 mph in downtown Boulder. Six airplanes were damaged at Jefferson County airport near Broomfield. Winds to 90 mph were reported in Lakewood. Glass was blown out of several vehicles in Wheat Ridge…and roofs were blown off 4 houses in Arvada. Several houses under construction collapsed across metro Denver. Winds to 75 mph were reported at the Denver federal center with 90 mph at rocky flats. West winds gusted to 51 mph at Stapleton International Airport. Total insured damage from the wind storm was 2.2 million dollars.

In 1987…a Thanksgiving snowstorm brought 5 inches of snow to metro Denver and 6 inches to the foothills. At Stapleton International Airport…snowfall totaled 5.0 inches…north winds gusted to 22 mph…and temperatures hovered in the upper 20’s most of the day.

In 1991…strong winds were recorded in and near the eastern foothills. Winds at Rollinsville were clocked to 70 mph with 45 mph recorded in Boulder and 51 mph at the U.S. Atomic Energy Commission Rocky Flats plant. West winds gusted to only 28 mph at Stapleton International Airport.

26-27

In 1876…heavy snowfall totaled 9.0 inches over the city from 5:00 pm on the 26th through 5:00 p.m. on the 27th. Precipitation was 0.30 inch on the 25th and 0.60 inch on the 27th.

In 1919…an incursion of cold arctic air produced snowfall of 4.6 inches over downtown Denver. Temperatures dipped to 5 degrees below zero on the evening of the 26th and recovered to a high of only 1 degree below zero on the 27th…the all-time record low maximum for the month of November and the record for the date. Northwest winds were sustained to 25 mph with gusts to 26 mph on the 26th.

In 1923…snowfall of 2.0 inches was the only snow of the month. North winds were sustained to 22 mph on the 26th.

In 1972…heavy snowfall totaled 7.5 inches at Stapleton International Airport where north winds gusted to only 18 mph on the 27th.

In 1983…a Thanksgiving blizzard dumped 21.5 inches of snowfall in 37 hours with a maximum of 18 inches on the ground at Stapleton International Airport. The storm produced howling winds…which paralyzed Thanksgiving weekend transportation across all of eastern Colorado. On the 27th…Stapleton International Airport closed… Opening 24 hours later. Interstate Highways were closed in all directions…but west…from Denver. At Stapleton International Airport…north winds gusted to 36 mph on the 26th and to 29 mph on the 27th. However…most wind speeds across metro Denver were 15 to 30 mph. Temperatures hovered in the teens and lower 20’s. Many stores and businesses closed. Several high school football games were postponed. Across metro Denver…snow depth varied from 15 inches in Commerce City to 28 inches near Chatfield Reservoir. Snow removal in Denver was estimated at 1.5 million dollars. Following the storm… An inch or more of snow remained on the ground for 63 consecutive days through January 27…1984. This is the longest period of continuous snow cover ever recorded in Denver.

In 1990…an early winter storm deposited 2 to 8 inches of wet snow across metro Denver. Snowfall totaled 3.4 inches at Stapleton International Airport where northeast winds gusted to 30 mph on the 26th.

In 1993…strong winds swept off the foothills across metro Denver. Sustained winds of 30 to 50 mph were common across the area. Wind gusts to 67 mph were recorded atop Squaw Mountain near Idaho Springs. West winds gusted to 36 mph at Stapleton International Airport on the 26th. The strong winds produced some blowing snow…reducing the visibility to less than one mile at times.

In 1995…snowfall totaled 3.7 inches at the former Stapleton International Airport site. The foothills west of Denver received 4 to 7 inches of snow. North-northeast winds gusted to 34 mph at Denver International Airport on the 26th.

In 1965…strong winds buffeted Boulder…causing 11 thousand dollars in damage. Wind gusts to 75 mph were recorded downtown. West winds gusted to 38 mph at Stapleton International Airport.

In 1994…winds gusted to 87 mph atop Squaw Mountain…5 miles south of Idaho Springs…and to 84 mph on fritz peak near Rollinsville in the foothills southwest of Boulder. Northwest winds gusted to 40 mph at Stapleton International Airport.

In 1884…a windstorm during the afternoon produced northwest sustained winds to 46 mph. Two wooden slats were blown out of the weather instrument shelter…and nearly all of the slats on the north and west sides were loosened.

In 1898…northwest winds were sustained to 50 mph with gusts as high as 80 mph.

In 1902…northwest winds were sustained to 40 mph with gusts to 48 mph. The strong apparent Bora winds warmed the temperature to a high of only 40 degrees.

In 1904…northwest winds sustained to 44 mph with gusts to 58 mph warmed the temperature to a high of 58 degrees.

In 1927…strong west winds occurred in Boulder…causing widespread minor damage. A wind gust to 65 mph was recorded at Valmont east of Boulder. The west winds possibly produced a cyclonic twist.

In 1928…heavy snowfall totaled 7.0 inches over downtown Denver.

In 1957…a vigorous cold front produced north-northeast wind gusts to 54 mph at Stapleton Airport. Light snow following the front totaled only 0.2 inch.

In 1970…strong Chinook winds reached 77 mph in downtown Boulder.

In 1978…wind gusts 60 to 90 mph were reported in and near the foothills.

In 1984…high winds of 60 to 80 mph occurred along the Front Range eastern foothills. In Boulder…the high winds blew the roof off a service station. Several trees were felled… Damaging some cars. An elderly woman was injured when she was knocked down by a wind gust and blown 20 feet into some bushes. Northwest winds gusted to 36 mph at Stapleton International Airport.

In 1994…winds gusted to 72 mph in Boulder. No damage was reported. Northwest winds gusted to 35 mph at Stapleton International Airport.

28-29

In 1908…heavy snowfall overnight and for most of the day on the 29th totaled 12.5 inches. Precipitation was 1.09 inches. Northwest winds were sustained to 26 mph on the 29th.

In 1928…a major storm dumped 15.5 inches of snowfall on downtown Denver. North winds were sustained to 18 mph with gusts to 19 mph on the 28th.

In 2006…a slow moving storm system brought heavy snow to the mountains and to the eastern foothills where snowfall ranged from 8 to 18 inches. Some of the more impressive snow totals included: 18 inches at Genesee…17.5 inches near Boulder…17 inches at Aspen Springs…16.5 inches 10 miles northwest of Golden…15 inches at Eldorado Springs… 14.5 inches in Idaho Springs and near Jamestown…12 inches in grant and near Indian Hills…11.5 inches near Blackhawk… 11 inches at gross reservoir and Eldora…and 10.5 inches in Conifer. Across metro Denver…storm total snowfall generally ranged from 5 to 9 inches with the heaviest amounts near the foothills in Boulder and Jefferson counties. The most impressive totals included: 15.5 inches at Ken Caryl…12 inches in Boulder…7.5 inches near Morrison…and 7 inches near both Chatfield and Ralston reservoirs. Snowfall totaled only 4.2 inches in the Denver Stapleton area. Northeast winds gusted to 31 mph at Denver International Airport on the 28th.

28-30

Weather History

November 15 to November 21: This week in Denver weather history

November 15, 2015 Thornton Weather Leave a comment

Any week in Denver weather history is filled with numerous notable weather events and this week is no different. We have everything from major snowstorms to damaging winds and much more. However, one item is particularly notable and historic. It was on the 20th of November in 1871 that the first, official weather observation took place in Denver. Henry Fenton, Observer Sergeant of the United States Army Signal Service, made the report at 5:43 am. The office was located on the 2nd floor of a building at the corner of Larimer and G Streets, now 16th Street. Scroll down to see what the report said.

From the National Weather Service:

From the 12th to the 15th:

In 1909…light snowfall totaled 6.7 inches in downtown Denver over the 4 days. This was the first measurable snowfall of the season. Northeast winds were sustained to 15 mph on the 12th.

From the 14th to the 15th:

In 1917…overnight rainfall was 0.03 inch. This was the only measurable precipitation of the month…making it the 5th driest November on record.

In 1985…3 to 6 inches of snow fell across metro Denver. Snowfall totaled 3.8 inches at Stapleton International Airport where northeast winds gusted to only 13 mph.

In 2005…a winter storm that brought heavy snow to the mountains also spread heavy snow into the foothills to the west of Denver. Snowfall totals included: 14 inches at Aspen Springs…13 inches near Pinecliffe…and 12 inches near Nederland. Interstate 70 along with U.S. Highway 40 had to be closed near Idaho Springs due to snow…poor visibility in blowing snow…numerous accidents…and an increased avalanche danger. High winds were recorded in the foothills on the 14th. Winds gusted to 89 mph at Georgetown and to 91 mph on Sugarloaf Mountain west of Boulder. Strong microburst winds associated with a dissipating rain shower gusted to 61 mph at Denver International Airport on the 14th.

In 2009…a storm system produced heavy snow over parts of Front Range foothills…urban corridor and Palmer Divide. Storms totals in the Front Range foothills included: 13.5 inches…6 miles southwest of Evergreen and near Genesee; 13 inches…3 miles northwest of Idledale; 12 inches…3 miles north of Conifer and near Kittredge; 11 inches…12 miles southwest of Boulder and 3 miles southeast of Indian Hills and at Strontia Springs dam; 10 inches near Bailey…Bergen Park and Crow Hill; 9.5 inches near Blackhawk and 4 miles east-northeast of Nederland. Across the urban corridor and Palmer Divide storm totals included: 12 inches at Highlands Ranch…11 inches…5 miles south-southwest of Arapahoe Park and Louviers; 10 inches…4 miles south of Denver; 9 inches near Englewood…Lakewood… And Wheat Ridge; 8 inches at Aurora and 3 miles south-southwest of Castle Pines; 7.5 inches…3 miles southeast of Denver; with 7 inches 2 miles north-northeast of Commerce City. At Denver International Airport…7.3 inches of snowfall was observed.

From the 14th to the 18th:

In 1964…the first measurable snowfall of the season totaled 6.0 inches at Stapleton International Airport where northeast winds gusted to 32 mph on the 14th. Most of the snow…4.2 inches…fell on the 14th. This was the only measurable snow of the month.

On the 15th:

In 1902…4.0 inches of snow fell over downtown Denver. This was the only measurable snow of the month. Northeast winds were sustained to 18 mph with gusts to 20 mph.

In 1906…strong winds howled and roared across Boulder… Causing several thousand dollars in damage. The strong winds caused one fatality and minor injuries to others. West winds were sustained to 46 mph in downtown Denver where the strong Chinook winds warmed the temperature to a high of 74 degrees.

In 1944…the low temperature dipped to 32 degrees. This is the latest date of the first freeze in Denver.

In 1949…a trace of rain fell. Another trace of rain on the 11th was the only precipitation of the month…making the month one of the driest Novembers on record and the least snowiest with no snow. This was the first November since 1882 without snow.

In 1960…strong winds caused 2 thousand dollars damage to a new school building in Boulder where wind gusts were estimated to 70 mph. Wind gusts to 40 mph were recorded in downtown Denver. Damage occurred to utility lines…signs… And trees. Northwest winds gusted to 44 mph at Stapleton Airport.

In 1986…strong Chinook winds howled over the Front Range foothills. The highest wind gust…81 mph…was recorded at Table Mesa in Boulder. West winds gusted to 31 mph at Stapleton International Airport.

In 1987…the first measurable snow of the season was also a major snowstorm. The snow combined with strong winds to close I-70 east of Denver and I-25 to Colorado Springs. Snow accumulations ranged from 6 to 9 inches across metro Denver with 10 to 20 inches in the foothills. At Stapleton International Airport…6.1 inches of snow fell and north winds gusted to 47 mph reducing the visibility to as low as 1/8 mile in heavy snow. Strong north winds at 20 to 30 mph with frequent gusts to 40 mph and temperatures hovering around 30 degrees plunged wind chill temperatures to 5 below zero.

In 1988…the season’s first snow storm hit metro Denver. The storm dumped 2 to 5 inches of snow…which caused numerous traffic snarls and accidents. North wind gusts to 43 mph caused some blowing snow. Snowfall totaled 2.5 inches at Stapleton International Airport. This was the latest first snow of the season. No traces of snow had occurred earlier in the season.

In 2010…the combination of light snow…wind… Black ice and careless driving resulted in a 34-vehicle crash along Interstate 25 north of Monument. Five tractor-trailers were involved in the pileup. Although there were no fatalities… 18 people were seriously injured and taken to nearby hospitals. The northbound lanes of I-25 were closed for several hours…snarling the traffic between Denver and Colorado Springs.

From the 15th to the 16th:

In 1894…winds behind an apparent strong cold front were sustained to 60 mph with gusts to 75 mph on the 15th. Snowfall totaled 2.6 inches in the city. Temperatures plunged from a high of 72 degrees on the 15th to a low of only 5 degrees on the 16th. The high temperature on the 16th was 24 degrees…which occurred shortly after midnight.

In 1996…around a foot of new snow fell in the foothills west of Denver with 3 to 6 inches at lower elevations across metro Denver. Some of the snowfall totals included: 15 inches at Georgetown…12 inches at Idaho Springs…10 inches at Chief Hosa…and 9 inches in Coal Creek Canyon. Snowfall totaled 2.9 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 23 mph at Denver International Airport on the 16th.

From the 15th to the 17th:

In 1991…a strong winter storm dumped heavy snow over metro Denver. Snowfall amounts totaled 15 inches at Castle Rock and conifer…14 inches at Morrison and Parker…12 inches in southeast Aurora…and 11.6 inches at Stapleton International Airport. Winds were light with the storm.

Continue reading November 15 to November 21: This week in Denver weather history →

Weather History

November 8 to November 14: This week in Denver weather history

November 8, 2015 Thornton Weather Leave a comment

Wind is always a factor on the plains and the fall usually brings a great deal of it, especially in November. Our look back at this week in Denver weather history shows that event and snow are quite common this time of year.

From the National Weather Service:

From the 7th to the 8th:

In 1969…wind gusts to 48 mph in downtown Boulder caused minor damage.

On the 8th:

In 1896…southwest Chinook winds sustained to 42 mph with gusts as high as 46 mph warmed the temperature to a high of 53 degrees.

In 1977 near-blizzard conditions in blowing snow caused the closure of I-70 to the west of Denver in clear creek canyon and east of Denver to Limon. Northeast wind gusts to 46 mph were recorded at Stapleton International Airport where snowfall totaled only 1.1 inches.

In 1984…a rare November thunderstorm produced west winds gusting to 31 mph…but only 0.04 inch of rain at Stapleton International Airport.

In 1996…high winds gusting from 80 to 100 mph were recorded at Wondervu in the foothills southwest of Boulder. West northwest winds gusted to 32 mph at Denver International Airport.

In 2006…the temperature in Denver climbed to a high of 80 degrees. This was the first time the temperature had ever exceeded the 70’s in November since records began in 1872. This new all-time record maximum temperature for the month of November was also a new daily record and the highest temperature ever recorded so late in the season.

From the 8th to the 9th:

In 1897…west winds were sustained to 45 mph with gusts as high as 50 mph in the city.

In 1919…post-frontal heavy snowfall totaled 8.4 inches over downtown Denver. Most of the snow…6.6 inches…fell on the 9th. North winds were sustained to 26 mph with gusts to 30 mph on the 8th.

In 1950…a major winter storm dumped 10.4 inches of snow at Stapleton Airport with the most snow…7.8 inches…falling on the 8th. East winds gusted to 31 mph at Stapleton Airport on the 8th. Snowfall totaled 8.2 inches in downtown Denver.

In 1958…strong winds caused some damage in Boulder. West- northwest winds gusted to 40 mph at Stapleton Airport on the 8th.

In 1975…heavy snowfall hit metro Denver. Snowfall at Stapleton International Airport totaled 8.0 inches and east winds gusted to 21 mph. Power outages caused by the storm affected over 10 thousand people in metro Denver. In the foothills west of Denver…10 to 15 inches of snow fell. The storm produced the greatest 24-hour precipitation…1.29 inches…ever recorded during the month of November in the city.

In 1983…metro Denver received 4 to 8 inches of snow with the heaviest amounts near the foothills. It was the first measurable snow of the season in Denver. Only 1.8 inches of snow fell at Stapleton International Airport where north winds gusted to 20 mph.

In 1989…strong winds hit the Front Range. On the 9th…the wooden frame of a house under construction in Boulder was blown down. The previous evening a power outage blackened Nederland. Wind gusts to 95 mph were recorded 4 miles south of Rollinsville with 97 mph on fritz peak near that town. At Stapleton International Airport…northwest winds gusted to 45 mph on the 8th and to 38 mph on the 9th.

In 1998…another upslope snow event developed in the Front Range foothills. The heaviest snowfall occurred in west central Jefferson County where 14 inches were measured 8 miles west of conifer. Other snowfall totals included: 10 inches at evergreen and 9 miles northwest of Bergen Park; 9 inches at Genesee…Nederland…and near the Chief Hosa exit on I-70; and 8 inches in Coal Creek Canyon. On the 9th…snowfall was 2.6 inches at the site of the former Stapleton International Airport. North-northeast winds gusted to 30 mph at Denver International Airport on the 9th.

From the 8th to the 10th:

In 1985…Indian summer came to an abrupt end when a winter storm dumped 10 to 18 inches of snow in the Front Range foothills and 6 to 10 inches across metro Denver…snarling traffic and causing flight delays of up to 3 hours at Stapleton International Airport. The temperature plunged from a high of 66 degrees on the 8th to a low of only 13 degrees on the 9th…after the passage of a vigorous cold front with northeast winds gusting to 32 mph. The temperature climbed to only 19 degrees on the 10th…setting a record low maximum for the date. Snowfall totaled 7.3 inches at Stapleton International Airport with most of the snow…7.1 inches…falling on the 9th.

On the 9th:

In 1939…a trace of snow fell over downtown Denver. This snow…along with a trace of snow on the 2nd…was the only snow of the month…ranking it…along with other months…the second least snowiest November on record. Precipitation of 0.01 inch was the only precipitation of the month…making this the second driest November on record.

In 1944…the first killing frost of the season occurred in the city when the low temperature dipped to 35 degrees. This is the latest date for a killing frost ever recorded in Denver.

In 1946…heavy snowfall totaled 7.7 inches over downtown Denver. This was the second heavy snowfall in less than a week. Northwest winds were sustained to 26 mph.

In 1995…strong downslope winds gusted between 50 and 57 mph at Erie and Boulder. West wind gusts to 44 mph were recorded at Denver International Airport.

In 2014…a record high min of 45 degrees… Broke the previous record of 43 degrees set in 1934…and preceded several days of record cold temperatures from the 11th through the 13th.

Continue reading November 8 to November 14: This week in Denver weather history →

Weather History

November 1 to November 7: This week in Denver weather history

November 1, 2015 Thornton Weather Leave a comment

As we enter Denver’s second snowiest month, we of course see plenty of events involving that dominant weather condition. Sadly we also see two occasions when the winter-like weather turned deadly.

From the National Weather Service:

From the 29th to the 1st:

In 1972…heavy snowfall totaled 15.5 inches at Stapleton International Airport. However…the heaviest snow occurred on Halloween night when 7 inches fell on trick-or-treaters during a short 3-hour period. I-25 was closed south of Denver. North winds gusting to 29 mph caused some blowing snow on the 1st. The snow started late on the 29th and ended during the mid afternoon on the 1st. The greatest snow depth on the ground at Stapleton International Airport was 13 inches on the 1st.

From the 31st to the 1st:

In 1951…6.4 inches of snowfall were measured at Stapleton Airport.

In 1989…a Halloween storm dropped 3 to 6 inches of snow on metro Denver with the adjacent foothills receiving 5 to 10 inches. Snowfall totaled 4.5 inches at Stapleton International Airport…where north winds gusted to 31 mph on the 31st. Most of the snow fell on the evening of the 31st…but the storm left icy streets throughout metro Denver on the morning of the 1st…making it a “spooky” commute for many motorists.

In 2004…heavy snow fell in and near the foothills of Jefferson and Douglas counties. Storm total snowfall included: 14.5 inches in Aspen Park…10 inches at Roxborough State Park and near Sedalia…8 inches near Bergen Park…and 7 inches in Highlands Ranch. Snowfall totaled only 3.2 inches in the Denver Stapleton area. Post-frontal northeast winds gusted to 41 mph at Denver International Airport.

On the 1st:

In 1896…northwest Chinook winds sustained to 40 mph with gusts to 46 mph warmed the temperature to a high of 60 degrees in the city.

In 1973…wind gusts to 92 mph were recorded in Boulder. West winds gusted to 41 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 70 degrees.

In 1989…a 39-year-old Lakewood man in a motorized wheelchair was found dead of exposure early in the morning after an overnight snowfall dumped 3 to 6 inches of snow across metro Denver.

From the 1st to the 2nd:

In 1892…snowfall totaled 5.0 inches in downtown Denver. This was the only snow of the month.

In 1956…heavy snowfall totaled 7.0 inches at Stapleton Airport. The storm was accompanied by much blowing and drifting snow. North winds gusted to 47 mph.

In 1991…the storm system which hit the Front Range at the end of October finished the job during the start of November. Six inches of new snow were recorded at both Rollinsville and Morrison…while 2.9 inches of snow fell at Stapleton International Airport where northeast winds gusted to 17 mph. The temperature climbed to a high of only 19 degrees on the 2nd…setting a record low maximum for the date.

In 1995…a winter storm dropped 5 to 8 inches of snow in the Front Range foothills. The exception was at Golden gate canyon where a foot of new snow was measured. Icy roads…fog…and blowing snow along I-70 in the foothills west of Denver caused dozens of accidents. One man was killed when he lost control of his vehicle and was ejected when his truck hit a median and rolled over. At least 20 other accidents involved minor injuries. Only 1.0 inch of snow fell at the site of the former Stapleton International Airport where some freezing rain also fell.

On the 2nd:

In 1939…a trace of snow fell over downtown Denver. This snow…along with a trace of snow on the 9th…was the only snow of the month…ranking it…along with other months…the second least snowiest November on record.

In 1967…post-cold frontal heavy snowfall totaled 6.2 inches at Stapleton International Airport where north winds gusted to 29 mph…briefly reducing the visibility to 1/8 mile.

In 1992…the first major snowfall of the season dumped 4.6 inches of snow at Stapleton International Airport where north winds gusted to 26 mph. Heavier amounts of snow fell in and near the foothills with 8 inches at Conifer… Empire…and bailey…6 inches at Rollinsville and Golden Gate Canyon…and 4 inches at Morrison and Wheat Ridge.

In 2011…a storm system brought another around of moderate to heavy snow to the region. Areas in and near the Front Range foothills and palmer divide were hit the hardest. Gusty winds also produced blizzard conditions at times along the Palmer Divide. In addition…the snow and blowing snow forced several school closures in Douglas and Weld counties. Snow drifts…from 1 to 3 feet deep were reported in the northern portion of Douglas and Elbert counties. Storm totals included: 14 inches…4 miles south of Boulder and 12.5 miles northwest of Golden…13 inches… 5 miles east-southeast of Aspen Springs; 12 inches near Allenspark and Parker; 11 inches…6 miles southwest of Castle Rock…Genesee… 9 miles north-northeast of Elizabeth…10 inches… 10 miles south-southeast of Buckley AFB. At the National Weather Service in Boulder… 7.9 inches of snow was recorded…with 4.5 inches observed at Denver International Airport.

From the 2nd to the 3rd:

In 1974…heavy snowfall totaled 6.1 inches at Stapleton International Airport where north winds gusted to 23 mph on the 3rd. Most of the snow fell on the 3rd. Maximum snow depth on the ground was 5 inches.

In 1990…a winter storm dumped 3 to 8 inches of heavy wet snow across metro Denver. In the foothills snow amounts ranged from 4 to 10 inches. Slushy snow and ice-covered roads snarled traffic. The snow…ice…and poor visibilities were blamed for numerous traffic accidents. Low clouds… Fog…and snow delayed air traffic at Stapleton International Airport for at least 90 minutes on the afternoon of the 2nd. Snowfall totaled 5.4 inches at Stapleton International Airport where north winds gusted to 21 mph.

Continue reading November 1 to November 7: This week in Denver weather history →

Thornton Weather

September 28 to October 5: This Week in Denver Weather History

October 3, 2013 Thornton Weather Leave a comment

While it appears Denver will escape September snow, our look back at this week in weather history shows that isn’t always the case. Additionally, while not common, even early fall can bring severe weather with damaging wind, lightning and even tornadoes.

From the National Weather Service:

28-29

In 1959…one of the heaviest September snow storms of record began as rain and changed to heavy wet snow. The storm caused heavy damage to trees and shrubbery…which were still in full leaf. The storm dumped 10.6 inches of snow at Stapleton Airport…the third heaviest September snow amount to date. Falling trees and limbs disrupted traffic…broke power and communication lines…and damaged buildings and cars. One man was killed in Denver by a falling tree limb…and four others died of heart attacks while shoveling snow or trying to move heavy tree limbs. Direct costs of the storm for cleaning up debris…repairing utility lines…and damage to buildings and other property across all of eastern Colorado were estimated to be over a half million dollars. The value of trees destroyed or damaged was estimated to exceed five million dollars. North-northeast winds gusted to 32 mph at Stapleton Airport on the 28th.

In 1985…an unusually cold air mass for this time of year settled over the area. Metro Denver received 8 to 12 inches of powdery snow. The 8.7 inches of snow that fell at Stapleton International Airport was the first measurable snow of the season and the city’s heaviest September snowfall since 1971. The snow caused flight delays of over 2 hours at Stapleton International Airport. I-70 was closed for a time west of Denver. Snow-laden tree limbs snapped over all of metro Denver…causing widespread power outages. Ten thousand people were without electricity for a time in Boulder. The morning of the 29th saw mid-winter temperatures along the Front Range. The temperature dipped to 17 degrees…the lowest temperature ever recorded in September in Denver. The high temperature of only 29 degrees on the 29th was a new record low maximum for the date and lowest ever recorded during the month of September. The low temperature of 21 degrees on the evening of the 28th set a new record low for the date. The cold weather persisted through the 1st with record minimum temperatures of 25 degrees set on the 30th and 27 degrees set on October 1st.

In 1966…a vigorous cold front moved thru metro Denver. North winds gusting to 51 mph kicked up billows of blowing dust…which briefly reduced the visibility to 1 mile at Stapleton International Airport. The cold air caused temperatures to drop rapidly from a high of 86 degrees to a low of 46 degrees by days end.

In 1985…the lowest temperature ever recorded in September… 17 degrees…occurred. The high temperature warmed to only 29 degrees…the all-time record low maximum for the month.

In 1994…the temperature reached a high of 91 degrees at Stapleton International Airport. This was the 60th day of the year that the temperature had reached 90 degrees or more…establishing a new record at that time. The previous record of 52 “90 degree days” occurred in 1978. Only 43 “90 degree days” were recorded at Denver International Airport during 1994.

In 1995…lightning struck a couple in Aurora as they were walking in the rain. The bolt struck the umbrella the man was carrying…injuring both the man and his wife.

In 2000…late afternoon thunderstorms produced strong wind gusts to 76 mph in Westminster…to 69 mph near Boulder…and to 60 mph at Jefferson County Airport near Broomfield. No damage was reported.

In 1898…south winds were sustained to 41 mph with gusts to 54 mph.

In 1940…a late season thunderstorm in the city caused one lightning death.

In 1944…the month ended with a trace of rain on this date and for the month. A trace of rain also occurred on the 4th…9th…and 10th. There was no measurable precipitation for the month. The total of a trace of precipitation for the month equaled the driest September on record first set in 1892.

In 2009…a trained spotter in Coal Creek Canyon…recorded a peak wind gust to 88 mph.

Continue reading September 28 to October 5: This Week in Denver Weather History →

Weather History

May 19 to May 25: This Week in Denver Weather History

May 20, 2013 Thornton Weather Leave a comment

Severe weather takes to the forefront in our look back at this week in Denver weather history. We see many historical flooding events that were commonplace in the late 19th / early 20th century before controls were put in place. Almost everyone will recall the Windsor tornado, an EF3 monster that struck the town five years ago.

From the National Weather Service:

18-19

In 2011…a severe thunderstorm in central Adams County produced large hail and heavy rainfall on the 18th. Large hail from 1 inch to 1 3/4 inches in diameter…was reported in Commerce City…2 miles south-southeast of federal heights…Northglenn…and 2 miles south of Thornton.

In Commerce City…the storm uprooted trees and knocked out power lines. A carport was lifted off the ground and struck the power lines overhead. Heavy rain…from 1.0 to 1.5 inches fell in less than 2 hours in Commerce City and near Brighton. The combination of hail and strong winds broke windows in Northglenn.

In the foothills…moderate to heavy snow showers developed overnight. Storm totals included: 10.5 inches at Gold Hill…9.5 inches…3 miles west of Jamestown; 9 inches at Lake Eldora; with 6 inches… 11 miles southwest of Gilpin and 4 miles east-northeast of Nederland. At Denver International Airport…total rainfall over the 2-day period totaled 1.71 inches.

In addition…a peak wind gust to 37 mph was recorded on the 18th.

18-20

In 1915…3.9 inches of snow fell in the city. The estimated amount of snow that melted as it fell was 6.2 inches which would have totaled an estimated 10.1 inches of snowfall. Precipitation totaled 1.03 inches. North winds were sustained to 32 mph on the 18th. Low temperatures dipped to 25 degrees on both the 18th and 20th…establishing record minimums for both dates.

In 1988…prolonged heavy rainfall drenched metro Denver. The event began when heavy thunderstorms on the 18th caused some street flooding and power outages…followed by steady rain on the 19th and 20th. Rain amounts across metro Denver totaled 3 to 4 inches. Rainfall totaled 3.71 inches at Stapleton International Airport where north winds gusted to 39 mph on the 20th. Four to eight inches of snow fell in the foothills above 7 thousand feet.

In 1927…southeast winds were sustained to 40 mph with gusts to 44 mph.

In 1956…a thunderstorm wind gust to 54 mph was recorded at Stapleton International Airport.

In 1969…hail stones to 1 inch in diameter were measured in Arvada and Aurora. Some minor damage was reported. Pea to marble size hail fell in Westminster.

In 1972…a tornado was reported by aircraft about 5 to 10 miles east of Parker.

In 1988…lightning started a fire at a house in the Denver suburb of greenwood village…causing 2 thousand dollars in damage.

In 1991…strong thunderstorms over east metro Denver produced wind gusts of 56 to 60 mph. The strong winds downed power lines…trees…and fences at some locations in Aurora. Thunderstorm outflow winds gusted to 60 mph at Stapleton International Airport.

In 1994…severe thunderstorms rumbled across metro Denver. The storms produced wind gusts averaging 65 mph and hail up to dime size. Wind gusts to 77 mph were recorded in Brighton. Numerous trees and power poles were downed by the winds. One power pole fell onto spectators at a high school graduation ceremony in Commerce City…injuring 6 people. In Fort Lupton…trees fell onto 2 parked cars… Knocking out the windshields. Hail to 3/4 inch in diameter was reported in Littleton. A thunderstorm wind gust to 52 mph was recorded at Stapleton International Airport.

In 1995…a slow moving tornado…which was mainly discernible by its dust and debris cloud…was spotted 2 miles northeast of Denver International Airport or about 10 miles northwest of Bennett. No damage was reported.

In 2007…lightning struck a 33-ft statue of Jesus at Mother Cabrini Shrine…in the foothills west of Golden. The blast broke off one of the statue’s arms and a hand…and also damaged a foot. It cost an estimated $200000 to repair.

In 2009…lightning struck the roof of a residence in Highlands Ranch. The home was not a total loss…but the fire caused extensive damage.

In 2010…a thunderstorm produced hail up to 7/8 inch in diameter in Thornton.

19-20

In 1864…a devastating major flash flood occurred on the normally dry and sandy Cherry Creek in Denver. The flood was caused by heavy thunderstorm rainfall and hail over the palmer ridge to the south of the city in both the Cherry Creek and plum creek basins. Nineteen deaths occurred along the South Platte River and Cherry Creek in Denver. The torrent swept cattle and sheep along with large trees and houses before it washing out several bridges…and moving large structures from their foundations. All city records were destroyed when city hall washed away. The rocky mountain news building…built on stilts in the middle of the creek…was totally destroyed by the raging waters…which were as deep as 5 feet on the morning of the 20th. Once the flood waters receded…much sand and gravel was left behind. Property damage from the flood was estimated at nearly one million dollars. This was the first major flood of record in the city.

Continue reading May 19 to May 25: This Week in Denver Weather History →

Weather History

May 12 to May 18: This Week in Denver Weather History

May 14, 2013 Thornton Weather Leave a comment

The snow is gone – almost – but as our look back at this week in Denver weather history shows, it could return. That however is unlikely and more typical spring severe weather is far more common.

From the National Weather Service:

10-12

In 2011…a spring snowstorm brought heavy snow to the Front Range foothills and Palmer Divide. Storm totals included: 18 inches…4 miles south-southeast of Pinecliffe; 16 inches in Coal Creek Canyon; 15 inches…4 miles west-southwest of Eldorado Springs; 13 inches at Gold Hill…12 inches…4 miles west-southwest of Conifer and 4 miles northwest of Elizabeth; 11.5 inches…6 miles southwest of Evergreen and 4 miles east-northeast of Nederland; 11 inches…3 miles east of Jamestown and 10.5 inches…3 miles east of Franktown and 3 miles south of Golden and 10 inches…10 miles north of Elizabeth. At Denver International Airport… 1 inch of snowfall was observed.

In 1875…two forest fires on the eastern slope of the foothills were visible from the city.

In 1904…north winds were sustained to 40 mph with gusts to 48 mph.

In 1950…brilliant and complete primary and secondary rainbows arching across the sky were observed from Stapleton Airport.

In 1951…a wind gust to 51 mph was recorded at Stapleton Airport.

In 1984…winds gusted to 69 mph in Boulder. Northwest winds gusted to 47 mph at Stapleton International Airport.

In 1987…a small weak tornado touched down for about 2 minutes in southeast Denver. The twister hit a car dealership…blowing about a dozen windows out of cars and shattering four skylights on the building. Some tin roofing was blown off a patio a block and a half away. The tornado also downed a power pole. Damage at the dealership was estimated at 10 thousand dollars. A man was slightly injured by lightning in northwest Aurora.

In 1995…several funnel clouds were sighted near Parker. One of the funnels produced a short-lived debris cloud on the ground in an open field. No damage was reported.

12-13

In 1907…the temperature warmed to a high of 73 degrees on the 12th…before a cold front produced a thunderstorm… Northeast winds sustained to 40 mph…and rain changing to light snow overnight. Snowfall totaled only 2 inches…but the high temperature on the 13th was only 39 degrees.

In 1961…a storm that covered metro Denver with rain and snow started as thunderstorms on the evening of the 12th. Hail to 1 1/2 inches in diameter was reported 10 miles northwest of Stapleton Airport. Rain continued overnight and changed to snow on the 13th. Snowfall totaled 6.4 inches and precipitation (rain and melted snow) 1.96 inches at Stapleton Airport where north winds gusted to 39 mph. The rain and heavy wet snow caused icing damage to utility lines. Heavy snow occurred in the foothills.

In 1982…a major storm dumped 1.50 to 3.50 inches of rain across northeast Colorado and deposited prodigious amounts of snow in the foothills. Coal Creek Canyon southwest of Boulder was buried under 46 inches of snow with 39 inches at Nederland. The heavy wet snow downed many power lines in the foothills. In Thornton…the roof of a school was damaged by water from the heavy rain. At Stapleton International Airport…1.49 inches of rain were measured over the two day period. The heavy rain ended a severe and prolonged drought.

In 2004…a winter storm produced heavy snow in excess of a foot in the foothills above 6 thousand feet while heavy rain fell across the city. The heaviest snow occurred in the high country of Boulder County. Storm total snowfall was 14.5 inches near Jamestown. Rainfall totaled 0.81 inch at Denver International Airport with 0.94 inch recorded at Denver Stapleton. A trace of snow was recorded at both locations. East winds gusted to 24 mph at Denver International Airport on the 12th.

In 1905…a thunderstorm produced hail during the late afternoon. Precipitation totaled 0.57 inch.

13-14

In 1912…heavy snowfall totaled 12.4 inches over the city. Most of the snow…9.9 inches…fell on the 13th…which was the greatest 24 hour snowfall in May at the time. This was the last snowfall of the season. The low temperature dipped to 27 degrees on the morning of the 14th.

In 1989…a spring storm brought heavy rain and snow to the foothills. Metro Denver was soaked with 1 to 2 inches of rain. Rainfall totaled 1.26 inches at Stapleton International Airport.

In the foothills…Echo Lake received 20 inches of snow. A 30-ton Boulder slid onto I-70 east of the Eisenhower Tunnel…closing the freeway for 2 hours.

Continue reading May 12 to May 18: This Week in Denver Weather History →

Weather History

May 5 to May 11: This Week in Denver Weather History

May 9, 2013 Thornton Weather Leave a comment

This time of year the focus is usually on spring severe weather with lightning, tornadoes and hail being the highlight. Our look back at this week in Denver weather history shows many of those types of events. Also notable are the few, unusually late in the season snow events, some of which were quite heavy.

From the National Weather Service:

1-5

In 1898…snowfall totaled 15.5 inches in downtown Denver. Most of the snow…6.2 inches…fell on the 3rd. Most of the snow melted as it fell. The greatest snow depth on the ground was only 2.5 inches on the 3rd at 8:00 pm. This was the only snowfall during the month. Northeast winds were sustained to 22 mph on the 1st.

2-5

In 2001…a very slow moving pacific storm system became parked near the four corners region…which allowed heavy snow to develop above 6500 feet in the foothills with a mix of rain and snow over lower elevations of metro Denver. Snowfall totals included: 21 inches atop Crow Hill and at Idaho Springs; 19 inches near Blackhawk; and 18 inches in Coal Creek Canyon…Genesee…and 11 miles southwest of Morrison. Snowfall totaled 6.2 inches at the site of the former Stapleton International Airport. Precipitation (rain and melted snow) totaled 2.09 inches at Denver International Airport where north winds gusted to 30 mph on the 2nd.

3-5

In 1908…rain changed to snow on the evening of the 3rd and continued through the early evening of the 5th. Snowfall totaled 10.0 inches over downtown Denver. This was the last measurable snow of the season. Precipitation totaled 1.51 inches. North winds were sustained to 23 mph on the 3rd…33 mph on the 4th…and 21 mph on the 5th. Three temperature records were set. High temperatures of 30 degrees on the 4th and 38 degrees on the 5th were record low maximum temperatures for the dates. The reading on the 4th was also the all-time record low maximum for the month of May.

In 2007…a slow moving pacific storm system…from the desert southwest…brought a period of unsettled weather to the region. During the 3-day period…locally heavy snow was reported over parts of the Front Range foothills. Storm totals included: 15 inches near Conifer…14.5 inches west of Jamestown…13.5 inches; 6 miles southwest of Evergreen…and 12.5 inches at pine junction. Severe thunderstorms…producing large hail…up to one inch in diameter were observed in the vicinity of Boulder and Hudson. Lightning struck a residence in Jefferson County. The roof was hit…causing the attic to catch fire. At Denver International Airport…lightning struck a United Airlines jet as it was pushing away from the gate. The passengers were taken off the jet and put on another plane.

4-5

In 1986…high winds buffeted the foothills. Wind speeds of 60 to 75 mph were recorded in Boulder. At Stapleton International Airport…west winds gusted to 45 mph on the 4th and to 40 mph on the 5th.

In 2000…a brief warm spell resulted in setting two daily high temperature records. The temperature climbed to highs of 87 degrees on the 4th and 89 degrees on the 5th.

4-8

In 1969…heavy rains caused flooding on Boulder creek in Boulder…which resulted in one death on the 7th. Flooding also occurred on bear creek in Sheridan and on the South Platte River in Denver. Rain over most of the eastern foothills started late on the 4th and continued with only brief interruptions in many areas until the morning of the 8th. Very high rates of rainfall occurred on the 6th and 7th with the greatest intensities in a band along the foothills from about 25 miles southwest of Denver northward to Estes Park. Storm totals by both official and unofficial measurements exceeded 10 inches over much of this area and were over 12 inches in some localities. Heavy snow fell in the higher mountains and in the foothills later in the period. The saturation of the soil resulted in numerous rock and landslides…and the heavy run-off caused severe damage along many streams and flooding on the South Platte River. Many foothill communities were isolated as highways were blocked and communications disrupted. Roads were severely damaged over a wide area…and a large number of bridges washed out. Many roads were closed due to the danger from falling rocks. A building in Georgetown collapsed from the weight of heavy wet snow. In Boulder…a man drowned when caught by the flooding waters of Boulder Creek…and a patrolman was injured. Rainfall totaled 7.60 inches in Boulder with 9.34 inches recorded at the Public Service Company electric plant in Boulder Canyon. In Morrison…rainfall totaled 11.27 inches in 4 days. Heavy rainfall totaled 4.68 inches at Stapleton International Airport over 3 days from the 5th through the 7th. Rainfall of 3.14 inches was recorded in 24 hours on the 6th and 7th. Downstream flooding continued along the South Platte River until the 12th when the flood crest reached the Nebraska line.

In 1903…apparent post-frontal northeast winds were sustained to 48 mph with gusts to 60 mph.

In 1950…a northwest wind gust to 52 mph was recorded at Stapleton Airport.

In 1969…a funnel cloud was observed for 2 to 3 minutes just north of Parker. Two other funnel clouds were sighted in the same area. The public sighted a tornado 15 miles east of Stapleton International Airport. No damage was reported.

5-6

In 1907…rain changed to snow on the 5th…continued through the night…and totaled 3.50 inches. Northeast winds were sustained to 15 mph on the 5th.

In 1917…post-frontal rain changed to heavy snow and totaled 12.5 inches over downtown Denver. Most of the snow… 12.0 inches…fell on the 5th and this was the greatest 24-hour snowfall ever measured during the month of May. This was also the only measurable snow of the month that year. Low temperatures of 27 degrees on the 5th and 23 degrees on the 6th were record minimums for the dates. High temperatures on both days were in the lower 40’s. Southeast winds were sustained to 24 mph with an extreme velocity to 26 mph.

In 1964…high winds gusted to 54 mph in Boulder and to 80 mph at Jefferson County Airport near Broomfield. Wind gusts of 50 to 60 mph were common over all of eastern Colorado. Buildings…power lines…trees…and vehicles were damaged by the wind. South-southwest wind gusts to 54 mph caused some blowing dust at Stapleton International Airport where the visibility was briefly reduced to 2 miles.

In 1973…a heavy driving rain storm with embedded thunderstorms…produced 1 to 5 inches of rain and caused local flash flooding along the east slopes of the Front Range. The greatest flash flooding occurred in metro Denver where rainfall totaled 3.56 inches at Stapleton International Airport. Flooding in metro Denver occurred on Clear Creek and the South Platte River…already swollen from heavy snowmelt. Numerous basements were flooded… Roads and streets were washed out…a bridge was demolished… And miscellaneous other damage was reported. North winds gusted to 39 mph at Stapleton International Airport during the storm. The storm produced major downstream flooding along the South Platte River all the way to the Nebraska border during the next two weeks. One person died and total damage was estimated at around 120 million dollars.

In 1978…heavy wet snow of around 24 inches collapsed an office and hotel building in Boulder. Many cars were abandoned in the city. Denver received 14 inches of heavy wet snow with Evergreen and Golden reporting 12 inches. Snowfall totaled 12.4 inches at Stapleton International Airport with a total accumulation of snow on the ground of 8 inches due to melting. Southeast winds gusted to 23 mph on the 5th. Temperatures both days remained in the lower to mid-30’s.

Continue reading May 5 to May 11: This Week in Denver Weather History →

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