Spring severe weather takes a front seat in our look back at this week in Denver weather. There are flooding rains, tornadoes and many occurrences of people being hurt or killed by lightning.

From the National Weather Service:

18-26

In 2023…smoke and haze from massive wildfires in Canada significantly impacted air quality and visibility across Denver and the rest of northeast Colorado.

20-27

In 2002…lightning sparked a wildfire near Deckers. Extremely dry conditions and very strong winds the following day allowed the fire…known as the Schoonover…to consume 3850 acres before it could be contained. Thirteen structures were destroyed…including 4 homes…resulting in 2.2 million dollars in damage.

24-26

In 1996…a late spring snowstorm dumped 4 to 10 inches of snow over the Front Range foothills. Conifer picked up 10 inches of new snow; Aspen Springs…9 inches; and central city…8 inches. The sticky…heavy snow clung to power lines and pulled tree branches down…causing power outages to about 1200 homes in the Conifer area. It took up to 6 hours to restore power to some residences. Lightning struck a telephone data cabinet in Conifer on the 25th…which knocked out phone service to about 1500 customers. Widespread rain fell across metro Denver… Where rainfall totaled 2.07 inches at the site of the former Stapleton International Airport and 1.66 inches at Denver International Airport where north winds gusted to 24 mph on the 26th.

In 2010…high winds preceding a cold front…swept across the Front Range foothills and urban corridor. In Aurora… The wind damaged the roof of Rangeview High School. In Conifer and Denver…the wind downed trees and power lines and caused several brief outages. The downed power lines also caused several cars to catch fire in the vicinity of 1590 Cook St. in Denver. Peak wind gusts included: 82 mph at Highlands Ranch…67 mph…4 miles east of Franktown and Longmont; 65 mph in Boulder…64 mph in Centennial and Denver International Airport…62 mph near Parker and 60 mph in Arvada.

25

In 1877…lightning killed one person in west Denver and struck several houses. The bolt struck the house of the “home laundry” stunning the occupants and killing a lady who was holding one of her grandchildren in her arms. The child escaped unhurt. The lightning also struck the top of a tree in front of the house and partially peeled the bark off the tree. Lightning struck a church in the Evans addition and another tree in east Denver. Lightning struck the switch room at the telegraph office where the operator saw small balls of lightning pass across the room to the stove. The thunderstorm pelted the city with only pea size hail. Precipitation from the storm totaled 0.40 inch in downtown Denver.

In 1880…light rain all afternoon totaled only 0.24 inch in the city…but was valuable to stockmen and farmers due to the very dry…parched weather conditions on the plains.

In 1965…a tornado was sighted by a pilot 30 miles south southeast of Denver. No damage was reported. Another pilot reported 3/4 inch hail 30 miles east of Denver. The state patrol reported that a man was killed when a fierce gust of wind swept him from the back of a pick-up truck in northwest Douglas County. The man was holding a mattress in the bed of the truck.

In 1974…a microburst wind gust to 53 mph was recorded at Stapleton International Airport. A pilot reported a tornado 20 miles east of Denver.

In 1976…lightning struck a home in Boulder…shattering 2 large trees and damaging a television set.

In 1997…hail as large as 1 3/4 inches in diameter fell near Watkins. Hail to 3/4 inch in diameter fell in Broomfield and near Lochbuie.

In 2000…3/4 inch diameter hail fell at Cheery Creek Reservoir in Aurora. Thunderstorm winds gusted to 51 mph at Denver International Airport where small hail fell.

In 2006…a severe thunderstorm produced an estimated wind gust to 70 mph in Hudson. The strong winds damaged the roof of a home. A thunderstorm produced southwest wind gusts to 54 mph at Denver International Airport.

25-26

In 1950…a major storm dumped 10.0 inches of snowfall downtown and 10.7 inches at Stapleton Airport where northwest winds gusted to 30 mph on the 25th. The storm caused extensive damage to utility wires and trees which were in full leaf. A daily record minimum temperature of 31 degrees occurred on the 25th. This was the coldest temperature on this date in 79 years and for so late in the season.

In 1989…a late season snow storm dropped snow as low as 6 thousand feet along the Front Range. Most places in the foothills had 2 to 5 inches of snow. Overnight rainfall totaled 0.33 inch at Stapleton International Airport where north winds gusted to 37 mph on the 25th.

In 1994…lightning struck a television transmitter on Lookout Mountain near Golden and burned out a switcher…which disrupted cable service for 2 hours.

26

In 1897…apparent post-frontal north winds were sustained to 42 mph with gusts as high as 48 mph.

In 1942…the all-time highest recorded temperature in May…95 degrees…occurred.

In 1978…two children were struck and killed by lightning on a junior high school playground in Parker.

In 1987…1 inch diameter hail fell near Boulder and Bennett. The hail was fairly soft and caused no damage.

In 1993…dry thunderstorms produced wind gusts to 81 mph at Jefferson County Airport near Broomfield. Several trees were blown down by the strong winds. Microburst winds gusted to 51 mph at Stapleton International Airport.

In 1995…a woman was injured in Littleton when the car she had just entered was struck by lightning. All of the windows in the car were blown out by the strike. A funnel cloud was sighted near Littleton.

In 2000…a strong microburst wind gust to 92 mph flipped a small airplane on its back and blew a dc-3 loose from its moorings…which allowed it to roll onto a grassy field at Front Range airport near Watkins.

In 2010…severe thunderstorms pounded parts of the urban corridor with very large hail…heavy rain…damaging winds and a tornado. The hail…ranging in size from 1 inch to 2 3/4 inches in diameter…struck Brighton…Commerce City and northeast Denver the hardest. The storms continued to spread destruction to the north and east…impacting byers…Hudson…Deer Trail and Prospect Valley. The combination of hail and wind stripped the bark and branches from trees. Numerous accidents were reported as the hail accumulated up to a foot deep. Snowplows were called out to clear the roadways. Flash flooding occurred along State Highway 52 between Hudson and Keenesburg…and forcing the closure of the highway. Widespread crop damage was also reported as the area was inundated with up to 18 inches of water. Extensive damage to homes…businesses and automobiles was reported with the damage estimated to be around 70 million dollars. A tornado touched down near Denver International Airport…but did no damage. Lightning struck a child in Commerce City while she was watching television. She suffered minor injuries to her leg. At the Rocky Mountain Arsenal Wildlife Refuge…a lightning strike killed a bison. At Denver International Airport…only 0.01 inch of rainfall was observed…along with a peak wind gust to 48 mph from the southeast.

In 2016…severe thunderstorms produced hail up to one inch in diameter near Castle Rock…The Pinery and Watkins.

In 2019…severe thunderstorms broke out across parts of Adams…Arapahoe…Denver…and southern Weld counties during the late afternoon and early evening. The hail ranged from 1 to 1 1/2 inch in diameter. At Denver International Airport…up to 3 inches of hail accumulated on runway surfaces. Consequently…dozens of flights were either delayed or cancelled so runways could be cleared and aircraft inspected for hail damage. A peak wind gust to 44 mph was observed from the west at Denver International Airport…with 0.65 inch of rainfall.

Continue reading May 25 to May 31: This Week in Denver Weather History →

The further we get into May, the chances for severe weather increase. This is readily seen in our look back at this week in Denver weather history. The majority of the events involve springtime severe weather like heavy rains that result in flooding, large damaging hail, dangerous lightning and an increase in tornadoes.

From the National Weather Service:

14-18

In 1996…a period of unusually warm weather resulted in 4 record maximum temperatures in 5 days. The record high temperatures were 87 degrees on the 14th…89 degrees on the 15th…and 93 degrees on both the 16th and 18th. The temperature climbed to only 81 degrees on the 17th which was not a record.

17-19

In 2017…a strong spring storm dropped across the Great Basin… and then moved eastward across Colorado. Isolated but strong thunderstorms preceded the system on the 17th with hail up to nickel size near Boulder Airport and Brighton. Significant snow fell across the Front Range mountains and foothills over the next couple of days. Along the Interstate 25 Corridor… rain turned to snow on the morning of the 18th…heaviest from around Broomfield northward. The heavy wet snow snapped the limbs of fully leaved trees and caused scattered power outages. A barns collapsed in northeast Loveland. Fifty-five head of cattle were inside the collapsed barn; three were injured and later euthanized. Numerous branches and trees snapped in the foothills. Elsewhere…several scattered smaller power outages were reported. Three to nearly five inches of liquid precipitation occurred…as rain or a mix of rain and snow…fell around Greeley. Storm totals in the Front Range mountains and foothills included: 42.0 inches near Allenspark…41.5 inches near Ward…36 inches at Estes Park… 32 inches near Pinecliffe…30.5 inches northwest of Golden… 30 inches near Nederland…26 inches near Breckenridge…25 inches near Aspen Springs and Bear Lake State Park…14 inches at Aspen Springs…with 9.5 inches near Evergreen. On the west side of the Interstate 25 Corridor…storm totals included: 10 inches near Superior and Louisville…6 to 8 inches in and around Fort Collins…6 inches in Lafayette… 5 inches in Broomfield and Loveland…and 4 inches near Niwot.

18

In 1864…heavy rains combined with melting snow to cause much flooding on north clear creek in Blackhawk. Many bridges on the road to Denver were washed away by the high water on clear creek.

In 1893…northwest winds were sustained to 56 mph with an extreme velocity to 60 mph.

In 1960…large hail to 1 inch in diameter damaged roofs and cars in metro Denver. Heavy snow and rain in the foothills caused rock and landslides…which blocked some highways. There was widespread minor damage from lightning. Hail as large as 1 1/8 inch in diameter was measured at Stapleton Airport where winds gusted to 44 mph.

In 1975…a tornado touched down briefly just south of Buckley Field in Aurora. A few minutes later the same tornado touched down in open country 8 miles northeast of Stapleton International Airport. No damage was reported.

In 1985…3/4 inch hail fell just southeast of Aurora.

In 1988…lightning started a fire at a home in the foothills west of Boulder…causing 50 thousand dollars in damage.

In 1995…strong thunderstorms rumbled across metro Denver dropping mainly pea to marble size hail. However…hail stones as large as 1 1/4 inches in diameter fell in Wheat Ridge and downtown Denver. Hail piled up to 2 inches deep in Wheat Ridge and northwest Denver.

In 1996…the Buffalo Creek Wildfire started and spread rapidly on strong southwest winds at 20 to 30 mph. Dry weather conditions contributed to the spread of the fire… Which burned nearly 12 thousand acres and destroyed 12 structures including some houses.

In 2001…a 19-year-old man was struck and killed by lightning as he was walking along the shoulder of U.S. Highway 36 in Westminster.

In 2003…hail to 3/4 inch in diameter was measured at Denver International Airport.

In 2010…a small tornado touched down near Firestone but did no damage.

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.

18-26

In 2023…smoke and haze from massive wildfires in Canada significantly impacted air quality and visibility across Denver and the rest of northeast Colorado.

19

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.

Continue reading May 18 to May 24: This Week in Denver Weather History →

Damaging wind and hail, tornadoes, heavy snow and flooding rains are just a few of the significant events that have occurred during this week in Denver weather history.

From the National Weather Service:

10-11

In 1918…post-frontal snowfall totaled 4.7 inches in downtown Denver. Northwest winds gusted to 19 mph on the 10th.

In 1923…winds were strong and gusty on both days. Northwest winds were sustained to 40 mph with gusts to 44 mph on the 10th. North winds were sustained to 39 mph with gusts to 46 mph behind an apparent cold front on the 11th.

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 2023…a slow moving storm system produced a period of moderate to heavy rainfall across the urban corridor…Palmer Divide and adjacent plains. A 24-hr daily record of 2.92 inches occurred at Denver International Airport on the 11th…with a 2-day total of 3.75 inches on the 11-12th…and 3-day total of 4.40 inches from the 10-12th. The prolonged period of rainfall resulted in flooding…flash flooding and washed out roadways… including Cherry Creek State Park and the National Wildlife Refuge at the Rocky Mountain Arsenal. Three-day rainfall amounts south and southeast of Denver ranged from 4.00 to 7.00 inches. In the Front Range west of Denver…above 10 thousand feet…heavy wet snowfall ranged from 1 to 2 feet. The 3-day event propelled Denver into 4th place for rainfall in month of May…with a total of 5.53 inches.

11

In 1879…an apparent cold front during the afternoon produced sustained north winds as high as 60 mph and great clouds of blowing dust. The dust filled the air until the thunderstorm rain began…which produced 1.46 inches of rainfall. The rain ended during the evening.

In 1900…southwest winds were sustained to 40 mph with gusts to 46 mph.

In 1958…a microburst caused a brief wind gust to 55 mph at Stapleton Airport.

In 1963…south-southwest winds gusted to 48 mph at Stapleton Airport. Winds May have been stronger over west Denver where some buildings were damaged.

In 1998…large hail fell over south metro Denver. Hail as large as 1 1/4 inches in diameter was measured in Parker with 1 inch hail recorded in Littleton and 4 miles south of Lakewood in Jefferson County. Hail to 3/4 inch diameter was measured in Douglas County…11 miles west- northwest of Parker.

11-12

In 2014…from the 11th to the 12th…a strong storm system moved from southwest Colorado and produced heavy snow in and near the Front Range Foothills and metro Denver. The snow was heaviest in the foothills where up to 2 1/2 feet of snow was observed. In the foothills…storm totals included: 30 inches near Pinecliffe; 29 inches… 8 miles northeast of Four Corners; 28 inches near Pingree Park; 27 inches near Allenspark; 20.5 inches near Idaho Springs; 19.5 inches at Gold Hill; 19 inches near Genesee; 18 inches near Blackhawk; 17 inches at Aspen Springs; 16.5 inches near Ward; 13.5 inches at Bergen Park; with 11 inches at Evergreen. Along Urban Corridor and Palmer Divide…storm totals included: 10.5 inches at Eldorado Springs; 10 inches at Ken Caryl; 9 inches at Superior; 8 inches near Morrison; 7.5 inches in Broomfield and Highlands Ranch; 7 inches in Denver… near Franktown…Golden…Lakewood and Highlands Ranch; 6 inches…5 miles northeast of Westminster…7 miles south of Lyons and near Parker; with 5.5 inches at Aurora. At Denver International Airport…1.1 inches of snowfall was observed… along with 0.9 inches of water.

In 2023…a slow moving storm system produced a period of moderate to heavy rainfall across the urban corridor…Palmer Divide and adjacent plains. A 24-hr daily record of 2.92 inches occurred at Denver International Airport on the 11th…with a 2-day total of 3.75 inches on the 11-12th. The prolonged period of rainfall resulted in flooding…flash flooding and washed out roadways; including Cherry Creek State Park and the National Wildlife Refuge at the Rocky Mountain Arsenal.

12

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.

In 2015…a man suffered minor injuries when the tree he took shelter under was struck by lightning. He was jogging at City Park Golf Course when the incident occurred. The jogger was taken to the hospital for observation.

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 powerlines 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.

Continue reading May 11 to May 17: This Week in Denver Weather History →

Springtime severe weather begins to appear with greater frequency in May. As we see in our look back at this week in Denver weather history, flooding rains, dangerous lightning, tornadoes and damaging hail have all made appearances. Just for good measure, Mother Nature has thrown in healthy doses of snow too.

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.

2-4

In 1987…a slow moving storm brought rain…wind…and snow to metro Denver. Rainfall totaled 1.04 inches at Stapleton International Airport where north winds gusted to 48 mph on the 3rd. The foothills received 5 to 10 inches of snow.

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

In 1893…northwest winds were sustained to 42 mph.

In 1971…a funnel cloud was sighted 10 miles southwest of Boulder. Hail stones to 1 inch in diameter fell in southeast Denver…but caused only minor damage.

In 2006…a severe thunderstorm produced hail to 1.00 inch in diameter in Aurora near Cheery Creek Reservoir.

In 2010…high winds downed trees and power lines across parts of the Front Range foothills and urban corridor. Downed power lines sparked a 12-acre wildfire near Conifer. In Boulder…Longmont and Louisville…the wind damaged roofs and broke windows and skylights. Peak wind gusts included: 75 mph in northwest Longmont…71 mph at the national wind technology center and 4 miles south- southwest of superior…61 mph at Broomfield and 56 mph in Erie. At Denver International Airport…a peak wind gust to 46 mph was observed.

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.

5

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.

In 2012…severe thunderstorms produced damaging hail ranging in size from quarters to golf balls in metro Denver including: Aurora…Centennial…Cherry Creek…Englewood… And southeast Denver. Aurora was hit the hardest…with extensive property damage reported to homes and automobiles.

Continue reading May 4 to May 10: This Week in Denver Weather History →