{"id":17928,"date":"2017-09-28T09:14:08","date_gmt":"2017-09-28T15:14:08","guid":{"rendered":"http:\/\/www.thorntonweather.com\/blog\/?p=17928"},"modified":"2017-09-28T18:01:48","modified_gmt":"2017-09-29T00:01:48","slug":"september-24-to-september-30-this-week-in-denver-weather-history","status":"publish","type":"post","link":"https:\/\/www.thorntonweather.com\/blog\/weather-history\/september-24-to-september-30-this-week-in-denver-weather-history\/","title":{"rendered":"September 24 to September 30: This week in Denver weather history"},"content":{"rendered":"
\"This<\/a>
September 24 to September 30: This week in Denver weather history<\/figcaption><\/figure>\n

Colorado\u2019s famously inconsistent weather can be seen in our look back at this week in Denver weather history. Not only do we see damaging thunderstorms and winds but even major snowstorms that deposited more than a foot of the white stuff on the city.<\/p>\n

From the National Weather Service:<\/p>\n

23-24<\/p>\n

In 2000\u2026the first snowstorm of the season brought heavy snow to areas in and near the foothills. While the heaviest snow fell north of metro Denver\u20266 inches were measured in Boulder\u20264 inches at both Castle Rock and Morrison\u2026but only 0.2 inch at the site of the former Stapleton International Airport where most of the precipitation fell as rain. At Denver International Airport where drizzle and rain fell on the 23rd\u2026 Snowfall during the early morning of the 24th was estimated at 2.1 inches due to melting. The foothills west of Denver received more snow with 10 inches measured at conifer\u20269 inches 11 miles southwest of Morrison\u2026 8 inches atop Crow Hill\u20267 inches at Chief Hosa\u2026and 5 inches at Ralston Reservoir.<\/p>\n

24<\/p>\n

In 1901\u2026northwest winds were sustained to 50 mph with gusts as high as 57 mph in the city.<\/p>\n

In 1932\u2026thunderstorm rainfall of only 0.11 inch was the only measurable precipitation for the month that year in the city.<\/p>\n

In 1986\u2026a very strong wind storm roared across metro Denver. Boulder was hit hardest. Winds peaked to 131 mph at the National Center for Atmospheric Research. This is thought to be the highest wind gust ever recorded in Boulder during September. A wind gust to 118 mph was clocked on Davidson Mesa and to 92 mph near Niwot. Gusts of 70 to 80 mph were common over all of Boulder where an estimated 70 to 90 large trees were uprooted. About a dozen of them hit cars. Two walls of a building under construction were toppled and solar panels were blown off a house. Traffic lights and power lines were downed. Damage to power equipment alone was estimated at 100 thousand dollars. Wind gusts to 87 mph at Jefferson County Airport damaged two planes. A woman was seriously injured in Boulder. She suffered a fractured skull when struck by a falling tree limb. Trees were also downed in Louisville and Lafayette. West wind gusts to 45 mph were recorded at Stapleton International Airport.<\/p>\n

25<\/p>\n

In 1873\u2026a fire was sighted in the woods near Platte Canyon\u2026 Probably caused by high winds blowing sparks among the timber.<\/p>\n

In 1896\u2026an apparent cold front produced northeast sustained winds to 40 mph with gusts to 48 mph.<\/p>\n

In 1910\u2026a thunderstorm produced sustained north winds to 51 mph. This was the highest recorded wind speed in the city in September at the time.<\/p>\n

In 1936\u2026a vigorous cold front produced a deadly dust storm in the city. North winds sustained to 36 mph with gusts to 38 mph produced much blowing dense dust\u2026greatly restricting the visibility. The temperature plunged from a high of 84 degrees to a low of 38 degrees by midnight. The weather observer described the event with the following. \u201cat 6:00 pm the temperature was 82 degrees and the wind velocity was only 4 mph; but with the wind shifting to the north and the barometer rising quite rapidly\u2026the temperature fell sharply. By 6:30 pm\u2026the wind velocity increased rapidly and by 7:00 pm had reached a maximum sustained velocity of 36 mph\u2026bringing with it clouds of dust which had been picked up by gale force winds in southern Wyoming and northern Colorado\u2026covering the city. The visibility was generally reduced to about 1\/4 mile; however\u2026the whirling of the dust down the streets and alleys\u2026the visibility was at times somewhat less. Airplanes were grounded\u2026traffic was halted at times\u2026and homes filled with dust. The strong winds damaged electric power and telephone lines\u2026leaving homes in darkness for a few hours in the city and for 18 hours in suburban towns and putting 2500 telephones out of service because of broken lines. An electric lineman was killed while repairing damage by the high winds. The dust storm was followed by rain that began falling at 10:55 pm\u2026which turned to snow during the early morning hours of the 26th. A major snow storm followed on the 27th through the 29th.\u201d<\/p>\n

In 1999\u2026high winds developed in the foothills of Boulder County. Winds gusted to 90 mph at Wondervu.<\/p>\n

25-26<\/p>\n

In 1908\u2026apparent post-frontal rain changed to snow overnight and totaled 6.5 inches in downtown Denver. This was the first snow of the season. Precipitation totaled 0.76 inch. North winds were sustained to 39 mph on the 25th.<\/p>\n

25-27<\/p>\n

In 1996\u2026an early season snowstorm brought heavy snow to the Front Range eastern foothills. Snowfall totals included: 8 to 12 inches around conifer\u20267 inches on Floyd Hill\u2026and 6 inches at both Bailey and Chief Hosa. Snowfall totaled only 4.7 inches at the site of the former Stapleton International Airport. This was the first measurable snow of the season. After the passage of a strong cold front\u2026north winds gusted to 38 mph at Denver International Airport on the 25th.<\/p>\n

26<\/p>\n

In 1907\u2026a late afternoon thunderstorm produced hail\u20260.23 inch of precipitation\u2026and north winds sustained to 24 mph.<\/p>\n

In 1927\u2026snowfall of 1.7 inches\u2026mixed at times with sleet\u2026 Was the first measurable snowfall of the season.<\/p>\n

In 2012\u2026a man was seriously injured when he was struck by lightning outside the Hebrew Educational Alliance as he and his family were getting in their car. The victim stopped breathing but was saved when his wife performed cardiopulmonary resuscitation on him immediately.<\/p>\n

26-28<\/p>\n

In 1936\u2026the heaviest snowfall ever recorded in September and the heaviest snowfall ever recorded so early in the season dumped a total of 16.5 inches of snow on downtown Denver and 21.3 inches at Denver Municipal Airport. The 15.0 inches of snow measured from 6:00 pm on the 27th to 6:00 pm on the 28th is the greatest 24 hour snowfall ever recorded in September. This was the first snow of the season. The snow was intermittent through the 26th\u2026but continuous from early afternoon on the 27th to around midnight on the 28th\u2026except for a period of rain during the afternoon of the 28th which contributed to a loss of depth on the ground. The greatest snow depth on the ground downtown was 13 inches with 8 inches at Denver Municipal Airport. There were no high winds with the storm and traffic was interrupted for only a short period. The storm produced property damage estimated at 7 million dollars. With trees and shrubs in full foliage\u2026the leaves caught and held the heavy water-laden snow\u2026until the branches snapped from the weight. More than 3000 workmen were called to remove the debris and snow from the city. The city firemen who were off duty\u2026as well as all the reserves\u2026 were asked to report to their stations. All schools in the city remained open\u2026but attendance was only 50 percent of normal. Grade school students were sent home at noon on the 28th. The early storm caught stockmen with many cattle still in higher ranges. Warm weather followed the snow\u2026which had all melted by the end of the month\u2026except for a few inches in sheltered places.<\/p>\n

<\/span>27<\/p>\n

In 1877\u2026smoke from heavy forest fires in the mountains spread over the city on upper wind currents.<\/p>\n

In 1935\u2026the first snow of the season was 2.8 inches in downtown Denver. The low temperature dipped to 31 degrees for the first freeze of the season.<\/p>\n

<\/span>27-28<\/p>\n

In 1984\u2026heavy snow fell over the plains and foothills. Snowfall amounts ranged from 2 to 5 inches on the plains with up to a foot at higher elevations in the foothills. The main problem caused by the storm was thousands of power outages caused by snow-laden tree limbs snapping and falling onto power lines. Over 15 thousand homes lost power in metro Denver. Some cars were damaged by falling trees and limbs. The snow also caused some flight delays at Stapleton International Airport where 5.1 inches of snow fell and northeast winds gusted to 29 mph. Maximum snow depth on the ground was 3 inches due to melting. The high temperature of only 34 degrees on the 28th was a record low maximum for the date and equaled the all-time record for the month at that time.<\/p>\n

28<\/p>\n

In 1877\u2026heavy dense smoke from mountain forest fires spread over the city. The smoke was so dense that it obscured the sun at times.<\/p>\n

In 1921\u2026post-frontal northeast winds were sustained to 44 mph.<\/p>\n

In 1953\u2026a pacific cold front produced a west wind gust to 59 mph at Stapleton Airport where the visibility was briefly reduced to 3\/4 miles in blowing dust. Strong winds were also widespread over Boulder during the afternoon.<\/p>\n

In 1960\u2026strong\u2026gusty winds tore the roof from 6 units of a motel on west Colfax Avenue in Denver. The roofing sailed over the building and crashed down on a truck\u2026wrecking it. The strong winds were the result of an apparent microburst.<\/p>\n

In 1999\u2026snow fell in the foothills west of metro Denver and over the plains. Snowfall totals included 7 inches at conifer. At the site of the former Stapleton International Airport\u20263.1 inches of snow were measured. This was the first snow of the season. The heavy wet snow snapped branches from fully leafed trees\u2026downing power lines and causing scattered outages.<\/p>\n

In 2004\u2026severe thunderstorms produced hail to 3\/4 inch in diameter in Littleton and in Douglas County 14 miles northwest of Castle Rock.<\/p>\n

In 2012\u2026a weak tornado (EF-0) tornado touched down near Strasburg. \u00a0No damage was reported.<\/p>\n

28-29<\/p>\n

In 1959\u2026one 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\u2026which were still in full leaf. The storm dumped 10.6 inches of snow at Stapleton Airport\u2026the third heaviest September snow amount to date. Falling trees and limbs disrupted traffic\u2026broke power and communication lines\u2026and damaged buildings and cars. One man was killed in Denver by a falling tree limb\u2026and 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\u2026repairing utility lines\u2026and 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.<\/p>\n

In 1985\u2026an 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\u2019s 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\u2026causing 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\u2026the 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.<\/p>\n

29<\/p>\n

In 1966\u2026a vigorous cold front moved thru metro Denver. North winds gusting to 51 mph kicked up billows of blowing dust\u2026which 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.<\/p>\n

In 1985\u2026the lowest temperature ever recorded in September\u2026 17 degrees\u2026occurred. The high temperature warmed to only 29 degrees\u2026the all-time record low maximum for the month.<\/p>\n

In 1994\u2026the 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\u2026establishing a new record at that time. The previous record of 52 \u201c90 degree days\u201d occurred in 1978. Only 43 \u201c90 degree days\u201d were recorded at Denver International Airport during 1994.<\/p>\n

In 1995\u2026lightning struck a couple in Aurora as they were walking in the rain. The bolt struck the umbrella the man was carrying\u2026injuring both the man and his wife.<\/p>\n

In 2000\u2026late afternoon thunderstorms produced strong wind gusts to 76 mph in Westminster\u2026to 69 mph near Boulder\u2026and to 60 mph at Jefferson County Airport near Broomfield. No damage was reported.<\/p>\n

In 2014\u2026a storm system that moved through the area produced large hail and street flooding in parts of metro Denver and then spread east into the plains. The storm also caused multiple accidents. A semi became detached from a trailer\u2026 blocking traffic on westbound Interstate 70 west of Tower Road. Downed power poles blocked a roadway on CO 79 near Bennett\u2026at mile marker 10. In addition to the damaging winds\u2026the storms produced large hail\u2026from nickel to golfball size across southern and eastern portions of metro Denver. The hailstorm was the most damaging of the 2014 summer season\u2026with insured losses that topped 213 million dollars. \u00a0Insurance claims included 29297 automobile claims worth more than 87.2 million dollars and 14287 property claims for 126 million dollars\u2026ranking the storm as the eighth most expensive to hit the state. At Denver International Airport\u20261.01 inches of rainfall was recorded which was the greatest 24-hr rainfall for the date. In addition\u2026a peak wind gust to 38 mph was observed at the airport.<\/p>\n

30<\/p>\n

In 1898\u2026south winds were sustained to 41 mph with gusts to 54 mph.<\/p>\n

In 1940\u2026a late season thunderstorm in the city caused one lightning death.<\/p>\n

In 1944\u2026the month ended with a trace of rain on this date and for the month. A trace of rain also occurred on the 4th\u20269th\u2026and 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.<\/p>\n

30-1<\/p>\n

In 1959\u2026heavy snowfall totaled 5.9 inches at Stapleton Airport. Winds were light.<\/p>\n","protected":false},"excerpt":{"rendered":"

Colorado\u2019s famously inconsistent weather can be seen in our look back at this week in Denver weather history. Not only do we see damaging thunderstorms and winds but even major snowstorms that deposited more than a foot of the white stuff on the city. From the National Weather Service: 23-24 In 2000\u2026the first snowstorm of … Continue reading September 24 to September 30: This week in Denver weather history<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[81,106,62,441,741],"_links":{"self":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17928"}],"collection":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/comments?post=17928"}],"version-history":[{"count":1,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17928\/revisions"}],"predecessor-version":[{"id":17929,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17928\/revisions\/17929"}],"wp:attachment":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/media?parent=17928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/categories?post=17928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/tags?post=17928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}