{"id":1825,"date":"2009-09-20T12:09:11","date_gmt":"2009-09-20T19:09:11","guid":{"rendered":"http:\/\/www.thorntonweather.com\/blog\/?p=1825"},"modified":"2009-09-20T12:09:11","modified_gmt":"2009-09-20T19:09:11","slug":"september-20-to-september-26-this-week-in-denver-weather-history","status":"publish","type":"post","link":"https:\/\/www.thorntonweather.com\/blog\/thornton-weather\/september-20-to-september-26-this-week-in-denver-weather-history\/","title":{"rendered":"September 20 to September 26 – This week in Denver weather history"},"content":{"rendered":"
\"September
September 20 to September 26 - This week in Denver weather history<\/figcaption><\/figure>\n

Looking back at this week in Denver history we start to see more of the signs that summer is coming to an end and fall and winter are right around the corner.\u00a0 Summer-like severe weather can still occur but we also start to see more cold temperatures and occasions with snow become more prevelant.<\/p>\n

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

20\u00a0\u00a0\u00a0<\/p>\n

In 1921…an apparent Bora produced northwest winds sustained to 44 mph with gusts to 64 mph.
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\nIn 1955…hail stones 1\/2 to 3\/4 inch in diameter were reported across parts of the city of Denver.
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\nIn 1992…weather observers at Buckley Air National Guard base sighted two tornados southeast of the base.\u00a0 The tornados were short-lived and caused no injuries or damage.<\/p>\n

20-21<\/p>\n

In 1963…heavy rain and hail caused local flooding in southeast Denver.\u00a0 Thunderstorm rainfall was only 0.60 inch at Stapleton Airport on the 20th.
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\nIn 1983…the cold front on the 19th brought an unusually cold air mass into metro Denver for so early in the season.\u00a0 The temperature dipped to a daily record minimum of 28 degrees on both days.
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\nIn 1995…a vigorous late summer storm brought the season’s first heavy snow to portions of metro Denver.\u00a0 Millions of trees were damaged and power lines downed as 4 to 8 inches of heavy wet snow settled on fully leafed trees in the Boulder and Denver areas.\u00a0 Branches snapped and trees split under the weight of heavy snow…downing power lines. Firefighters responded to numerous transformer fires. Around 100 thousand people were left without electricity in Boulder and Denver areas alone.\u00a0 It took over a week to fully restore power to some areas.\u00a0 Insurance claims were estimated to be around 6 million dollars to homes in metro Denver and about 500 thousand dollars in damage to automobiles.\u00a0 It was estimated that about 80 percent of 125 million dollars worth of city owned trees in Denver were damaged.\u00a0 Snowfall totaled 7.4 inches at the site of the former Stapleton International Airport where the greatest depth of snow on the ground was only 4 inches due to melting.\u00a0 Temperature records were set on the 21st when the thermometer dipped to a record low reading of 27 degrees and climbed to a high of only 36 degrees… Setting a record low maximum for the date.\u00a0 North winds gusted to 29 mph at Denver International Airport on the 20th.<\/p>\n

20-22<\/p>\n

In 1902…a thunderstorm on the 20th…in advance of an apparent cold front…produced rain…hail…and northwest winds to 40 mph with gusts to 48 mph.\u00a0 Widespread rain developed behind the cold front and totaled 3.21 inches from the evening of the 20th through the early afternoon of the 22nd.\u00a0 The 2.70 inches of precipitation recorded from 800 pm on the 20th to 800 pm on the 21st is the greatest 24 hour precipitation ever recorded in the month of September.\u00a0 The temperature dipped from a high of 80 degrees on the 20th to a high of only 51 degrees on the 21st.<\/p>\n

21\u00a0\u00a0\u00a0<\/p>\n

In 1951…4.2 inches of snow fell at Stapleton Airport… Where northeast winds gusted to 27 mph.\u00a0 This was the first snowfall of the season in Denver…marking the end of the second shortest snow-free period on record…109 days…from June 4th through September 20th.\u00a0 A trace of snow fell on June 3rd.
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\nIn 1984…thunderstorm winds gusted to 56 mph at Stapleton Airport.
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\nIn 1992…the only precipitation of the month at Stapleton International Airport…0.01 inch of rain…fell from a brief shower around daybreak.
\n21-22 in 1870…strong winds occurred in the foothills and in Boulder and Denver.
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\nIn 1895…rain changed to snow overnight and totaled 11.4 inches in downtown Denver.\u00a0 This was the first snowfall of the season and the second heaviest first snowfall of the season on record.\u00a0 North winds were sustained to 27 mph with gusts to 30 mph on the 21st.<\/p>\n

22\u00a0\u00a0\u00a0<\/p>\n

In 1913…a thunderstorm produced northwest winds sustained to 40 mph with gusts to 44 mph.
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\nIn 1946…a trace of snow fell in downtown Denver.\u00a0 This marked the start of the longest snow season on record… 263 days through June 11…1947…when a trace of snow also fell.<\/p>\n

23\u00a0\u00a0\u00a0<\/p>\n

In 1873…north to northwest winds blowing almost a gale spread clouds of dust and sand into the city during the afternoon and evening.\u00a0 From the roof of the weather observer’s building…houses a few hundred yards away were not visible and not even the sky could be seen through the clouds of sand.\u00a0 The wind reached sustained speeds of 35 mph…but only 28 mph was registered for any one hour.
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\nIn 1977…wind gusts from 50 to 80 mph were reported along the foothills.\u00a0 A northwest wind gust to 53 mph was recorded at Stapleton International Airport.<\/p>\n

23-24<\/p>\n

In 2000…the first snowstorm of the season brought heavy snow to areas in and near the foothills.\u00a0 While the heaviest snow fell north of metro Denver…6 inches were measured in Boulder…4 inches at both Castle Rock and Morrison…but only 0.2 inch at the site of the former Stapleton International Airport where most of the precipitation fell as rain.\u00a0 At Denver International Airport where drizzle and rain fell on the 23rd… Snowfall during the early morning of the 24th was estimated at 2.1 inches due to melting.\u00a0 The foothills west of Denver received more snow with 10 inches measured at Conifer…9 inches 11 miles southwest of Morrison… 8 inches atop Crow Hill…7 inches at Chief Hosa…and 5 inches at Ralston Reservoir.<\/p>\n

24\u00a0\u00a0\u00a0<\/p>\n

In 1901…northwest winds were sustained to 50 mph with gusts as high as 57 mph in the city.
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\nIn 1932…thunderstorm rainfall of only 0.11 inch was the only measurable precipitation for the month that year in the city.
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\nIn 1986…a very strong wind storm roared across metro Denver.\u00a0 Boulder was hit hardest.\u00a0 Winds peaked to 131 mph at the National Center for Atmospheric Research.\u00a0 This is thought to be the highest wind gust ever recorded in Boulder during September.\u00a0 A wind gust to 118 mph was clocked on Davidson Mesa and to 92 mph near Niwot.\u00a0 Gusts of 70 to 80 mph were common over all of Boulder where an estimated 70 to 90 large trees were uprooted.\u00a0 About a dozen of them hit cars.\u00a0 Two walls of a building under construction were toppled and solar panels were blown off a house.\u00a0 Traffic lights and power lines were downed.\u00a0 Damage to power equipment alone was estimated at 100 thousand dollars. Wind gusts to 87 mph at Jefferson County Airport damaged two planes.\u00a0 A woman was seriously injured in Boulder. She suffered a fractured skull when struck by a falling tree limb.\u00a0 Trees were also downed in Louisville and Lafayette.\u00a0 West wind gusts to 45 mph were recorded at Stapleton International Airport.<\/p>\n

25\u00a0\u00a0\u00a0<\/p>\n

In 1873…a fire was sighted in the woods near Platte Canyon… Probably caused by high winds blowing sparks among the timber.
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\nIn 1896…an apparent cold front produced northeast sustained winds to 40 mph with gusts to 48 mph.
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\nIn 1910…a thunderstorm produced sustained north winds to 51 mph.\u00a0 This was the highest recorded wind speed in the city in September at the time.
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\nIn 1936…a vigorous cold front produced a deadly dust storm in the city.\u00a0 North winds sustained to 36 mph with gusts to 38 mph produced much blowing dense dust…greatly restricting the visibility.\u00a0 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. “at 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…the temperature fell sharply.\u00a0 By 6:30 pm…the wind velocity increased rapidly and by 7:00 pm had reached a maximum sustained velocity of 36 mph…bringing with it clouds of dust which had been picked up by gale force winds in southern Wyoming and northern Colorado…covering the city.\u00a0 The visibility was generally reduced to about 1\/4 mile; however…the whirling of the dust down the streets and alleys…the visibility was at times somewhat less.\u00a0 Airplanes were grounded…traffic was halted at times…and homes filled with dust.\u00a0 The strong winds damaged electric power and telephone lines…leaving 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.\u00a0 An electric lineman was killed while repairing damage by the high winds.\u00a0 The dust storm was followed by rain that began falling at 10:55 pm…which turned to snow during the early morning hours of the 26th.\u00a0 A major snow storm followed on the 27th through the 29th.”
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\nIn 1999…high winds developed in the foothills of Boulder County.\u00a0 Winds gusted to 90 mph at Wondervu.<\/p>\n

25-26<\/p>\n

In 1908…apparent post-frontal rain changed to snow overnight and totaled 6.5 inches in downtown Denver.\u00a0 This was the first snow of the season.\u00a0 Precipitation totaled 0.76 inch. North winds were sustained to 39 mph on the 25th.<\/p>\n

25-27<\/p>\n

In 1996…an early season snowstorm brought heavy snow to the Front Range eastern foothills.\u00a0 Snowfall totals included:\u00a0 8 to 12 inches around Conifer…7 inches on Floyd Hill…and 6 inches at both bailey and Chief Hosa. Snowfall totaled only 4.7 inches at the site of the former Stapleton International Airport.\u00a0 This was the first measurable snow of the season.\u00a0 After the passage of a strong cold front…north winds gusted to 38 mph at Denver International Airport on the 25th.<\/p>\n

26\u00a0\u00a0\u00a0<\/p>\n

In 1907…a late afternoon thunderstorm produced hail…0.23 inch of precipitation…and north winds sustained to 24 mph.
\n\u00a0
\nIn 1927…snowfall of 1.7 inches…mixed at times with sleet… Was the first measurable snowfall of the season.<\/p>\n

26-28<\/p>\n

In 1936…the 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.\u00a0 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.\u00a0 This was the first snow of the season.\u00a0 The snow was intermittent through the 26th…but continuous from early afternoon on the 27th to around midnight on the 28th…except for a period of rain during the afternoon of the 28th which contributed to a loss of depth on the ground.\u00a0 The greatest snow depth on the ground downtown was 13 inches with 8 inches at Denver municipal airport.\u00a0 There were no high winds with the storm and traffic was interrupted for only a short period.\u00a0 The storm produced property damage estimated at 7 million dollars.\u00a0 With trees and shrubs in full foliage…the leaves caught and held the heavy water-laden snow…until the branches snapped from the weight.\u00a0 More than 3000 workmen were called to remove the debris and snow from the city.\u00a0 The city firemen who were off duty…as well as all the reserves… were asked to report to their stations.\u00a0 All schools in the city remained open…but attendance was only 50 percent of normal.\u00a0 Grade school students were sent home at noon on the 28th.\u00a0 The early storm caught stockmen with many cattle still in higher ranges.\u00a0 Warm weather followed the snow…which had all melted by the end of the month…except for a few inches in sheltered places.<\/p>\n","protected":false},"excerpt":{"rendered":"

Looking back at this week in Denver history we start to see more of the signs that summer is coming to an end and fall and winter are right around the corner.\u00a0 Summer-like severe weather can still occur but we also start to see more cold temperatures and occasions with snow become more prevelant. From … Continue reading September 20 to September 26 – 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":[7,63],"tags":[81,106,62,741],"_links":{"self":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/1825"}],"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=1825"}],"version-history":[{"count":2,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/1825\/revisions"}],"predecessor-version":[{"id":1827,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/1825\/revisions\/1827"}],"wp:attachment":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/media?parent=1825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/categories?post=1825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/tags?post=1825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}