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Thornton’s workweek starts off with seasonal temperatures, some clouds

Monday, February 25th, 2019 4:58am MDT

Finally a day with temperatures near normal for this time year. Highs today should be right where averages say they should be despite having some cloud cover.

The day starts out with mostly clear skies but we will see an increase in clouds leading to partly sunny skies for most of the day. Winds will be generally calm. Highs today will top out close to the average high for the date of 48 degrees.

Tonight, skies remain partly clear with lows near 20 degrees.

Looking ahead, we will continue to enjoy reasonably seasonal conditions through Thursday. Our next storm system arrives Friday bringing cold and a chance for snow. More in the extended forecast here.

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February 24 to March 2: This Week in Denver Weather History

Sunday, February 24th, 2019 4:38pm MDT
This week in Denver weather history

February 24 to March 2: This Week in Denver Weather History

As February comes to a close, one of our snowiest months, March, is ahead.  Our look back at this week in Denver weather history shows there have indeed been some significant snowfalls as well as high wind events.

From the National Weather Service:

22-29

In 1960…heavy snowfall of 6.1 inches at Stapleton Airport on the 22nd and 23rd marked the beginning of a protracted cold spell which lasted until the end of the month. The cloudy… Cold weather was accompanied by occasional light snow or flurries and fog. New record low temperatures for the dates were set on the 24th thru the 29th with the lowest temperature of 11 degrees below zero on the 28th. The seven consecutive days of low temperatures of zero or below had been exceeded in duration only 4 times previously. New low maximum temperatures for the dates were set on the 23rd… 24th…and the 26th thru the 29th with the lowest maximum temperature of 8 degrees recorded on the 26th.

23-24

In 1935…northwest winds sustained to 37 mph with gusts as high as 47 mph produced considerable blowing dust behind a cold front on the 23rd. The dust was dampened by 7.0 inches of snowfall over downtown Denver from the late evening of the 23rd through the evening of the 24th.

In 1997…heavy snow fell in the foothills. Snowfall totals included 8 inches at sunshine canyon northwest of Boulder… And 6 inches at Morrison. Snowfall totaled only 2.4 inches at the site of the former Stapleton International Airport. East winds gusted to only 22 mph at Denver International Airport on the 23rd.

23-25

In 1912…a severe winter storm dumped 14.2 inches of snowfall over downtown Denver. Snow fell continuously from 9:40 am on the 23rd until 9:15 pm on the 25th with most of the snow… 9.2 inches…on the 24th. Temperatures were mostly in the 20’s. Northeast winds were sustained to 20 mph on the 24th.

24

In 1908…a duststorm occured in the city from mid-morning through mid-day. North winds were sustained from 30 to 35 mph.

In 1927…northwest winds were sustained to 42 mph with an extreme velocity to 46 mph.

In 1924…fog deposited a light coating of glaze…which was very thin and only accumulated on the windward side of cold objects. Streets and sidewalks became slippery.

In 1956…a strong cold front produced north wind gusts to 54 mph…but left only 2.0 inches of snowfall at Stapleton Airport.

In 1959…heavy snowfall totaled 7.5 inches at Stapleton Airport…where north-northeast winds gusted to only 18 mph.

In 1968…west-northwest winds gusted to 49 mph at Stapleton International Airport. The strong Chinook winds warmed the maximum temperature to 61 degrees…the highest temperature of the month that year.

In 1986…wind gusts to 65 mph were reported at Table Mesa in Boulder. West winds gusted to only 28 mph at Stapleton International Airport where the high temperature of 70 degrees equaled the record for the date.

In 1991…the only measurable snowfall for the month totaled only 0.8 inch at Stapleton International Airport where north winds gusted to 28 mph. The light snow fell for most of the day.

In 1994…high winds raked the eastern foothills. Wind speeds of 70 to 80 mph were common. Wind gusts to 110 mph were recorded at the National Center for Atmospheric Research in south Boulder…while in north Boulder winds gusted to 95 mph. The strong winds blew the roof off a building at red rocks community college in Lakewood…causing the evacuation of about 1500 people. A semi-trailer and a delivery truck were overturned. In Lakewood…a home under construction was destroyed by the winds. There were numerous reports of vehicles damaged by flying debris…and many automobile windshields were shattered. West wind gusts to 47 mph were recorded at Stapleton International Airport.

In 2013…A storm system near the Four Corners region produced heavy upslope snowfall in and near the Front Range with blizzard conditions further east as it made its way across southern Colorado. In the Front Range Mountains and Foothills storm totals included: 27 inches near Pinecliffe; 24 inches…13 miles northwest of Golden; 20 inches near Genesee; 17 inches near Conifer; 15 inches near Jamestown; 14 inches…just southwest of Eldorado Springs; 12.5 inches near Aspen Springs; 12 inches near Evergreen and Ward; 10 inches at Eldora Ski Area; with 8 inches near Gross Reservoir…Idaho Springs and Nederland. Across the Urban Corridor storm totals included: 12 inches in Aurora; 11.5 inches near Highlands Ranch; 11 inches in Lakewood; 10.5 inches just north of Longmont and Westminster; 10 inches in Lone Tree and Thornton; 8.5 inches in Aurora…6 miles southwest of Denver and near Loveland; 8 inches at Boulder… Broomfield…and Ralston Reservoir; 7.5 inches near Frederick…with 7 inches at Commerce City. The storm prompted the cancellation of 200 flights in and out of Denver International Airport. Officially…the storm system produced 9.1 inches of snow at DIA which established a new daily snowfall record in Denver for the date. Along and south of the I-70 corridor and east of Denver…the combination of heavy snow and strong wind produced blizzard conditions. Storm totals included: 14 inches…10 miles south-southeast of Buckley AFB…10.5 inches…8 miles southeast of Watkins; with 6 inches near Byers. Northerly winds of 25 to 30 mph were common with gusts to 40 mph. At DIA…a peak wind gust of 32 mph was observed.

25

In 1887…northwest winds were sustained to 47 mph.

In 1904…the low temperature cooled to only 49 degrees…the all-time record high minimum temperature for February.

In 1957…north winds gusted to 49 mph at Stapleton Airport.

In 1998…a bora wind storm developed in the Front Range foothills and adjacent plains as winds gusted between 60 and 75 mph. Peak wind gusts during the storm included: 75 mph atop Blue Mountain near Wondervu…60 mph in south Boulder and at Jefferson County Airport near Broomfield. West winds gusted to 32 mph at Denver International Airport.

In 2000…high winds occurred in and near the foothills. Winds gusted to 84 mph at the Rocky Flats Environmental Test Facility south of Boulder and to 71 mph atop Niwot Ridge in the mountains west of Boulder. West winds gusted to only 36 mph at Denver International Airport.

25-26

In 1971…a wind gust to 100 mph was recorded in Boulder at the National Center for Atmospheric Research. The cold west winds gusted to 53 mph in downtown Boulder. No damage was reported. Northwest winds gusted to 31 mph on the 25th and to 38 mph on the 26th at Stapleton International Airport.

In 1984…a heavy snow storm left 1 to 2 feet of new snow in the foothills west of Denver. I-70 was closed…stranding skiers returning from the mountains. Most had to spend several hours in Idaho Springs. The snow spread over metro Denver with 9 inches at Littleton…Castle Rock…and Boulder and up to 5 inches in Aurora and Denver. Snowfall totaled only 3.6 inches at Stapleton International Airport where north winds gusted to 31 mph.

26

In 1884…heavy snowfall totaled 6.0 inches in downtown Denver.

In 1908…a duststorm occurred in the city during the afternoon. Northwest winds were sustained from 14 to 24 mph.

In 1918…pre-frontal Chinook winds from the southwest… Sustained to 43 mph with a maximum velocity to 52 mph… Warmed temperatures to a high of 62 degrees.

In 1954…strong Chinook winds gusting to 52 mph during the morning warmed the temperature in Denver to a balmy 65 degrees by early afternoon. A vigorous Canadian cold front during the late afternoon produced north winds at sustained speeds of 52 mph with gusts as high as 65 mph and billows of blowing dust…which reduced the visibility to as low as 1 mile at Stapleton Airport. Showers left half an inch of snow on the ground as the temperature dipped to a low of 27 degrees before midnight.

In 1989…a brief rain shower produced a microburst wind gust to 51 mph at Stapleton International Airport.

In 1997…snowfall totaled 4 to 6 inches in and near the foothills. Only 0.8 inch of snow fell at the site of the former Stapleton International Airport. Northeast winds gusted to 29 mph at Denver International Airport.

In 2013…a storm system produced heavy snow in the Front Range Foothills. Storm totals included: 12 inches near Black Mountain and Pine Junction…10 inches near Conifer and Nederland; 9 inches…12 miles northwest of Golden; 8 inches near Evergreen…with 6 inches near Eldorado Springs. Snow and blowing snow produced blizzard conditions along and south of the Interstate 70 corridor…just east of Denver. Storm totals generally ranged from 3 to 7 inches. North winds of 25 to 30 mph were reported with gusts around 40 mph. Roads became impassable as snow and blowing snow produced 3 to 4 ft snow drifts. Interstate 70 was closed from Aurora to the Kansas state line. At Denver International Airport…a peak wind gust to 31 mph was reported along with 1.0 inch of snow.

» Click here to read the rest of February 24 to March 2: This Week in Denver Weather History

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Thornton’s weekend starts with cold and snow, will warm up Saturday and Sunday

Friday, February 22nd, 2019 5:07am MDT

The three day period will feature a bit of a mixed bag of weather. Friday will be the coldest day with a wintry mix of precipitation but then Saturday and Sunday improve with dry conditions and warmer temperatures.

For today, a few snow flurries and freezing drizzle will fall this morning. As the day progresses, the drizzle will end but some non-accumulating snow may continue. Temperatures today will be cold with highs only around 29 degrees.

This evening we do expect to see an intensification of the snow and could see some light accumulations from about 4:00pm to midnight. After midnight, precipitation will taper off and toward dawn skies will begin to clear. Overnight lows tonight will be around 18 degrees.

Saturday will see a return of the sun and dry conditions but also, unfortunately a good bit of wind. Mostly sunny skies will be above throughout the day with highs around the 40 degree mark. Winds however will be quite breezy with gusts to 30mph or so possible.

Saturday night into Sunday morning, skies remain mostly clear with lows in the mid-teens.

Sunday will be the most pleasant day of the three day period and at least see temperatures come close to normal. Sunny to mostly sunny skies will be above with highs in the mid-40s. Conditions should be calm and dry.

Have a great weekend!

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Thornton’s Thursday to keep things cool, bring a chance for overnight snow and freezing drizzle

Thursday, February 21st, 2019 5:05am MDT

We are just not quite ready to break out of the chill yet. Today offers another day with well-below normal temperatures and tonight a wintry mix of precipitation could make it a bit tricky tomorrow morning.

Today starts with partly clear skies then we see some easing of cloud cover for mid-day with an increase in clouds in the afternoon as a cold front moves in. Temperatures will struggle to even reach freezing today, continuing our cold February.

This evening, some flurries of snow may be seen with minimal, if any accumulation. Overnight, a wintry mix of light snow and freezing drizzle will be possible. If we get that freezing drizzle, your commute tomorrow could be a slick one. Lows tonight will dip to the teens.

Looking ahead, Friday looks to remain cold and bring just a bit of a chance for some light snow. Saturday and Sunday should see things dry out and warm up a bit though. Get more details in the extended weather forecast here.

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The sun returns for Thornton’s Wednesday but the chilly temps will remain

Wednesday, February 20th, 2019 5:05am MDT

Finally we will get to enjoy some sun after our most recent set of storm systems moves out. In its wake, temperatures are going to remain chilly, especially when coupled with some breezy winds.

Mostly sunny skies start us off and we will have much of that through the day with a bit of an increase in cloud cover in the afternoon.

Winds will be out of the west and become breezy from late morning into early afternoon. Temperatures will only be reaching a high near the freezing mark.

Tonight, mostly cloudy skies will be above with lows to around 11 degrees.

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Tuesday’s weather continues the cold and light snow for Thornton

Tuesday, February 19th, 2019 5:02am MDT

Today’s weather looks to be much like yesterday’s. Temperatures are going to be far below normal for the date and light snow will be seen throughout the day.

Cloudy skies will be above for the majority of the daytime hours other than a brief window around mid-day when some blue might briefly peek out.

Winds will be light and out of the northeast but will add some wind chill to how it feels. High temperatures today will top out in the low 20s.

Light snow will fall this morning then become a bit more sporadic. This evening things may pick up for a brief period. Total accumulations should be less than an inch.

Tonight, a few flurries may be seen with skies starting to clear. Overnight lows will be into the single digits.

Have a great day, stay warm!

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Thornton’s Presidents’ Day weather to feature very cold temps, light snow

Monday, February 18th, 2019 5:04am MDT

We are waking up to a little bit of snow this morning, less than what was expected. The cold however did arrive just as anticipated and will be with us through the day.

Cloudy skies will be above today throughout. There may be a few periods where the cloud coverage lightens but they won’t last long.

We start out in the single digits and will only warm to the teens. Light winds out of the east will bring very cold wind chill readings.

As for snow, some light snow will be possible throughout the day with the best chances coming this morning. This morning roads are deceptively slick so please start your commute early and take it slow.

This evening, snow chances increase again and we could see another inch or so overnight. Tonight, lows will once again drop to the single digits.

Keep an eye on current conditions here.

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February 17 to February 23: This Week in Denver Weather History

Sunday, February 17th, 2019 5:06am MDT
This week in Denver weather history

February 17 to February 23: This Week in Denver Weather History

Staying true to its reputation as a relatively dry month, our look back at this week in Denver weather history doesn’t contain much in the way of snow. What it does have an abundance of however are powerful, damaging wind events.

From the National Weather Service:

15-17

In 1938…a cold air mass brought a light snowfall of 6.2 inches over 3 days to downtown Denver where northeast winds were sustained to 18 mph on the 15th.
16-17 in 1929…strong west winds gusting to 84 mph raked Boulder and Lafayette. Limited minor damage and a few injuries occurred.

In 1986…strong Chinook winds continued to howl in the foothills. A wind gust to 89 mph was recorded at Table Mesa in Boulder on the 16th. Winds of 60 to 75 mph were clocked at other locations in Boulder on both days. A west wind gust to 51 mph was recorded at Stapleton International Airport on the 16th.

16-17

In 1929…strong west winds gusting to 84 mph raked Boulder and Lafayette. Limited minor damage and a few injuries occurred.

In 1986…strong chinook winds continued to howl in the foothills. A wind gust to 89 mph was recorded at Table Mesa in Boulder on the 16th. Winds of 60 to 75 mph were clocked at other locations in Boulder on both days. A west wind gust to 51 mph was recorded at Stapleton International Airport on the 16th.

In 2014…high winds developed briefly overnight in and near the foothills of Boulder and Jefferson Counties. Peak wind reports included: 98 mph…4 miles north-northwest of White Ranch Open Space; 85 mph at the NCAR Mesa Lab; 78 mph at the Junction of Colorado Highways 93 and 172; and 75 mph just southeast of Morrison. A semi-truck and an SUV pulling a trailer were rolled over by the wind on Colorado 470 near Morrison. Strong winds damaged a home under construction in Lakewood.

16-18

In 1970…a wind gust to 90 mph was recorded in Boulder at the National Center for Atmospheric Research. In downtown Boulder…sustained winds of 30 to 40 mph with gusts to 53 mph were measured. Damage was minor. West winds gusted to 45 mph at Stapleton International Airport on the 17th. The strong Chinook winds warmed the temperature to 70 degrees on the 16th and to 72 degrees on the 17th…both records for the date. The low temperature dipped to only 32 degrees on the 16th equaling the record high minimum for the date.

17

In 1887…west winds were sustained to 64 mph. Strong winds occurred all day long in the city. Rainfall was 0.02 inch.

In 1894…northwest winds were sustained to 40 mph with gusts to 46 mph.

In 1937…northwest winds sustained to 36 mph with gusts to 44 mph started a few minor fires and broke a number of plate-glass windows in downtown Denver office buildings.

In 1962…heavy snowfall totaled 7.5 inches at Stapleton Airport where the visibility was reduced to as low as 1/4 mile at times. Winds gusted from the northeast at only 15 mph.

In 2009…strong prefrontal wind gusts knocked down some trees and power lines in Boulder. More than 3400 Xcel customers in the University Hill area were without power for about one hour. Peak wind gusts included 68 mph at the NCAR Mesa Lab and 60 mph in Boulder.

17-18

In 1976…a strong cold front produced wind gusts 30 to 60 mph with much blowing snow and severe dust storms. In the Boulder area…high winds collapsed a garage and broke some windows. Northwest winds gusted to 43 mph on the 17th and to 44 mph on the 18th at Stapleton International Airport.

In 1984…the third blizzard in a week struck eastern Colorado. Heavy snow hit some parts of metro Denver with 8 to 10 inches measured in Aurora…but only 2.9 inches of snow fell at Stapleton International Airport where northwest winds gusted to 31 mph.

In 1999…damaging downslope bora winds developed in the foothills behind a strong cold front. Peak wind reports included: 90 mph at the Gamow Tower on the University of Colorado campus in Boulder; 79 mph at the National Center for Atmospheric Research mesa lab near Boulder and at the national wind technology center south of Boulder; and 72 mph atop Blue Mountain and at Jefferson County Airport. Downed power lines caused major outages for at least 10 thousand residents in Evergreen…Idaho Springs…Golden… And Lakewood. In Golden…the wind toppled a lightning static protection line atop a 70-foot…230 thousand-volt distribution tower. The downed line…sparked a small grass fire just east of the Lookout Mountain youth services center. The fire burned a path approximately 100 yards wide and 1/3 mile long before it was contained.

In 2000…snow…heavy in the mountains and foothills…spread over metro Denver. Snowfall totaled 24 inches at the Eldora Ski Resort with 8 inches measured near Blackhawk. Snowfall was only 1.8 inches at the site of the former Stapleton International Airport…which was the only measurable snow of the month.

17-19

In 2006…a cold spell resulted in 4 temperature records. Low temperatures of 10 degrees below zero on the 17th… 13 degrees below zero on the 18th…and 4 degrees below zero on the 19th were record minimums for those dates. The high temperature of only 7 degrees on the 18th was a record low maximum for the date. Light snow fell on the 17th…but totaled less than half an inch at Denver International Airport.

18

In 1918…post-frontal northwest winds were sustained to 40 mph with a measured extreme velocity to 44 mph.

In 1937…a moderate duststorm occurred during the late afternoon and early evening. Northeast winds sustained to 32 mph with gusts to 41 mph reduced the visibility to 1/2 mile which persisted for about 40 minutes in the city.

In 1998…rare thunder from instability rain and snow showers was heard in Littleton during the late afternoon. Thunder in February only occurs about once every 10 years over metro Denver.

18-19

In 1954…a vigorous cold front produced north winds gusting to 56 mph and a trace of snowfall at Stapleton Airport on the 18th. Strong and gusty winds to 55 mph persisted through the next day and caused some blowing dust.

In 1955…a storm dumped heavy snow across metro Denver. At Stapleton Airport where north winds sustained to 28 mph produced some blowing snow…snowfall totaled 8.8 inches.

18-20

In 1913…post-frontal snowfall totaled 6.9 inches in downtown Denver over the 3 days. Most of the snow fell on the 19th. Northeast winds were sustained to 21 mph with a measured extreme velocity to 24 mph on the 18th.

In 1924…light snowfall totaled 4.6 inches over the 3 days. This was the only measurable snowfall of the month. High temperatures plunged from 45 degrees on the 18th to 17 degrees on the 20th. Low temperatures dipped from 31 degrees on the 18th to only 8 degrees on the 20th. Northeast winds were sustained to 24 mph on the 19th.

In 1953…a major blizzard dumped 10.6 inches of snowfall at Stapleton Airport. Strong north winds at sustained speeds of 25 to 35 mph with gusts as high as 44 mph frequently reduced visibilities to 1/4 mile in blowing snow during the day of the 19th. The strong winds caused much drifting snow…making accurate snowfall measurements almost impossible. Precipitation from the storm totaled 1.13 inches. The 1.01 inches of precipitation on the 19th was the greatest calendar day and 24 hour precipitation ever recorded in the city during the month of February.

In 1987…large amounts of new snow fell in the Front Range foothills. The foothills received 10 to 20 inches of new snow with 4 to 8 inches on the adjacent plains. On the 19th…flight delays occurred at Stapleton International Airport where snowfall totaled 4.2 inches and east winds gusted to only 18 mph on the 19th. Schools were closed in the foothills above Boulder.

19

In 1899…northwest winds sustained to 42 mph with gusts to 45 mph warmed the temperature to a high of 56 degrees… The highest reading of the month that year.

In 1980…high winds were reported in Boulder. Sustained speeds of 50 to 60 mph with gusts to 85 mph were measured. West winds gusted to 31 mph at Stapleton International Airport.

In 1986…Chinook winds continued to buffet the eastern foothills. Winds gusting from 60 to 75 mph were common in the foothills. West winds gusted to 41 mph at Stapleton International Airport.

In 1996…high winds gusting from 70 to 75 mph were reported atop Table Mesa near Boulder. West winds gusted to 44 mph at Denver International Airport.

In 2007…this was the last day of 61 consecutive days with snow cover of 1 inch or more in Denver. This second longest period of snow cover on record began with the blizzard on December 20-21…2006…when 20.7 inches of snow fell at the site of the former Stapleton International Airport where official snow measurements were taken. Additional snowfall during December…January…and February prolonged the event. Snow depth on the ground was measured to the nearest inch once daily at 6:00 am MST.

» Click here to read the rest of February 17 to February 23: This Week in Denver Weather History

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Thornton’s weekend weather starts warm but will trend colder Saturday and Sunday

Friday, February 15th, 2019 5:06am MDT

We will rebound nicely today from yesterday’s chilly afternoon. However, a couple of cold fronts will be making things colder for the balance of the weekend.

Today starts off with a few clouds but those should dissipate and leave us with sunny skies for much of the day. Downslope flow will aid in warming us into the low 50s. Tonight, partly cloudy skies will be above with lows to the low 20s.

Saturday will start out mostly clear but soon see an increase in cloud cover as the first of two weekend cold fronts arrives. Winds will become breezy, particularly in the afternoon and evening. Highs tomorrow will be the in the low 40s. Saturday night into Sunday morning, partly cloudy skies will be above with lows in the mid-teens.

A second cold front arrives Sunday and with it colder temperatures arrive with a slight chance for snow. Highs will only be near the freezing mark under partly sunny skies. The afternoon may bring a bit of light snow.

Looking beyond, as we discussed earlier this week, we are in store for an extended period of below normal temperatures lasting well into next week. Precipitation doesn’t look to be anything extraordinary but there will be a couple chances.

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Mild temperatures but a good bit of cloud cover Thursday, slight chance for overnight snow

Thursday, February 14th, 2019 5:07am MDT

A little bit of a mixed bag of weather for Thornton today. We will enjoy mild daytime temperatures but later a cold front will back in cooling things off and bringing just the slightest chance for precipitation.

The day starts out with mostly sunny skies but then we will see coverage increase leading to partly sunny skies for much of the day. Winds will initially be out of the west then see a move to the south and east as the front approaches. It will be slightly breezy at times.

Temperatures will top out in the low to mid-50s by the early afternoon. After that, the cold front will send temperatures on a gradual descent.

This evening we may see a sprinkle of rain and overnight perhaps a few flakes of snow. Little to no accumulation is expected. Overnight lows will be in the low to mid-20s.

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