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Thornton, Colorado, USA
UpdatedSun, 18-Nov-2018 5:55am MST 
 

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Tuesday gets much colder, will bring rain and snow

Tuesday, October 30th, 2018 5:00am MST

A big change from the unseasonably warm weather we have seen in recent days. A storm system will be pushing through that will send temps plunging and offer our first chance at precipitation in weeks.

Cloudy skies will be the rule today throughout. Temperatures are going to remain relatively stable with a high only in the lower 40s.

A few sprinkles of rain may pop up this morning with them becoming more likely in the afternoon. As we approach the evening and temperatures cool, a transition to snow should occur. We could see an inch or so between 6:00pm and midnight, then maybe just a bit more on top of that before dawn tomorrow.

Lows tonight will dip to around freezing.

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Thornton’s workweek starts with one more mild day, breezy PM winds

Monday, October 29th, 2018 4:59am MST

Hopefully you took advantage of that warm weather this past weekend. If not, be sure you do so today because much colder and possibly wetter weather arrives tomorrow.

For today, mostly sunny skies will be above throughout. Temperatures will be topping out in the upper 70s, well above the normal for the date of 60 degrees. Conditions will be calm this morning then this afternoon winds will be picking up as a front approaches.

Tonight, clouds will be increasing and the wind will continue until the pre-dawn hours. Lows will be in the mid to upper 30s.

Looking ahead, Tuesday will be the coldest day of the week with highs only in the low 40s and a decent chance to snow. Unfortunately, little accumulation is expected for us. We will then see a gradual warm up into the latter half of the week. Get more details in the extended weather forecast here.

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October 28 to November 3: This week in Denver weather history

Sunday, October 28th, 2018 5:22am MST
This week in Denver weather history

October 28 to November 3: This week in Denver weather history

As we move further into fall, we see the predominant significant weather in our history during the period involves snowstorms.

From the National Weather Service:

27-28

In 1874…strong west winds in Boulder along with a reported tornado produced 150 dollars in damage.

In 1913…a strong cold front produced sustained northeast winds to 35 mph with gusts as high as 38 mph on the 27th. Overnight snowfall totaled 5.8 inches. Temperatures plunged to a low of 17 degrees on the morning of the 28th after a high of 60 degrees on the 27th.

27-30

In 2009…a powerful early season storm brought heavy snow to the Front Range. The combination of a deep northeasterly upslope flow coupled with abundant moisture and lift with the developing storm system produced an extended period of moderate to heavy snowfall. The heavy wet snow accumulated on trees and resulted in broken branches and scattered electrical outages. Interstates 70 and 76 were closed east of Denver. Numerous other roads and highways were shut down. The Red Cross set up numerous emergency shelters for stranded travelers. The blowing snow at Denver International Airport forced the cancellation of hundreds of flights. Schools were also closed. In the foothills storm totals included: 46 inches… 3 miles southeast of Pinecliffe; 42 inches…3 miles southwest of conifer; 34 inches…3 miles north of Blackhawk; 30 inches at Aspen Springs and near Evergreen… 23 inches at Roxborough Park…and 20 inches…3 miles south-southeast of Morrison. Across the urban corridor storm totals included: 25 inches in Highlands Ranch; 21.5 inches near Louisville…20.5 inches in Broomfield… 20 inches at Lafayette…17.5 inches in Boulder…17 inches in Westminster…16.5 inches in Erie; 15.5 inches in Arvada and 5 miles west-northwest of Littleton…15 inches in Littleton…14 inches in Englewood…13.5 inches in Lakewood and 6 miles north of Thornton; 13.3 inches at Denver International Airport…11 inches…4 miles south of Denver; 10.5 inches…2 miles north of Cherry Hills Village and Niwot.

28

In 1917…post-frontal snowfall totaled 6.5 inches in the city. North winds sustained to 30 mph with gusts to 33 mph caused the temperature to plunge from a high of 58 degrees to a low of 9 degrees by midnight.

In 1967…winds gusted to 65 mph in downtown Boulder…causing minor damage. South winds gusted to 32 mph at Stapleton International Airport.

In 1991…the first major snow of the season hit metro Denver as a cold arctic air mass moved over the area. Snowfall amounts across northeast Colorado ranged from 3 to 10 inches with 4.4 inches of snowfall recorded at Stapleton International Airport where north winds gusted to 22 mph. The low temperature dipped to 13 degrees.

In 1993…high winds buffeted the Front Range foothills. A wind gust to 83 mph was recorded atop Squaw Mountain…35 miles west of Denver…and a gust to 76 mph occurred near Rollinsville southwest of Boulder.

28-29

In 1993…an upper level disturbance combined with a moist upslope flow to bring heavy snow to portions of metro Denver. Snowfall amounts ranged from 5.4 inches at Stapleton International Airport to 14 inches in Boulder. New snowfall totaled 8 inches at Gross Reservoir in the foothills 5 miles southwest of Boulder. On the 28th…north winds gusted to 30 mph at Stapleton International Airport where the temperature climbed to only 25 degrees on the 29th…equaling the record low maximum for the date.

28-30

In 1971…a vigorous cold front plunged temperatures from a high of 70 degrees on the 27th to record low levels on the 29th and 30th. Snowfall totaled 3.1 inches at Stapleton International Airport where north winds gusted to 23 mph. Some freezing drizzle also fell on the 28th. Record daily low maximum temperatures of 32 degrees on the 28th and 25 degrees on the 29th were established along with a daily record minimum of 13 degrees on the 30th.

28-31

In 1929…rain changed to snow on the afternoon of the 28th and continued until midday on the 30th followed by intermittent light snow which continued through the 31st. Snowfall over the four days totaled 16.2 inches in the city. Most of the snow…8.5 inches…fell on the 29th with 6.1 inches on the 30th. Temperatures hovered in 20’s during most of the storm.

29

In 1917…the all-time lowest recorded temperature in October…2 degrees below zero…occurred. This is also the earliest below zero reading of the season.

In 1939…the first measurable snow of the season totaled 5.6 inches in downtown Denver. Post-frontal northeast winds were sustained to 28 mph.

In 1961…heavy snowfall measured 6.0 inches at Stapleton Airport where northeast winds gusted to 30 mph.

In 1973…strong winds caused some damage to homes…stores… And utility lines along the foothills from metro Denver south.

In 1981…high winds buffeted the Front Range foothills with gusts to 55 mph in south Boulder.

In 1996…high winds gusting from 70 to around 100 mph blasted metro Denver. One man was killed when a strong wind gust overturned a pop-up camper onto him while he was trying to secure it. In addition…five people at the Rocky Flats Environmental Test Facility received minor injuries when several windshields were blown out of their cars…spraying glass onto the occupants. Several trees and power lines were also downed. Two 75-foot high pine trees were uprooted at the Mt. Olivet Cemetery in Arvada. Property damage from the windstorm ran into the millions of dollars. The highest recorded wind gusts included: 101 mph at Jefferson County Airport near Broomfield…100 mph in Golden Gate Canyon…96 mph in Coal Creek Canyon…and 87 mph at upper Table Mesa in Boulder. West-northwest winds gusted to 43 mph at Denver International Airport. Insured damage from the wind storm totaled 5.2 million dollars…the third most costly storm of record in Colorado at the time.

In 2003…strong Chinook winds developed in and near the Front Range foothills. Winds gusting to 80 mph in Boulder downed several trees and power lines…causing damage and triggering scattered electrical outages. The combination of strong winds…very dry fuel conditions…and downed power lines sparked two large wildfires. The overland wildfire in Boulder County…near Jamestown…consumed nearly 3900 acres and destroyed 12 structures…including homes…trailers…and out-buildings. Preliminary damage estimates for the value of lost property was nearly one million dollars. In Douglas County…the Cherokee Ranch wildfire consumed 1200 acres and destroyed 4 structures. The large smoke plumes from both fires were highly visible across metro Denver. West winds gusted to 45 mph at Denver International Airport.

» Click here to read the rest of October 28 to November 3: This week in Denver weather history

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Thornton to enjoy a pleasant fall weekend with unseasonably warm temps, calm conditions

Friday, October 26th, 2018 5:00am MST

If you like your weekends with lots of sun and mild temperatures, then you will be pleased with this one. Other than some breezy winds Saturday afternoon, it will be a good one to spend some time outdoors.

Things get started on Friday with mostly sunny skies above throughout the day. Highs will be topping out in the upper 60s with overall calm conditions. Friday night, partly cloudy skies will be above with lows in the low 40s.

Saturday will be the warmest of the three day period with highs in the low to mid-70s under mostly sunny skies. There will be some breezy winds in the afternoon and early evening as a weak cold front moves through. Saturday night into Sunday morning, partly sunny skies will be above with a low temp reading around 40 degrees.

We close out the weekend on Sunday with a healthy dose of sun, calm conditions and highs in the mid to upper 60s.

Enjoy the weekend weather!

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Thornton’s Thursday to offer temps a bit above normal, increasing clouds

Thursday, October 25th, 2018 4:58am MST

A pretty decent day ahead for us as mercury readings will come in a bit above normal. We will see an increase in cloud cover though as a system pushes through.

Mostly sunny skies start things off. By late morning / early afternoon clouds will increase. However, we are not expecting any moisture in our area as that should stay to our west.

Winds will be a touch breezy in the afternoon but not too intrusive. Highs today will top out in the mid-60s.

Tonight, clouds will decrease with lows near the 40 degree mark.

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A few sprinkles early then seasonal conditions for the rest of Thornton’s Wednesday

Wednesday, October 24th, 2018 5:04am MST

We’re seeing a few sprinkles of rain early but those have not amounted to much and will be ending soon. The balance of the day will see skies clear a bit and temps top out near normal.

Mostly cloudy skies start things off with a few of the aforementioned sprinkles of rain. Those will be ending by 8:00am then the rest of the day will remain dry. Skies will see some clearing with partly sunny skies arriving for the afternoon. Temperatures today will top out right near the average high for the date of 62 degrees.

Tonight, skies will be partly clear with lows around 40 degrees.

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Tuesday sees temps cool to close to normal, brings a slight chance for a shower

Tuesday, October 23rd, 2018 5:02am MST

A little bit of a change in our weather today as a couple of troughs impact Colorado. Increased clouds and cooler temperatures are the most notable features but we do also have a bit of a chance to see some rain.

Partly cloudy skies start things off and we will have similar conditions above throughout the day. Winds will be calm this morning then a bit breezy in the afternoon. Temperatures will top out in the low to mid-60s.

Mid-afternoon through tonight brings us slight chances of a shower or two. There isn’t much to work with here so if it does rain, we aren’t expecting much.

Tonight, mostly cloudy skies remain above with a slight chance for lingering showers. Lows will be in the low 40s.

Keep an eye out for showers here.

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Thornton’s workweek starts out with mild temperatures, a few more clouds

Monday, October 22nd, 2018 5:01am MST

We enjoyed some nice weather this past weekend and today we continue the warm conditions. There will however be more cloud cover due to moisture aloft.

The day starts out with mostly sunny skies. After noon, the moisture increases leading to additional cloud coverage. Temperatures will be topping out in the mid to upper 60s. Tonight, skies will be mostly cloudy with lows to around the 40 degree mark.

Looking ahead, a weak system moves through tomorrow cooling things down and bringing a bit of a chance for light rain into Wednesday. We will then rebound though with dry, calm conditions for the balance of the week. Get a look at our extended weather forecast here.

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October 21 to October 27: This week in Denver weather history

Sunday, October 21st, 2018 1:21am MST
This week in Denver weather history

October 21 to October 27: This week in Denver weather history

This week in Denver weather history is notable for one dominant weather condition: snow. In our look back through history we see many significant snow events, some of which occurred as recently as just last year.

From the National Weather Service:

18-23

In 2003…an extended warm spell resulted in 5 new temperature records. The high temperature of 84 degrees on the 18th equaled the record high for the date. High temperatures of 86 degrees on the 19th…83 degrees on the 21st…and 84 degrees on the 22nd were record highs for the dates. Low temperature of 49 degrees on the 23rd was a record high minimum for the date. Low temperatures during the period were in the 40’s and lower 50’s.

19-23

In 1906…heavy snowfall totaled 22.7 inches in the city over the 5 days. Rain changed to snow on the evening of the 19th…and snow continued through the late afternoon of the 23rd. The heaviest amount of snowfall…16.0 inches…fell from 8:00 pm on the 20th to 8:00 pm on the 22nd. The most snow on the ground was 13.3 inches on the evening of the 23rd. This was the first snow of the season and the only snow of the month. Winds during the storm were from the north at sustained speeds of 20 to 30 mph each day. Temperatures during the storm were generally in the 20’s.

20-21

In 2007…a storm system brought heavy snow to the southern Denver suburbs as well as the Palmer Divide south of Denver. Storm totals included: 7.5 inches near Castle Rock…Lone Tree and Greenwood Village…with 6.5 inches at Elizabeth. Snow drifts up to 2 feet deep were observed 6 miles south-southwest of Elizabeth. In the Denver Stapleton area…2.0 inches of snow was observed.

In 2009…heavy snow developed along the Palmer Divide south and southeast of Denver as a storm system tracked across southern Colorado and northern New Mexico. Storm totals included: 15 inches…15 miles north of Elizabeth…9 inches…5 miles south-southwest of Arapahoe Park; 8 inches in Highlands Ranch…5 miles south- southeast of Sedalia; 6.5 inches…8 miles southwest of Bennett and 6 inches in Parker. At Denver international… Only 1.5 inches of snowfall was observed.

20-22

In 1936…5.5 inches of snow fell over downtown Denver. Most of the snow…4.5 inches…fell on the 20th.

21

In 1920…the rare event of snow from a thunderstorm occurred in the city during the evening. Brilliant flashes of lightning and loud peals of thunder were first noted at 7:35 pm. Light rain began falling at 8:30 pm…and light moist snow began falling a few minutes later. Some soft hail was also seen falling with the rain and snow…but both melted almost as fast as they fell. The hail only continued for a few minutes…and the rain and snow ceased about 9:40 pm. The snowfall was the first to occur in Denver this season. The amount of precipitation at the station measured only 0.01 inch…but heavier amounts were reported from other parts of the city. Snowfall was only a trace.

21-22

In 1978…heavy rain on the 21st changed to snow by daybreak on the 22nd and continued the rest of the day. This was the first measurable snowfall of the season…but totaled only 1.7 inches at Stapleton International Airport where east winds gusted to 29 mph. While only a trace of snow covered the ground…precipitation totaled 1.27 inches.

22

In 1878…winds were sustained to 42 mph.

In 1887…the first measurable snow of the season occurred… Ending the longest snow-free period in Denver…232 days… Since the last snow on March 5th.

In 1947…the first snow of the season totaled only 1.6 inches. Post-frontal north winds caused temperatures to plunge from a high of 60 degrees at midnight to a low of only 30 degrees 24 hours later. This was the only snow of the month.

In 1985…high winds gusting from 60 to 80 mph buffeted the Front Range foothills. The strongest reported wind gust was 89 mph in eastern Boulder. A tree house east of Boulder was set on fire by a downed power line. Two people in Boulder were injured. A woman broke her arm when the strong winds knocked her to the ground. A carpenter in the city suffered a severely cut hand while he was trying to repair a roof that was being torn from a building. At Stapleton International Airport…northwest winds gusted to 41 mph.

In 2001…west-northwest winds gusting as high as 54 mph warmed the temperature to a high of 70 degrees at Denver International Airport.

22-23

In 1914…post-frontal rain changed to snow. Precipitation totaled 2.72 inches…most of which was in the form of moist snow which melted as it fell in the business section of the city. About 3 inches of snow was measured on lawns in the residential areas on the morning of the 24th. Official snowfall totaled only 0.4 inch downtown… But an estimated 8.0 inches of snow melted as it fell. North to northeast winds were sustained to 29 mph with gusts to 30 mph on both days.

In 1975…a vigorous cold front moving across metro Denver followed by strong northeast winds gusting to 52 mph produced billows of blowing dust and plunged the temperature 21 degrees in an hour. The surface visibility was reduced to 1/4 mile in blowing dust at Stapleton International Airport. The temperature cooled from a daily record high of 81 degrees to a low of 38 degrees by day’s end. The first snowfall of the season totaled 2.7 inches on the 23rd. This was the only measurable snow of the month at Stapleton International Airport.

In 1995…heavy snow fell on the palmer ridge south of Denver and in the foothills west of Denver where snow amounts ranged from 4 to 8 inches. Sedalia…south of Denver… Received 8 inches of snow. Winds strengthened on the plains and produced blizzard conditions…reducing surface visibilities to less than 1/4 mile. I-70 was closed from just east of Denver at Gun Club Road to the Kansas border. Ten inches of snow fell at Strasburg east of Denver where north winds at sustained speeds of 35 to 45 mph with gusts as high as 60 mph produced 2 to 4 foot drifts. Snowfall totaled only 2.2 inches at the site of the former Stapleton International Airport. North winds gusted to 51 mph at Denver International Airport.

» Click here to read the rest of October 21 to October 27: This week in Denver weather history

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Winter Weather Preparedness Week recap

Saturday, October 20th, 2018 4:30am MST
Winter Weather Preparedness Week concludes. Are you ready for winter?

Winter Weather Preparedness Week concludes. Are you ready for winter?

As we have talked about this week, winter weather can be dangerous and downright deadly.  However, being prepared helps to ensure that you and your family remain safe when the snow starts to fly or other winter weather conditions occur.

It is very easy to ignore the dangers of weather – no matter the season – and find yourself saying, “I wish I would have….” Now is the time to think about how you can prepare for these conditions, before it is too late and you find yourself wishing you had.

In this sixth and final message in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com reviews the topics we covered this week and directs you to the previous articles and other resources to help you get ready.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BOULDER CO
ISSUED BY NATIONAL WEATHER SERVICE PUEBLO CO
600 AM MDT SAT OCT 20 2018

Enjoy the great outdoors in Colorado this winter season, but watch the weather.

The National Weather Service issues a variety of winter weather, outlooks, watches, warnings, and advisories, covered earlier during this Winter Weather Preparedness Week.  Safety tips were also passed along.

» Click here to read the rest of Winter Weather Preparedness Week recap

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