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Thornton, Colorado, USA
UpdatedWed, 27-Oct-2021 8:25pm MDT 
 

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Cool, calm, dry conditions for Thornton’s Wednesday

Wednesday, October 20th, 2021 4:55am MDT

A pretty typical day for this time of year. We will enjoy lots of sun and cool temperatures right near average.

Sunny skies will be the general rule throughout the day with only a cloud here and there. Winds will be light, conditions calm and dry. Look for high temperatures today right near the average high for the date of 64 degrees.

Tonight, skies remain mostly clear with overnight lows in the mid-30s.

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High winds a major threat in Colorado during the winter

Wednesday, October 20th, 2021 4:55am MDT
Winter winds can not only make it miserable to be outside, they can also be dangerous.

Winter winds can not only make it miserable to be outside, they can also be dangerous.

As we often experience, high winds in Colorado can cause conditions to deteriorate rapidly.  They present a very real danger to life and property, especially when coupled with other winter conditions like snow.

Why does it seem like we get so much wind in the winter?  What causes this?  How can you prepare and protect yourself and your property?

In this third in a series on winter weather preparedness from the National Weather Service, ThorntonWeather.com helps you understand why we receive so much wind and how to prepare for it.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BOULDER CO
ISSUED BY NATIONAL WEATHER SERVICE PUEBLO CO
600 AM MDT WED OCT 20 2021

…WIDESPREAD HIGH WINDS VISIT COLORADO DURING THE WINTER…

This week through October 23rd is Winter Weather Preparedness Week in Colorado.

The two main causes of high winds in Colorado during the cold season are the air pressure difference between strong low pressure and cold high pressure systems, and Chinook winds developing across the Front Range and other eastern mountain ranges.

» Click here to read the rest of High winds a major threat in Colorado during the winter

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Winter weather – What does that weather warning mean?

Tuesday, October 19th, 2021 5:00am MDT
You have seen and heard the warnings but do you know what they really mean?

You have seen and heard the warnings but do you know what they really mean?

We all are familiar with the crawls on the TV screen or the announcements on the radio for winter weather advisories such as Winter Storm Watch, Blizzard Warning, Freeze Warning and more. But, how many of us really know what those mean? There is very specific criteria the National Weather Service follows in issuing these watches and warnings and there are important differences between all of them.

In this second in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com helps you understand what all of these mean so you can be better prepared.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BOULDER CO
600 AM TUE OCT 19 2021

From the National Weather Service:

What does that warning mean?

When a warning is issued during the winter season, will you know what it means, and will you know how to respond? During this Colorado Winter Weather Preparedness Week, please become familiar with our list of potentially life-saving winter weather products.

OUTLOOKS

A Hazardous Weather Outlook is issued daily by the National Weather Service office in Boulder Colorado. The outlook provides information on potentially hazardous weather out to 7 days into the future. Also, the Weather Story, a graphic of expected hazardous weather, is posted daily on National Weather Service web sites.

WATCHES AND WARNINGS

A Winter Storm Watch is issued when hazardous winter storm conditions are possible within the next 3 to 4 days, but the timing, intensity, or occurrence may still be uncertain. In contrast, a Winter Storm Warning is issued for potentially life-threatening winter storm conditions, such as heavy snowfall or a combination of snowfall and blowing snow, which are likely to occur within the next 1 to 2 days. Impacts such as timing of winter weather on rush hour are also considered when issuing Watches and Warnings.

Winter Storm
Plains: 6″ in 12 hours, 8″ in 24 hrs
Mountains: 8″ in 12 hours, 12″ in 24 hours
And Impacts

Winter Weather Advisory
Plains: 3-6″ in 12 hours, 4-8″ in 24 hours
Mountains: 4-8″ in 12 hours, 6-12″ in 24 hours
And Impacts

Blizzard
Sustained wind or frequent gusts 35 mph or greater, AND
Considerable falling/blowing snow with visibility less than 1/4 mile, FOR at least 3 hours

ADVISORIES

Advisories for winter weather are issued for potentially hazardous conditions which are considered more of a nuisance than a life-threatening situation. However, if caution is not taken the advisory events could become life-threatening. Impacts such as timing of winter weather on rush hour are also considered when issuing Advisories.

Winter Weather Preparedness Week in Colorado will continue through Saturday.

Winter weather watches and advisories.

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Tuesday brings cooler temperatures, breezy winds

Tuesday, October 19th, 2021 4:54am MDT

A system passing to our north will help to mix things up a bit today. While we will remain dry, it will be a good bit cooler and some breezy winds will be seen.

Mostly sunny skies start us off early. Cloud cover will then increase but we will still be seeing some blue for the balance of the day. High temperatures will top out around the 60 degree mark. Winds will be light initially then begin increasing by mid-morning. Breezy winds will then continue into the early evening.

Tonight, winds will ease and skies will be mostly clear. Overnight lows will be down near the freezing mark.

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Mild temperatures, some breezy winds start Thornton’s workweek

Monday, October 18th, 2021 5:20am MDT

We will continue this past weekend’s mild weather right into today as we enjoy another pleasant, fall day.

Mostly sunny skies will be above throughout the day although there will be some varying levels of cloudiness. Highs will top out in the mid-70s.  The mid to late afternoon will see some breezy winds.

Tonight, partly clear skies will be above with temperatures dropping to the low 40s.

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Winter travel safety – Ensure you and your vehicle are ready

Monday, October 18th, 2021 5:05am MDT
Are you and your vehicle ready for the winter weather ahead?

Are you and your vehicle ready for the winter weather ahead?

Before hitting the road, Coloradans need to ensure that they and their vehicles are prepared should inclement weather strike.

ThorntonWeather.com presents the first in a series from the National Weather Service (NWS) as part of Winter Weather Preparedness Week has declared by Colorado’s Governor.  Check back throughout the week for more winter preparedness stories.

Today’s message from the NWS highlights the importance of having a proper emergency kit in your vehicle and should the worst-case scenario occur where you get stuck, what you should do to survive.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
601 AM MDT MON OCT 18 2021

Winter Travel Safety

Winter Weather Preparedness Week continues through Saturday October 23rd. Preparedness is a big part of this campaign. Before winter weather arrives in earnest, it is highly recommended that you prepare your car or truck for winter travel. This includes a winter survival kit and good snow tires.

Before winter weather arrives in earnest, it is highly recommended that you prepare your car or truck for winter travel.

A well-equipped vehicle has adequate tires, tire chains, tow rope, sand or cat litter for traction, shovel, tool kit, windshield scraper and brush, battery cables, first aid kit, flashlight, extra batteries, blankets and/or sleeping bags, extra clothing, candles, waterproof matches, jug of water, high calorie packaged food for quick energy, and an empty can to melt snow for drinking.

And during winter weather events, the best way to prevent treacherous winter travel is to avoid it. This can be done by staying informed about current weather and road conditions as well as the latest weather forecasts. Information on road conditions in Colorado is available on the web at www.cotrip.org or from the toll free number 1-877-315-7623. When calling from anywhere in Colorado, dialing 511 will also access the Colorado road reports. Additionally, a free smartphone application, CDOT Mobile, is available.

If you should become stranded during a winter storm, stay with your vehicle and do not panic. If accompanied by others, take turns sleeping. Run the motor every hour for about ten minutes to maintain warmth, but keep windows open a little to prevent the buildup of carbon monoxide. Make sure the exhaust pipe is not blocked. Keep the car visible with brightly colored cloths tied to the side view mirrors, door handles, or external antenna. At night, turn on the dome light when running the engine. Exercise periodically by vigorously moving arms, legs, toes and fingers.

In the mountains, avalanches become a possibility in the winter, especially below steep slopes. Avalanches occasionally come down across roads, with little or no warning. However, avalanche control work is performed on many avalanche prone roads in Colorado, making the roads safer to travel. Caution is advised when traveling along avalanche prone roads, especially during and shortly after a heavy snowstorm, as well as during periods of rapid snowmelt.

Very strong downslope winds occur at times mainly along the front range of Colorado. These Chinook and Bora winds can have gusts exceeding 100 mph. Persons planning travel in lightweight or high-profile vehicles should avoid travel during these strong wind events especially on northsouth oriented roads.

Roads which appear to be clear in the wintertime may actually be coated with a thin layer of ice, commonly known as black ice. This nearly invisible ice layer can cause you to rapidly lose control of your vehicle. Black ice is most common during the nighttime hours. If you detect black ice you should reduce your speed.

Please follow these winter travel safety recommendations which could save your life.

 

Winter Weather Awareness Week - Winter Travel Safety. (National Weather Service)

Winter Weather Awareness Week – Winter Travel Safety. (National Weather Service)

 

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October 17 to October 23: This week in Denver weather history

Sunday, October 17th, 2021 9:54am MDT

This Week in Denver Weather History

This year Denver is still waiting for its first snowfall but that certainly has not been the case throughout history.  Many times in our past we have seen not only snow around this time of October but heavy snow as well, oftentimes damaging in nature.

15-17

In 1989…an autumn snowstorm hit metro Denver with 2 to 6 inches of snow.  Snowfall totaled 4.4 inches at Stapleton International Airport where the maximum snow depth on the ground was only 3 inches due to melting and north winds gusted to 25 mph on the 15th.  The heavy wet snow caused leafy branches to sag onto power lines…resulting in a number of power outages.  Five thousand homes were blacked out in Boulder on the 16th.  Up to a foot of snow fell in the higher foothills with 19 inches recorded at Echo Lake.

16-17

In 1990…strong downslope winds raked the eastern foothills. Wind gusts from 60 to 75 mph were common.  Strong winds in metro Denver resulted in wave damage to a dock used to moor several private sail boats at Cheery Creek Reservoir. Damage was confined to the dock and two anchor cables. A northwest wind gust to 43 mph was recorded at Stapleton International Airport.

17

In 1878…strong winds reached sustained speeds of 48 mph.

In 1988…a wind gust to 62 mph was recorded in central Boulder.  The strong winds caused a few brief power outages.  An old smoldering brush fire in the foothills west of Boulder was re-ignited by the wind gusts.

In 1994…winds gusted to 85 mph atop Squaw Mountain…5 miles south of Idaho Springs.

In 2006…a potent storm system brought heavy snowfall to the mountains and eastern foothills.  Snowfall totals in the foothills included:  14 inches at Blackhawk…13.5 inches near Idaho Springs…13 inches at cabin creek…12.5 inches at Aspen Springs and Echo Lake…11.5 inches at Georgetown and Rollinsville…10.5 inches near Jamestown…and 10 inches at grant and Lake Eldora.  Lesser snow amounts…from 4 to 9 inches…were recorded elsewhere in the foothills.  Snowfall totaled only 3.5 inches in the Denver Stapleton area.  At Denver International Airport…north winds gusted to 31 mph.

In 2012…A brief but powerful windstorm associated with a fast moving cold front across the Urban Corridor and adjacent plains during in the evening. Peak wind gusts ranging from 58 to 71 mph downed trees and power lines which damaged homes and vehicles. Several temporary structures were also damaged. Approximately fifty thousand were left without power in the Denver…Fort Collins and Greeley areas. Some schools were closed the following day until power could be restored. Around the Denver area…peak wind gusts included: 69 mph in Golden…64 mph at Littleton… 62 mph at Buckley AFB and in Denver…near the intersection of Walnut St. and Interstate 25…and Longmont; 59 mph at Centennial Airport…58 mph at Denver City Park…Highlands Ranch. At Denver International Airport…a peak wind gust to 35 mph was observed from the northwest.

17-19

In 1908…a moist…heavy…wet snowfall totaled 13.0 inches in downtown Denver over the 3 days.  Rain from early morning on the 17th changed to snow by late afternoon and continued through the late morning of the 19th.  Due to temperatures in the 30’s and melting…the most snow on the ground was only 5.0 inches at 6:00 pm on the 18th.  Northwest to northeast winds were sustained between 12 and 20 mph during the storm.  Precipitation totaled 1.82 inches.

» Click here to read the rest of October 17 to October 23: This week in Denver weather history

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Colorado Winter Weather Preparedness Week introduction

Sunday, October 17th, 2021 5:30am MDT
Don't be caught off guard by winter weather! Remember the Christmas Eve Blizzard of 1982? Be prepared!

Don’t be caught off guard by winter weather! Remember the Christmas Eve Blizzard of 1982? Be prepared!

Winter weather in Colorado can be an inconvenience but more than that it can be deadly.  Emergency preparedness for major winter storms – as well as for other types of severe weather – is an important part of living in a state where conditions can change wildly from one moment to the next.

To help raise awareness of the need to be prepared for these occasions, the week of October 18th to October 24th has been proclaimed Winter Weather Preparedness Week in Colorado.

The National Weather Service will be issuing Public Information Statements each day this week to highlight the dangers of winter weather and how best to be prepared.  ThorntonWeather.com will be posting these important messages here to help you be prepared.  Please take the time to read and heed these messages – your life and the lives of your loved ones could depend on it.

  • Stay up to date with Thornton’s weather: ‘Like’ us on Facebook and follow us on Twitter.

From the National Weather Service:

Public Information Statement
National Weather Service
Grand Junction CO

..Winter Weather Preparedness Week in Colorado…

The week of October 17th through October 23rd is Winter Weather Preparedness Week in Colorado. This is an excellent time for all individuals, families, businesses, schools, and media outlets to review their winter storm preparedness plans. It is especially important for all new arrivals to the state to become familiar with the National Weather Service watch and warning definitions, as well as winter safety procedures.

Snow in Colorado is important to the farmers, the ski areas, and for filling up reservoirs. However, winter storms often bring heavy snow, bitter cold air, high winds, low visibilities and slick roads. This can lead to dangerous travel conditions and other life threatening situations such as avalanches and very frigid wind chill temperatures.

To help you prepare for these hazards this coming winter…the National Weather Service will issue statements throughout the week to discuss:

Intro Winter Weather Preparedness Week
Part 1 Winter travel safety
Part 2 Watches…warnings…and advisories
Part 3 High winds
Part 4 Wind chill temperatures and hypothermia
Part 5 Avalanche safety
Review Winter Weather Preparedness Week review
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Thornton to enjoy pleasant, fall weather conditions for the weekend

Friday, October 15th, 2021 6:34am MDT

Fall weather doesn’t get a whole lot better than what we see for the three-day period. While it starts on the cool-side, Saturday and Sunday look to be near perfect.

For Friday, sunny skies will be above with calm, dry conditions. Highs will be below normal and top out in the mid-50s as yesterday’s system moves out. Tonight, skies remain clear with overnight lows around freezing.

Saturday sees things start to warm up. Sunny skies will be above with highs in the mid to upper 60s. Saturday night, lows will drop to the mid-30s under clear skies.

Sunday will be the warmest and nicest day of the period. Highs will reach the low to mid-70s with sunny skies above.

Enjoy!

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Chilly temperatures, rain and perhaps our first snow of the season on Thursday

Thursday, October 14th, 2021 5:11am MDT

Thornton is about to be hit by a fast-moving storm system that will serve to deliver a shot of cold and may give us our first taste of snow for the season.

We start off the day with chilly temperatures and a Frost Advisory in effect until 9:00am.

Partly cloudy skies will be with us this morning then cover will increase in the afternoon and evening. Highs today will top out only in the upper 40s. We will hit our high right around noon and then temperatures will be dropping.

Light rain will be possible after noon and through the evening. Best chances come from about 3:00pm to 8:00pm.

Tonight, with temps at or below freezing, we begin to see a chance for snow at about 8:00pm until 11:00pm. Should the white stuff come, only minimal accumulations are expected.

Cloud cover will begin to dissipate after midnight leading to cold temperatures in the mid to upper 20s. As a result, a Freeze Warning is in effect from midnight until 9:00am tomorrow.

While these initial shots of cold for the season are a bit of a shock to the system, we will be rebounding nicely with a pleasant, fall weekend ahead.

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