Thornton, Colorado, USA
UpdatedThu, 18-Oct-2018 11:00pm MDT 


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Thornton’s Thursday to offer temps close to normal, some clouds

Thursday, October 18th, 2018 5:07am MDT

A relatively quiet day today much like what we saw yesterday. Temperatures do warm up a bit and get closer to normal than we have been in quite a while.

Some clouds will be present as the sun rises then mostly sunny skies take over until the afternoon when we again will see some coverage. Winds will generally be light and out of the southeast this morning then switch to come from the north in the afternoon.

Temperatures will top out today in the low 60s, within a couple degrees of the average high for the date of 64 degrees.

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

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Life threatening winter weather – Wind chill, frostbite and hypothermia

Thursday, October 18th, 2018 4:59am MDT
Wind chill is a life threatening weather danger that is often ignored or underestimated. (AP Photo)

Wind chill is a life threatening weather danger that is often ignored or underestimated.

Winter weather can not only be trying on the mind and soul, it also presents very real dangers to the human body.  Extreme wind chills can be deadly and bring on the outset of frostbite and hypothermia.  Here in Colorado, all residents should be aware of these hazards and be prepared to deal with them.

In this fourth in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com helps you understand wind chill and how to protect yourself from frostbite and hypothermia.

600 AM MDT THU OCT 18 2018

Extreme wind chill – Potentially life-threatening and often overlooked

Extremely cold air comes every winter in at least part of the country and affects millions of people across the United States. The arctic air, combined with brisk winds, can lead to dangerously cold wind chill values. The Wind Chill Index helps you determine when dangerous conditions develop that could lead to frostbite or hypothermia. It takes into account heat loss from the human body to its surroundings during cold and windy weather. The calculation utilizes wind speed in miles per hour and temperature in degrees Fahrenheit. For example, a temperature of minus 5 degrees occurring with a 20 mph wind gives a wind chill near minus 30 degrees. This means that your body will lose heat at the same rate as it would if the air temperature were minus 30 degrees with no wind. Wind Chill values near minus 25 degrees mean that frostbite is possible within 15 minutes.

  • How does the wind affect wind chill?  See the chart below.

Frostbite is the freezing of skin and the body tissue just beneath it. It first affects exposed body tissue where blood circulation may be limited such as your fingers, toes, nose and ears. To minimize frostbite, make sure all body parts are well covered. When frostbite starts, feeling is lost in the affected area and the frozen tissue will take on a white or pale appearance. If you suspect you are experiencing frostbite, hold the frostbitten area closely against warm skin to return blood flow and warmth to the affected area.

Hypothermia is a dangerously low body temperature and is the most common winter weather killer. When you hear of a hiker, climber, hunter or a stranded traveler perishing from cold weather exposure, hypothermia was the cause. Most people are surprised to learn that hypothermia deaths can occur with temperatures between 30 and 50 degrees. If you or your clothing are wet, then hypothermia becomes even more likely.

Warning signs of hypothermia include uncontrollable shivering, memory loss, disorientation, slurred speech and drowsiness. Immediate medical attention should be given to victims suspected of suffering from hypothermia. If no help is available, the victim should be warmed slowly with warm liquids along with dry clothing and blankets.

The National Weather Service will issue wind chill advisories and warnings when a deadly combination of wind and cold air threaten. To learn more about wind chill, visit the national weather service internet site using lower case letters:  http://weather.gov/om/windchill.

When cold weather threatens, follow these tips for survival:

Stay dry, wet clothing results in much faster heat loss from your body. Wear waterproof insulated boots.

Stay covered, wear mittens or gloves and wear a hat. At least half of your body heat is lost if your head is not covered.

Dress layered, trapped air between loose fitting clothing helps to insulate.

Stay informed, have a portable NOAA weather radio nearby to keep you up-to-date with the latest forecasts and warnings. Use wind chill temperatures to guide you in dressing properly for the outdoors. On very cold days, minimize your exposure to the outdoors if possible.

Winter Weather - Extreme Cold Safety

Winter Weather - Signs of Hypothermia

Wind Chill Chart

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High winds a major threat in Colorado during the winter

Wednesday, October 17th, 2018 5:03am 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.

600 AM MDT WED OCT 17 2018


This week through October 20th 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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Wednesday temps remain a bit cool, will see more clouds and some breezy winds

Wednesday, October 17th, 2018 5:02am MDT

No significant changes in Thornton’s weather today. Temperatures will be similar to yesterday and cooler than normal but there will be some more clouds.

The day starts out with mostly clear skies then we will see a gradual increase in mid-level moisture leading to partly cloudy skies by mid-afternoon. Overall conditions will be calm although the afternoon will bring some breezy winds. Highs today will again top out in the mid-50s, about 10 degrees below normal.

Tonight, skies will be partly clear with lows close to the freezing mark.

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October 2018 top shots: Monthly photo slideshow

Wednesday, October 17th, 2018 3:45am MDT
A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)

A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)

October in Thornton can bring a wide variety of weather conditions, perfect for the photographer in all of us.

The month brings the changing of the colors at Colorado’s lower elevations and it is also is typically when we see our first freeze and first snow.

Couple those facts with our usual widely varying landscapes and wildlife and we have a month that is sure to bring in plenty of photo opportunities.

  • Slideshow updated October 17, 2018
  • To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

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Warmer temperatures, lots of sun for Thornton’s Tuesday

Tuesday, October 16th, 2018 5:05am MDT

Continued improvement in our weather today as the mercury climbs a good bit and we enjoy dry, calm conditions. This is more like what we hope to see in the fall.

The day starts out with clear skies. A few clouds will arrive around noon and be around in the afternoon and evening but they won’t be too intrusive. Overall conditions will be dry and calm. Temperatures start out chilly but then will warm up nicely toward a high in the mid-50s.

Tonight, skies remain mostly clear with lows dipping to around the freezing mark.

Enjoy! If you’re stuck inside, remember you can keep an eye on things with our live webcams here.

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Winter weather – What does that weather warning mean?

Tuesday, October 16th, 2018 4:00am 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.

600 AM TUE OCT 16 2018

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.

This statement contains warning and advisory criteria for Colorado east of the continental divide. Criteria west of the divide will be provided today in a separate issuance by the Grand Junction forecast office.


A Hazardous Weather Outlook is issued daily by each National Weather Service office serving 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 serving Colorado.

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.

Warning criteria for heavy snow is defined by the following amounts.

  • For the mountains – 8 inches of snow accumulation in 12 hours or 12 or more inches in 24 hours.
  • For the lower elevations – 6 inches of snow accumulation in 12 hours or 8 or more inches in 24 hours.

A Blizzard Warning is issued when the following conditions are expected to occur for at least 3 hours:

  • Sustained winds of 35 mph or greater.
  • Considerable falling and/or drifting snow lowering
  • Visibilities to less than a quarter mile.

A high wind warning is issued:

  • Mountains…sustained winds 50 mph or more, or gusts of at least 75 mph.
  • Lower Elevations…sustained winds of 40 mph or more, or gusts of at least 58 mph

A Wind Chill Warning will be issued for the following wind chill temperatures:

  • Mountains…minus 35 degrees Fahrenheit or colder.
  • Lower Elevations…minus 25 degrees Fahrenheit or colder.

A Dust Storm Warning will be issued for the following conditions:

  • Visibility reduced to 1/4 mile or less in blowing dust and sustained winds of 25 mph or greater for at least one hour.


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

This week is Winter Weather Preparedness Week in Colorado. Public information statements will be issued throughout the week to give safety information and help you know how to respond when winter weather threatens.

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Denver sets record low temperature for October 15

Monday, October 15th, 2018 5:14am MDT

Record Cold TemperaturesWe are set to enjoy a warm up this week but before we do that, Denver set its second record cold temperature reading in the past 24 hours.

Yesterday the Mile High City saw a record low maximum temperature. This morning, the mercury plunged to a new record low for the date.

According to the National Weather Service, Denver’s official low temperature this morning, as measured at Denver International Airport, dipped to 18 degrees.  This set a new record low for the date beating the previous record of 20 degrees set in 1970.

Here in Thornton, we matched the DIA number with a low of 18 degrees coming at 3:19am.

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Thornton’s workweek starts with a warm up but with colder than normal temperatures

Monday, October 15th, 2018 4:58am MDT

Following on yesterday’s cold and snow and this morning’s record-setting cold, we dry up and clear out Monday. Temperatures will remain a good ways below normal bit it begins a warming trend and a calm, pleasant fall week.

Clear skies greet us to start the day and will continue throughout the day with no cloud cover expected. Conditions will be calm and dry.

Temperatures start out with a record low then will steadily warm toward a high in the low to mid-40s. That is well below the average high for the date of 66 degrees but a marked improvement over yesterday.

Tonight, skies remain clear with lows dipping to the mid to upper 20s.

For the rest of the week, we expect to see lots of sun, dry and calm conditions and warmer temperatures. Check out the extended forecast here.

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Winter travel safety – Ensure you and your vehicle are ready

Monday, October 15th, 2018 4:45am 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 Governor John Hickenlooper.  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.

601 AM MDT MON OCT 15 2018

Winter Travel Safety

Winter Weather Preparedness Week continues through Saturday.  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.

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, water-proof matches, high calorie packaged food for quick energy and an empty can to melt snow for drinking.

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 an d 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 or 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 traveling in light weight or high profile vehicles should avoid travel during these strong wind events especially on north-south 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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