Thornton, Colorado, USA
UpdatedSun, 19-May-2019 5:30am MDT 


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Cool temperatures, a good bit of cloud cover start off Thornton’s workweek

Monday, March 18th, 2019 4:58am MDT

A passing weak system will serve to impact our weather today. Temps will be below normal and we will have some cloud cover above.

Partly clear skies start us off and will be with us through much of the day. The mid-afternoon will see an increase in clouds. Winds will be generally light and out of the north.

Temperatures start out chilly and below freezing then will head toward a high in the mid-40s.

Tonight, mostly cloudy skies will be above with overnight lows in the upper 20s.

What lies ahead for the rest of the week? Find out in our extended weather forecast here.

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Thornton’s weekend to offer calm conditions, gradually warming temperatures

Friday, March 15th, 2019 4:57am MDT

A three day period of calm and dry conditions ahead for us. Temperatures will be warming but remain below normal as we work to scour out the lingering cold air and snow cover.

Friday will bring us sunny skies with perhaps a few high, thin clouds. Highs today will be near the 40 degree mark. Tonight, skies will be mostly clear with lows around 20 degrees.

Tomorrow, temperatures continue improvement with highs in the mid-40s. Sunny skies and calm conditions can again be expected.

The weekend closes out on Sunday with the warmest day of the period. Highs will push close to the 50 degree mark with a good dose of sun above.

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Thornton’s March blizzard ends but the cold and wind will linger

Thursday, March 14th, 2019 4:36am MDT

Well, that was quite the interesting day yesterday, eh? We received a healthy 6.2 inches of snow and coupled it with miserable wind. The snow has ended but Thursday will see the weather being slow to recover with cold temperatures and wind sticking around.

The day starts with cloudy skies. There will some, gradual improvement in the skies as the day progresses with some hints of blue later. Winds are going to continue to be quite breezy with gusts to 30mph lasting for much of the day before easing up after mid-afternoon.

High temperatures today will only be around the freezing mark. Wind chills will make it feel much colder.

Tonight, clouds will be decreasing with lows in the low teens.

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Most significant storm of the season set to hit Thornton, potentially bring blizzard conditions

Wednesday, March 13th, 2019 5:06am MDT

The much-discussed winter storm is now descending on eastern Colorado. All indications are that the nasty, winter weather conditions we were expecting will occur and create hazardous conditions.

The first part of the morning will see rain and a rain / snow mix. Currently the transition to all snow is expected to occur by mid-morning. At that time, moderate to heavy snow will seen.

The snow will be coupled with powerful winds with gusts potentially exceeding 50 mph. This will create drifting snow and limit visibility greatly.

Total snow accumulations for Thornton look to be in the 4 to 7 inch range, perhaps a bit more depending on how things play out.

Our high temperature for the day was already seen and the mercury will decrease through the day.

By 5:00pm we will be down to the mid to upper 20s. Snow should start to ease after about 5:00pm with only light snow seen after that and lasting through much of the night. Strong wind will continue overnight. Look for lows tonight to dip to the mid-20s.

A Blizzard Warning is in effect from 10:00am until midnight. Do not travel if you do not need to!

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Thornton’s March 2019 blizzard – Live social feed

Tuesday, March 12th, 2019 3:22pm MDT

ThorntonWeather.com on Facebook, Google+ and TwitterToday, March 12, 2019, we saw our warmest temperatures in more than a month.  Tomorrow, we are expecting a significant storm that may bring blizzard conditions.  That is springtime in Colorado!

The National Weather Service has issued a Blizzard Warning which will be in effect from 10:00am Wednesday until midnight Wednesday.  Road conditions are expected to deteriorate and school and business closings seem likely. Power outages are another concern with the wind and heavy snow that is expected.

Throughout the period we will of course be monitoring the system and posting regularly to our Facebook page and Twitter feed.  You can follow along in real time below.  We are also on Google+ here.

For comprehensive look at the storm, please monitor our Winter Weather Briefing page.


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Tuesday offers the warm before the storm with mild temps as we await our next snow

Tuesday, March 12th, 2019 5:08am MDT

As we all have come to know and love about Colorado, the next couple of days will provide stark contrasts in weather for Thornton. Today will see unseasonably warm temperatures which will soon be followed by what may be a significant snowstorm.

For today, partly clear skies start us off then we will see some clearing leading to mostly sunny skies for the morning. The afternoon and evening then see an increased in cloud cover.

Winds will be light and out of the north. Temperatures will push toward a high near the 60 degree mark, well above the average high of 51 degrees for the date.

Ahead of the coming low pressure system, this evening some light rain showers will be possible and likely after midnight. Overnight lows tonight will be in the mid-30s.

As for the coming storm, a Winter Storm Watch will be in effect from noon Wednesday to midnight Wednesday. The National Weather Service warns that moderate to heavy snow during the period coupled with strong winds will create hazardous conditions, particularly Wednesday afternoon and evening.

Rain tomorrow morning will make a switch to snow in the late morning / early afternoon and the afternoon commute tomorrow looks to be a rough one as a result. Here in Thornton, we are thinking 3 to 6 inches is looking likely at this time between Wednesday and Thursday morning. This will be coupled with wind gusts during the day tomorrow that could push to 50 mph.

As always, track and timing remain the wildcards and we are still 24 hours or so from this system hitting in earnest. For us, the transition from rain to snow and when that occurs may serve to increase or decrease any potential snowfall totals. An earlier transition tomorrow morning will drive up totals, a later start will offer lower totals.

Almost certainly, the biggest impacts are going to be on the eastern plains where blizzard conditions will occur.

Read the complete text of the watch here.

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Monday begins Thornton’s workweek with temps near normal, some clouds

Monday, March 11th, 2019 5:11am MDT

Following on what was a pretty pleasant weekend, we continue to see temps right near seasonal norms today. All eyes remained focused though on the mid-week potential for a snowstorm.

For today, mostly clear skies start us off but cloud cover will be increasing this morning leading to partly sunny skies for much of the day. Winds will be generally light and out of the north. Temperatures will top out around 53 degrees, a bit above normal for the date.

This evening brings just a slight chance for a rain shower but if they do materialize, they aren’t expected to amount to much. Mostly cloudy skies will be above overnight with lows around the freezing mark.

We continue to monitor an approaching system that will arrive Wednesday and bring a return of colder temperatures and some snow. As always with these systems, track and timing become critical and with 48 hours to go, much is still up in the air. However, the potential is there for a pretty significant even and it would be wise to start planning accordingly.

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March 10 to March 16: This Week in Denver Weather History

Sunday, March 10th, 2019 5:12am MDT
This week in Denver weather history

March 10 to March 16: This Week in Denver Weather History

Heavy, wet snow is the hallmark of March in Denver and we see many events containing just that in our look back at this week in Denver weather history.

From the National Weather Service:


In 1989…unusually warm weather set four daily temperature records in Denver. The high temperature of 74 degrees on the 8th exceeded the record. Records were equaled on the 9th with a high of 77 degrees and the 10th with a high of 79 degrees. The low temperature of 42 degrees on the 10th set a new record high minimum for the date.


In 1904…strong Chinook winds raked the city for 2 days. On the 9th…west winds sustained to 53 mph with gusts to 62 mph warmed the temperature to a high of 55 degrees. On the 10th… West winds were sustained to 48 mph with gusts to 54 mph. The high temperature was 58 degrees.

In 2013…a storm system brought heavy snow to areas in and near the Front Range Mountains and Foothills where storm totals included: 13 inches at Berthoud Pass SNOTEL…12 inches at Arapahoe Ridge; 11 inches…5 miles southwest of Golden; 10.5 inches near Kittridge; 10 inches at Lake Eldora and Pine Junction; 9.5 inches near Conifer…9 inches…near Bailey and 9 miles east-northeast of Nederland…Joe Wright and Strontia Springs. Along the Urban Corridor…some storm totals included: 8.5 inches at Highlands Ranch and near Morrison; 8 inches in Arvada; 7 inches…5 miles northeast of Westminster; 6.5 inches at Centenniel…Lone Tree and Wheat Ridge; 6 inches in West Denver…Hygiene…Lyons and Thornton…5.5 inches in Broomfield; with 5 inches in Aurora and the former Stapleton International Airport. Across the Palmer Divide and northeast plains of Colorado…storm totals ranged anywhere from 2 to 10 inches. The combination of snow and strong wind produced blizzard conditions and forced the closure of Interstate 70 east of Denver. Sustained winds of 25 to 35 mph with gusts to 45 mph produced near zero visibilities at times and snowpacked roads. Snowdrifts from 2 to 4 feet deep were reported. As a result…many of the roadways became impassable. Officially…Denver International recored 5.4 inches of snowfall on the 9th. In addition…a peak wind gust to 38 mph was observed from the north.


In 1927…rain changed to heavy snow behind a cold front and totaled 7.7 inches over downtown Denver. North winds were sustained to 37 mph with an extreme velocity to 38 mph on the 11th.

In 1955…a strong windstorm raked the eastern foothills. A wind gust to 95 mph was recorded at Rocky Flats with a gust to 60 mph measured at Valmont. Damage in Boulder totaled 10 thousand dollars. Minor injuries also occurred. The strong winds were associated with a vigorous cold front that produced northwest winds at 40 mph with gusts as high as 52 mph at Stapleton Airport where the visibility was briefly reduced to 3/4 mile in blowing dust on the 10th.

In 1968…5.5 inches of snow fell at Stapleton International Airport where northeast winds gusted to 24 mph on the 10th.


In 1906…an extended cold and blustery period occurred with light snow totaling 14.4 inches over 11 consecutive days. The greatest amount of snow on a single day was 4.0 inches on the 15th. Only a trace of snow fell on the 12th and 17th. High temperatures were below freezing for the entire period. The coldest were 14 degrees on the 16th and 18 degrees on the 17th. Both readings were record low maximums for the dates. Low temperatures were mostly in the single digits. The coldest were 2 degrees below zero on the 16th and 5 degrees below zero on the 19th. Northeast winds were sustained to 22 mph on the 9th. North winds were sustained to 36 mph on the 10th…32 mph on the 13th…and 22 mph on the 15th.


In 1893…northwest winds were sustained to 48 mph with gusts to 60 mph in the city.

In 1948…the high temperature warmed to only 6 degrees… The all-time record low maximum for the month of March. The same reading also occurred on March 6…1920.

In 1970…5.0 inches of snow fell at Stapleton International Airport where north winds gusted to 21 mph.


In 1886…snowfall of 3.5 inches was measured in downtown Denver. Apparent post-frontal north winds were sustained to 43 mph on the 11th.

In 1977…a major blizzard struck metro Denver. Snowfall totaled 8.0 inches at Stapleton International Airport where north winds at speeds of 30 to 40 mph with gusts to 60 mph frequently reduced visibilities in blowing snow to 1/4 mile or less. Most of the snow…7.7 inches…fell on the 10th. The snow ended by daybreak on the 11th…but strong north winds persisted through the day.

In 1988…a late winter storm produced heavy snow and wind… Mainly north of Denver. Wind gusts reached 62 mph at Keenesburg and produced a lot of blowing snow…closing schools in southwest weld County. The storm closed I-70 east of Denver. Only 1.1 inch of snow fell at Stapleton International Airport…but north winds gusted to 39 mph.


In 1924…snowfall was heavy and totaled 9.9 inches over downtown Denver. North winds were sustained to 18 mph on the 11th.

In 2001…heavy snow fell over northeast Colorado and metro Denver when a combination of upslope winds and convective snow bands formed over the area. Storm totals included: 11 inches at the Eldora Ski Resort; 10 inches at Genesee; 8 inches at Elizabeth…atop Lookout Mountain…near Sedalia… And at Strasburg; 7 inches near Castle Rock and Evergreen; and 6 inches in Aurora…atop Crow Hill…and in Parker. Elsewhere across metro Denver…snowfall ranged from 2 to 5 inches with 3.9 inches at the site of the former Stapleton International Airport. North winds gusted to 28 mph at Denver International Airport on the 10th.


In 1896…northwest winds were sustained to 40 mph with gusts to 56 mph.

In 1991…the passage of a strong pacific cold front produced winds in excess of 60 mph across metro Denver. Blowing dust reduced the visibility to 2 miles at Stapleton International Airport where northwest winds gusted to 49 mph. A blizzard across eastern Colorado closed I-70 from Watkins to the east…but Denver escaped the storm with only a trace of snowfall.


In 1929…heavy snowfall totaled 9.3 inches in downtown Denver. Northwest winds were sustained to 31 mph with gusts to 34 mph on the 11th.

In 1947…heavy snowfall totaled 7.0 inches in downtown Denver. North winds were sustained to 15 mph on the 11th.

In 1963…snowfall totaled 5.8 inches at Stapleton International Airport where north-northwest winds gusted to 25 mph on the 11th.

In 1993…a strong storm dumped heavy snow in the mountains and 4 to 8 inches of snow over metro Denver. Snowfall totaled 3.6 inches at Stapleton International Airport where north winds gusted to 35 mph.

» Click here to read the rest of March 10 to March 16: This Week in Denver Weather History

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Colorado Flood Safety and Wildfire Preparedness Week in Review

Saturday, March 9th, 2019 6:00am MDT
Colorado Flood Safety and Wildfire Preparedness

Colorado Flood Safety and Wildfire Preparedness Week, March 15 – 21, 2015.

Floods and wildfires are arguably the two most common disasters Coloradans face with numerous such events occurring each year.  To better prepare residents for the danger of these disasters, this week is Colorado Flood Safety and Wildfire Preparedness Week.

Each day this week the National Weather Service will be posting public information statements covering a number of different topics about floods and wildfires.  These important messages should be required reading for all Coloradans so they know what to do to prepare for these events and handle them when they occur.

ThorntonWeather.com will be posting each of these messages as a service to our readers.  The first of these messages is below.  Check back each day this week for further topics.

600 AM MDT SAT MARCH 9 2019


Colorado has more than its fair share of floods, flash floods, and wildfires. During the past week, in our effort to build a Weather-Ready Nation, we have presented information to you on how to stay safe and minimize property damage during flood and wildfire threats.

When a flash flood warning is issued for your area, you need to quickly move to higher ground out of drainages or other low spots. It may be just a short run or climb to that higher ground.

Nearly half of all flash flood fatalities occur in vehicles. Do not drive through a flooded roadway. Instead turn around…do not drown. The water may be much deeper than you think, because it may not be possible to see below the surface of flood waters that the roadway has been washed away. One to two feet of water will carry away most vehicles. Additional flood safety information can be found at www.floodsafety.noaa.gov

Areas burned by wildfires are highly susceptible to flash floods, especially within the first two or three years after the wildfire has occurred. Wildfires by themselves destroy much property and occasionally result in fatalities within Colorado. There are actions you can take to protect yourself and minimize the wildfire threat to your property.

If you live near or within a forest or rangeland, you are encouraged to make a defensible space around your home and other structures. Information on how to make a defensible space around your home can be found on the Colorado State Forest Service website at http://csfs.colostate.edu/pages/defensible-space.html

River flooding from snowmelt or persistent rainfall can cause extensive damage to property. There are estimated to be 65 thousand homes and 15 thousand commercial, industrial, and business structures in identified floodplains within Colorado. FEMA has online maps that show if you are in a flood risk area. To access those maps, go to https://msc.fema.gov

If you live in a flood prone area, buying flood insurance is the best thing you can do to protect your home, your business, your family and your financial security. To find an insurance agent and obtain other flood insurance information, go to FEMA’s National Flood Insurance Program web site at www.floodsmart.gov

As a reminder, there is generally a 30-day waiting period from the time a flood insurance policy is purchased to when it goes into effect.

Additional information on floods and wildfires is available from your local National Weather Service web sites…

http://www.weather.gov/denver NWS Denver/Boulder web site
http://www.weather.gov/pueblo NWS Pueblo web site
http://www.weather.gov/goodland NWS Goodland web site
http://www.weather.gov/gjt NWS Grand Junction web site


Colorado Flood Safety and Wildfire Preparedness Week

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Thornton’s weekend to start with a chance for showers, then offer some wind, cool temps.

Friday, March 8th, 2019 5:11am MDT

Not a particularly extraordinary three day period of weather for us. It starts with temps near normal and a chance for showers then moves to cooler temps and a good dose of wind before settling down Sunday.

For today, partly clear skies will be above with varying levels of cloud cover. Temperatures will top out near the 50 degree mark. The afternoon brings a slight chance for a rain shower, perhaps some thunder.

As temperatures cool, the evening could see a few flakes of snow. Overnight, winds will be picking up and skies will see some clearing. Lows will be in the mid-20s.

Saturday is going to offer the most sun of the period but also the most wind. Sunny skies will be above throughout with highs reaching the mid to upper 40s. A strong pressure gradient will lead to breezy winds throughout the day.

Saturday night into Sunday, winds will ease under partly cloudy skies. Lows will be near 20 degrees.

We close out the weekend on Sunday with the coolest day of the weekend. Highs will be the low to mid-40s under partly sunny skies.

Have a fantastic weekend!

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