Thornton, Colorado, USA
UpdatedThu, 19-Jan-2017 6:40pm MST 


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Thornton’s Wednesday brings temps a bit above normal, chance for storms

Wednesday, August 17th, 2016 5:11am MST

Our weather forecast for today looks quite a bit like the weather we experienced yesterday. High temps will again be a few degrees above average and the afternoon and evening offer another chance for thunderstorms and showers.

We start out the day with mostly sunny skies that will be with us for much of the morning. Clouds will increase a bit around noon and into the afternoon. Highs today should top out right near the 90 degree mark, 3 degrees above the average for the date.

After noon and into the evening we may see some high based storms similar to yesterday with gusty winds and brief, heavy rain being the biggest threat.

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Firenado captured on video at Beaver Creek Fire

Tuesday, August 16th, 2016 3:57pm MST

WildfiresThus far, Colorado has been fortunate with relatively few large wildfires. The one notable exception is the Beaver Creek Fire where a firefighter recently captured video of a ‘firenado.’

Also called a fire whirl, a firenado occurs when the rising heat from the blaze meets whirling winds.  The effect and appearance is much like a tornado – but made of fire and ash instead of dust and debris.  Check out the amazing video below.

As of today, the Beaver Creek Fire has scorched over 36,000 acres since it started on June 19th.  Burning northwest of Walden near the Colorado / Wyoming border, the blaze is only 44 percent contained and full containment isn’t expected until cooler temperatures arrive late next month into October.

Click here for the latest details on the blaze from Inciweb.

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Near normal temps, slight chance for storms Tuesday

Tuesday, August 16th, 2016 5:04am MST

Near normal temps, slight chance for storms Tuesday. Today brings weather conditions pretty typical for this time of year. Temperatures will be right near average and the afternoon brings just a slight chance for thunderstorms.

We start out the day with mostly sunny skies above and those will be with us until this afternoon when a bit more cloud cover arrives. Thornton can expect a high temperature around 89 degrees this afternoon.

There is some moisture aloft however lower levels are quite dry which will make any sort of real thunderstorm activity difficult to generate. Any storms that do form will likely be high based and bring more wind than anything.

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Thornton’s workweek starts out very warm, more of the same for much of the week

Monday, August 15th, 2016 5:16am MST

Monday is going to bring conditions very similar to what we saw yesterday with mercury readings at or just above normal. Similar conditions can be expected for most of the rest of the workweek before we cool down for Friday and the weekend.

For today we start with sunny skies then will see a slow, gradual increase in clouds but still with some sun above this afternoon.  Temperatures will be climbing to a high of around 91 degrees (normal is 88 degrees).  We do see just a slight chance for thunderstorms after 4:00pm however even if these do develop, they aren’t expected to bring much more than gusty winds.

Looking ahead at the rest of your week, Tuesday, Wednesday and Thursday look to be quite similar to today.  A series of cold fronts is expected to arrive starting Thursday night and that will lead to cooler temperatures through the weekend. More in our extended forecast here.

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Thornton’s weekend weather to offer comfortable temps, typical PM storms

Friday, August 12th, 2016 5:27am MST

We are set to enjoy what should be a nice late summer weekend pretty typical for this time of year. Mercury readings are going to be just a bit below normal and there will be a couple of chances for thunderstorms.

Friday starts out with clear skies and calm conditions. By mid to late morning a few clouds will be arriving and with them the afternoon brings a slight chance for thunderstorms. Highs today will be topping out in the mid-80s.

Saturday will be similar to today but with a better chance for storms. Highs tomorrow will be topping out in the mid-80s under mostly sunny skies. Afternoon brings a chance for thunderstorms.

We close out the weekend on Sunday with the calmest and warmest of the three days. Temperatures will be a couple of degrees warmer with a healthy dose of sun above. At this time, we aren’t expecting any thunderstorms that day.

Have a great weekend!

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Temps get closer to normal Thursday, another chance for storms

Thursday, August 11th, 2016 5:10am MST

Courtesy of a series of fronts moving through today we will see a bit of a decrease in temperatures today. Then, the next couple of days get even cooler to be followed by a warming up back toward normal.

For Thursday we start with a little bit of cloud cover and will see partly sunny skies for most of the day. Temperatures will be climbing to a high right around 90 degrees, a couple of degrees above average for the date.

Some thunderstorm activity is expected in the afternoon with the best chances coming in the evening and after dark.

Live weather gauges here.

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Thornton’s Tuesday brings climbing temps, only a slight chance for storms

Tuesday, August 9th, 2016 5:03am MST

Hopefully you have enjoyed the cooler temperatures of recent days because today the mercury returns to above normal levels. The good news is that it won’t last long and cooler weather will return for the latter part of the week.

For today we start the day with sunny skies. Those will be followed by a few clouds slowly building as the day progresses but still with a healthy dose of sun above. Temperatures will be climb to a high today in the low to mid-90s; this versus the average for the date of 89 degrees.

A few, isolated thunderstorms may pop up in the mid to late afternoon but coverage is not expected to be great.

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Seasonal temperatures, slight chance for storms for Thornton’s Monday

Monday, August 8th, 2016 5:12am MST

A pretty typical August day ahead for us. We’ll see mercury readings right near the average of 89 and the afternoon brings the possibility of a thunderstorm or two.

We start out the day with partly sunny skies above and will see similar sky conditions throughout the day. Look for today’s high to top out right near 90 degrees. This afternoon and evening offer up some widely scattered thunderstorm activity for the Front Range.

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August 7 to August 13: This week in Denver weather history

Sunday, August 7th, 2016 4:12am MST
This Week In Denver Weather History

August 7 to August 13: This week in Denver weather history

As we get further into the month of August severe weather is less common. It can however still strike as we see in our look at this week in Denver weather history. Everything from torrential rains to massive hail and even a tornado have been reported.

From the National Weather Service:


In 1948…a brief west moving tornado was sighted 3 miles north-northeast of Stapleton Airport. The white funnel silhouetted against a gray cloud background was very narrow…nearly vertical…and estimated at nearly 5 thousand feet high. A dust cloud formed on the ground around the funnel. No damage was reported.

In 1952…a thunderstorm wind gust to 52 mph was recorded at Stapleton Airport.

In 2014…severe thunderstorms produced large hail across western and southern parts of metro Denver. Near Centennial and Golden…hail up to quarter size was reported. Near Bennett…a peak thunderstorm wind gust to 65 mph was also reported. At Denver International Airport…a peak wind gust to 46 mph was recorded.


In 1874…swarms of grasshoppers invaded the city. Millions of them were seen cruising through the air. The insects were apparently picked up by a thunderstorm gust front and carried into the city. The grasshoppers had ravaged crops in surrounding counties for the last month.

In 1878…the highest temperature ever recorded in Denver…105 degrees…occurred at 3:20 pm. This temperature was equaled on July 20th in 2005.

In 1969…the temperature reached 100 degrees at Stapleton International Airport.

In 1976…in Thornton…a 13 year old boy riding a bicycle was struck and killed by lightning.

In 2000…lightning struck three homes in central Arapahoe County east of Denver. Damage was estimated at 47 thousand dollars.

In 2003…hail to 1 inch in diameter pelted Denver. Hail to 7/8 inch was measured in Boulder.

In 2008…heavy rain also caused flash flooding over south Denver and its nearby suburbs. Heavy rain…from 2.5 to 4 inches…fell in less than 90 minutes. Firefighters rescued 20 people as the water quickly rose along creeks…flooded roadways…and stranded motorists. Three people had to be rescued along Cherry Creek when the bike path flooded.

In Evergreen…a man suffered minor injuries when he was struck by lightning. It entered his finger…traveled down his body… And exited his foot.

In 2013…heavy rain caused localized flash flooding in Aurora. An undergound parking garage at an apartment complex was inundated with 3 to 4 feet of water. Flash flooding forced a road closure at East Mississippi Ave. and Alton St. Also… several people had to be rescued when three vehicles stalled in floodwaters at Alameda Ave. and Havana St. The stationary thunderstorms dumped 2.75 inches of rain in less than 45 minutes. In addition…large hail…up to one inch in diameter… was reported north of Roxbourough State Park. At Denver International Airport…just a trace of rainfall was observed.


In 1979…heavy thunderstorm rains on each of three consecutive days dumped a total of 2.22 inches of rain at Stapleton International Airport. The heaviest rain… 0.95 inches…fell on the 9th. Small hail to 1/8 inch diameter fell on the 8th.


In 1875…clouds of grasshoppers were seen flying through the air on the prevailing winds during each day.


In 1900…a thunderstorm produced west winds sustained to 47 mph with gusts to 55 mph…but only 0.01 inch of rain.

In 1902…a thunderstorm produced no rain and north winds sustained to 52 mph with gusts to 60 mph.

In 1934…heavy cloudbursts in the foothills near Kittredge and at the head of Mount Vernon creek caused flash flooding on both Bear Creek and Mount Vernon Creek at Morrison… Which resulted in 6 deaths and much property damage. The highway in Mount Vernon canyon was destroyed by the flood waters.

In 1981…3/4 inch hail fell at Kittredge near Evergreen in Jefferson County.

In 1987…3/4 inch hail fell in Boulder and 9 miles northwest of Castle Rock.

In 1995…lightning struck a 16-year-old counselor in the back of the head while he and a friend were standing under a tree at the singing river ranch…7 miles west of Evergreen. He stopped breathing…but his friend was able to summon help and they were able to revive him. He was hospitalized for a few days and released.

In 1998…brief…weak tornadoes (f0) were sighted near Bennett and Roggen. No damage was reported. Hail as large as 1 inch diameter fell in Franktown with 3/4 inch diameter hail measured near Castle Rock. Thunderstorm winds gusted to 61 mph near Roggen.


In 2006…mid and high cloudiness overnight on both days resulted in two temperature records. The low temperature of 71 degrees on the 9th was a record high minimum for the date. The low temperature of 68 degrees on the 10th equaled the record high minimum for the date first set in 1936.


In 1924…0.01 inch of rain fell over downtown Denver. This along with the 0.01 inch of rainfall on the 4th was the only rainfall of the month…making this the driest August on record in the city.

In 1962…the high temperature reached 100 degrees at Stapleton Airport.

In 1970…hail stones to 1 inch in diameter were reported in the Fort Lupton area.

In 1972…dry thunderstorm microburst winds gusting to 46 mph briefly reduced the surface visibility to 3/4 mile in blowing dust at Stapleton International Airport.

In 1978…lightning struck two men in Aurora…killing one and injuring the other.

In 1982…a tornado was sighted near Castle Rock and remained on the ground for 10 minutes. Wind gusts to 60 mph were reported in Castle Rock. No damage was reported.

In 1994…heavy thunderstorm rains caused flash flooding on Lena Gulch in west metro Denver. Damage was estimated at 50 thousand dollars. Lightning struck a house in Westminster…causing a small attic fire.

In 1996…strong thunderstorm winds toppled a tent at a company picnic in Westminster. Five people received minor injuries when the tent collapsed. Two cars nearby were also damaged by flying debris. A weak tornado (F0)…first sighted near Denver International Airport…traveled east to near Bennett and Strasburg. No significant damage was reported.

In 1998…heavy rain caused flooding and flash flooding problems over southwest metro Denver. An observer in Lakewood measured 3.26 inches of rainfall in an hour. Several streets were flooded in central Lakewood.

In addition…a trailer park along Lena Gulch in Wheat Ridge was evacuated due to high waters. One inch diameter hail fell near Roggen.

In 1999…thunderstorm-producing tornadoes…damaging straight line winds…heavy rain…and hail hammered metro Denver. In the city…small hail and heavy rainfall…up to 2.50 inches an hour…caused a 20-foot by 50-foot section of the roof to collapse at a furniture warehouse. Damage to the warehouse was estimated at 1 million dollars. Heavy rain also flooded several underpasses with up to 3 feet of water…which resulted in a number of stalled vehicles. In Fort Lupton…a tornado bounced across the area. Spotty damage was reported along a 5-mile path as trees…power poles…and lines were downed. In addition…an empty semi-trailer was overturned onto another vehicle northeast of the town. Thunderstorm winds gusted to 81 mph south of Fort Lupton.

In 2004…severe thunderstorms pummeled metro Denver with large hail. Hail up to 3 inches in diameter was measured 10 miles east of Castle Rock. Two inch diameter hail fell in Louisville…10 miles north of Hudson…and 1 mile east of Brighton. Hail to 1.75 inches was reported in Englewood… 1 mile south of Ft. Lupton…and 8 miles east of Boulder. Hail to 1.50 inches was reported around Boulder…near Broomfield…and in Lafayette…Thornton and greenwood village. Hail from 3/4 to 1 inch in diameter was found in Broomfield… Brighton…Castle Rock…Denver and Thornton…and near Longmont… Northglenn…greenwood village…Morrison…and Wheat Ridge. Severe thunderstorm wind gusts were recorded to 66 mph in Parker and to 60 mph 5 miles northeast of Boulder. There were no damage estimates from the hail or wind.

» Click here to read the rest of August 7 to August 13: This week in Denver weather history

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Cooler temps, chances for showers for Thornton’s weekend

Friday, August 5th, 2016 5:27am MST

The three-day period starts out much cooler than what we have seen lately, in fact offering our coolest temperatures in more than two months. We will then warm up each day for the balance of the weekend but remain cooler than normal.

For Friday we have yet to see much in the way of shower activity other than a few sprinkles. Off and on shower activity can be expected throughout the day and into tonight. Skies will be cloudy and temperatures will be topping out in the low 70s, readings we haven’t seen since the end of May.

The low pressure system will gradually shift east Saturday leading to a return of some sun and warmer temperatures. Partly sunny skies will be above with highs in the low 80s. Showers and thunderstorms will be a possibility for the afternoon.

The weekend closes out Sunday with a seasonal kind of day. Temperatures will be reaching the mid to upper 80s with a good dose of sun above. The afternoon brings a typical chance for thunderstorms.

Have a great weekend!

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