Thornton, Colorado, USA
UpdatedSun, 15-Sep-2019 6:50pm MDT 


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Thornton’s workweek starts off with potentially record-setting heat

Monday, August 19th, 2019 5:08am MDT

High pressure has settled in and will be keeping things pretty stable today and allow temperatures to climb. With a good dose of sun, temperatures will push toward record-setting highs.

Sunny skies start us off early this morning and then we will have just a few clouds for the balance of the day but nothing too intrusive.

With little moisture and a stable atmosphere, we do not expect any thunderstorms. Highs today will be well above normal and will come close to the record high for the date of 97 degrees set in 1986.

Tonight, partly cloudy skies will be above with overnight low temperatures in the mid-60s.

What lies ahead for the rest of the week? See here.

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August 18 to August 24: This Week in Denver Weather History

Sunday, August 18th, 2019 4:32pm MDT
This week in Denver weather history

August 18 to August 24: This Week in Denver Weather History

Our look back at this week in Denver weather history highlights the extreme weather that can be visited upon us this time of year. Many of the events showcase severe weather more associated with spring than the latter half of summer.

From the National Weather Service:


In 1979…heavy thunderstorm rains on each of 4 consecutive days dumped a total of 2.62 inches of rain on Stapleton International Airport. The heaviest rain…1.05 inches… On the 19th was accompanied by 1/4 inch diameter hail.


In 1965…heavy rain in areas south and east of Denver caused some flooding in Littleton and Englewood. Clear creek was running near bankfull…and heavy rain in southwest Denver flooded intersections.

In 1966…a brief very heavy thunderstorm dumped 0.61 inch of rain in just 5 minutes at Stapleton International Airport. Total rainfall from the storm…0.64 inch…fell in just 10 minutes. Half inch diameter hail also fell at Stapleton International Airport. The public sighted funnel clouds 10 to 15 miles south of the airport.

In 1967…hail struck in a strip along the eastern foothills and caused minor damage in Boulder. Hail accumulated to a depth of 4 to 6 inches in Jefferson County just southwest of Denver.

In 1983…one inch to hen egg size hail was reported in Broomfield with golf ball size hail at Northglenn.

In 1990…dime size hail and thunderstorm wind gusts to 50 mph were reported by storm spotters just east of Aurora near the intersection of Mississippi Avenue and Gun Club Road. The hail and strong winds damaged a number of windows in the area.

In 1991…very heavy rain from slow moving thunderstorms dumped up to 3 inches of rain in 20 minutes in the vicinity of Idaho Springs and Central City. Flooding in Idaho Springs forced the closure of the Virginia Gulch Road…which runs from Idaho Springs to Central City. Dirt roads above Central City were damaged or destroyed with the mud being swept onto streets in town. High water in Clear Creek…up to 3 feet above flood stage…washed out a bridge in Idaho Springs. Rock and mud slides forced the closure of I-70 about 1 mile east of Idaho Springs.

In 1997…dry microbursts produced two peak wind gusts to an estimated 60 mph east of Buckley Field.

In 2000…hail as large as 3/4 inch in diameter was measured 5 miles west of Sedalia.

In 2003…a severe thunderstorm produced hail as large as 2.75 inches in diameter at Highlands Ranch. Hail to 3/4 inch was reported in Aurora near Cherry Creek and in Arapahoe County 9 miles southeast of Aurora.

In 2004…heavy thunderstorm rainfall caused flash flooding across central and southern metro Denver. A rain gage at City Park recorded 4.37 inches of rainfall from the deluge. Several roads in and around the city had to be closed due to floodwaters…stranding many vehicles. The Denver fire department conducted at least 15 water rescues. One driver nearly drowned when he made a wrong turn into a retaining pond. Four men who witnessed the accident were able to save the man before his car was completely submerged. Widespread street flooding was reported in the Denver Stapleton area where rainfall totaled 3.81 inches. Standing water over 6 inches deep was reported near I-70 and Quebec…I-225 south of I-70…and I-25 near 6th Avenue. Flood waters reached 8 feet deep in some low lying areas as sewers became clogged and the storm runoff pipes were unable to handle the heavy flow of water. Heavy rainfall caused additional flash flooding south of Denver. Several street intersections in Centennial and southern Aurora became impassable due to high water. Two feet of water covered portions of the roadway near Park Meadows Mall. One person had to be rescued near the intersection of Arapahoe Road and Liverpool. Floodwaters forced the closure of Stonegate Parkway near Jordan Road and Lincoln Avenue. Flooding was also reported on Meridian Blvd. near I-25. Rainfall was 1.62 inches at Denver International Airport.


In 1875…nearly 0.75 inch of rainfall in the city overnight… Possibly assisted by heavier rainfall upstream…produced a decided and rapid rise in Cherry Creek…which washed out some bridges. Other small creeks and streams were filled to overflowing.


In 1983…heavy rain fell across the northern metro Denver suburbs with 1.50 to 1.80 inches of rain in Broomfield… Arvada…and Thornton.

In 1989…lightning killed a 31-year-old man and injured his 10 year old nephew when it hit a tree they were walking under in the foothills about 5 miles west of Boulder. The boy received mouth to mouth resuscitation on the scene and recovered after being hospitalized overnight. Three other people were knocked to the ground by the bolt…but were uninjured.

In 1990…3/4 inch diameter hail was reported in Wheat Ridge. A thunderstorm over west Denver dumped an inch of rain in 20 minutes…causing minor street flooding. One inch diameter hail was reported over east Denver. Ping pong to golf ball size hail was reported 14 miles northeast of Denver at the intersection of 122nd Ave. and Brighton Blvd. The hail stones knocked out windows and did an unspecified amount of damage to the roof of a house. Close by…heavy thunderstorm rains caused gullies…irrigation ditches…and small streams to overflow their banks near the intersection of 120th Avenue and Riverdale Road. Flood waters 1 to 2 feet deep covered the river bottom land along the South Platte River. However…no structures were threatened by the flood waters.

In 1999…heavy rain…up to 5 inches in two hours…caused east tollgate creek to jump its banks. The bike path adjacent to the creek was underwater at several locations. Several underpasses were also flooded…halting traffic. In addition…an unfinished playground at a local elementary school was completely flooded. Lightning struck a vehicle at East Evans Avenue and Tower Road. The woman inside the vehicle was not injured.


In 1875…grasshoppers appeared in great numbers at 10:00 am on the 19th. Thousands landed on the ground. The streets were literally covered with them. Swarms of grasshoppers were seen on each day. All gardens in the city were devastated…and in the countryside the grasshoppers were very destructive to ripened grain. On the 30th the grasshoppers were so numerous as to almost darken the sun.


In 1980…winds to 55 to 60 mph were recorded in south Boulder.

In 1982…strong thunderstorm winds blasted the Jefferson County Airport near Broomfield…causing an estimated 3 million dollars in damage. At least 5 hangars and 15 airplanes were damaged…many seriously; one hangar was completely destroyed. Torrential rains accompanied the winds. Heavy rains also dumped on Boulder where 1.65 inches fell in just 15 minutes…causing street flooding. Wind gusts to 72 mph were recorded in Boulder. Over half an inch of rain fell in just 5 minutes in Littleton where two homes were struck by lightning. Lightning also struck a house in Arvada where over an inch of rain sent Ralston Creek over its banks. Strong winds accompanied the storms.

In 1984…slow moving thunderstorms dumped 1.25 inches of rain in Evergreen…causing street flooding. A half inch of rain fell in just 18 minutes in southeast Denver. Littleton and Boulder were also drenched with about an inch of rain. Rainfall totaled 0.92 inch at Stapleton International Airport.

In 2001…severe thunderstorms produced damaging winds and large hail across metro Denver. Hail as large 1 inch in diameter fell in Aurora near Cherry Creek. Strong thunderstorm winds gusting as high as 58 mph blew the roof from a building between Thornton and Denver and toppled several trees in Denver. One tree landed on a mail truck. Other thunderstorm winds were clocked to 60 mph near Parker… 62 mph in Broomfield…and 61 mph at Denver International Airport.

In 2006…a tornado (f0) touched down near Bennett…but caused no reported damage.

In 2013…severe thunderstorms pounded the southern Denver suburbs and other parts of the Front Range. In Jefferson County…water rescues were reported for some people in stranded cars. In the Ken Caryl area…large hail from one inch to 1 3/4 inches in diameter was reported. On West Chatfield Avenue in Jefferson County…hail runoff gathered six inches deep in spots and “hail plows” were sent out to clear some streets. Hail up to one inch in diameter was also reported near Castle Rock.

» Click here to read the rest of August 18 to August 24: This Week in Denver Weather History

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Thornton’s weekend starts out seasonal, will end up hot

Friday, August 16th, 2019 5:38am MDT

Mother Nature’s furnace is getting ready to kick on. While we will enjoy temps not far from normal and a chance for storms today, temps for the balance of the weekend will be increasing.

Friday will bring mostly sunny skies throughout the day. Highs will top out right around the 90 degree mark. We do stand a chance for PM thunderstorms, mainly after 3:00pm. Some storms in eastern Colorado may turn severe but right now it appears the worst should stay to our east. Overnight tonight, skies will be mostly clear with lows in the upper 50s.

Saturday will be a calm day but with increasing temperatures. Highs will be in the mid-90s under mostly sunny skies. Saturday night into Sunday morning, mostly clear skies will be above, lows will again be in the upper 50s.

Sunday brings the heat. Sunny skies will be above with highs in the mid to upper 90s.

Have a great weekend.

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Toasty temperatures for Thornton’s Thursday, some breezy winds

Thursday, August 15th, 2019 5:08am MDT

We will avoid any thunderstorm activity today and enjoy lots of sun. However, we will see some breezy winds and temperatures will climb five degrees or so above normal.

Sunny skies start us off this morning and will be with us until the afternoon when a few clouds will arrive. Winds will pick up speed by mid-afternoon and be a bit breezy. High temperatures will reach the mid-90s.

Tonight, partly cloudy skies will be above with lows around the 60 degree mark.

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Thornton’s Wednesday to offer seasonal temps, slight chance for thunderstorms

Wednesday, August 14th, 2019 5:24am MDT

A pretty good looking summer day ahead for us and for the kiddos heading back to school today. Highs will be right near average for the date and chances for thunderstorms are a bit lower than in recent days.

Sunny to mostly sunny skies will be above this morning. We’ll see a bit of an increase in cloud cover in the afternoon but the sun will still be making appearances.

Some isolated thunderstorms may be seen this afternoon and evening but the best chances for activity will be to our east.

Highs today will top out right close to the average for the date of 88 degrees.

Tonight, some thunderstorms may roll after dark but will end by midnight. Skies will then clear and overnight lows will dip to around 60 degrees.

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August 11 to August 17: This Week in Denver Weather History

Wednesday, August 14th, 2019 3:55am MDT
This week in Denver weather history

August 11 to August 17: This Week in Denver Weather History

Colorado’s unofficial severe weather season may be over but August holds a wide variety of related weather hazards that can be damaging and deadly. Looking back at this week in Denver weather history, flooding, large hail and even tornadoes have made appearances in our past.

From the National Weather Service:


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


In 1872…fog was very dense until about 8:00 am. There was water dripping from the roofs of houses as if it had rained. The rain gage showed 0.01 inch of moisture…even though there had been no rainfall.

In 1927…an apparent dry microburst produced only a trace of rain and brief northwest winds sustained to 34 mph with gusts to 44 mph.

In 1980…hail up to golf ball size caused some roof and car damage in the southern part of Aurora.

In 1990…lightning ignited a storage tank filled with 10 thousand gallons of crude oil in a farmer’s field near Dacono…25 miles north of Denver. Flames shot to 40 feet high for nearly 2 hours before being extinguished. A lightning bolt also struck 21 miles north of Denver at an Erie fire station…causing extensive damage to the gas meter and electrical system. The sudden power surge blew out the station’s television set…a refrigerator…and a pop machine. Small fires spread throughout the structure… Totally destroying the building’s electrical wiring. The fires were quickly extinguished by the in-resident fire fighters. Golf ball size hail was reported in Denver near the intersection of Santa Fe Drive and I-25.

In 2012…a severe thunderstorm produced a wind gust to 60 mph at rocky mountain metropolitan airport.

In 1992…dime size hail fell in Westminster.

In 1994…strong thunderstorms produced large hail across northwest and north metro Denver. One inch diameter hail fell in Brighton with 3/4 inch hail reported in Westminster and at Indian Hills in the foothills west of Denver. Lightning struck a house in Arvada. The resulting fire destroyed one-third of the house. Funnel clouds were sighted over Westminster.

In 1997…large hail…strong winds…and torrential rains hammered portions of Lakewood and south Denver. Nearly 1 inch of rain fell in the span of 10 minutes in south Denver with a storm total of 1.81 inches. Street flooding was extensive as gutters and other drainage systems in the area were clogged by hail…piled several inches deep…and other debris. Strong thunderstorm winds to 50 mph and large hail accompanied by heavy rain caused extensive damage to cars…homes…and businesses. Several trees were downed by the strong winds…and trees were stripped of their leaves by hail. A water lily exhibition on display at the Denver botanic gardens was heavily damaged. Final estimates of the damage included 60 million dollars to automobiles and an additional 68 million dollars to homes and businesses. Hail to 1 1/2 inches in diameter fell in south Denver with 3/4 to 1 inch hail in Lakewood. A man received minor injuries in Aurora when he was struck by lightning while talking on the telephone.

In 2003…hail to 3/4 inch in diameter was measured in Aurora near Cherry Creek.


In 1876…the temperature climbed to a high of 100 degrees in downtown Denver.

In 1941…excessive thunderstorm rainfall flooded streets and delayed traffic for a few hours in some sections of the city. The basements of a considerable number of homes and commercial buildings were flooded. The total value of the damage was unknown. Only 0.94 inch of thunderstorm rainfall was recorded downtown.

In 1969…a man and a 9-year old boy were injured…when lightning struck a tree near where they were standing. Both were revived after treatment…but the boy later died of respiratory failure due to electrical shock.

In 1984…heavy thunderstorm rains drenched southern metro Denver. Rural roads in Douglas County received minor washouts. Hail…as large as 3/4 inch in diameter…was reported in southeast Aurora with one inch diameter hail reported near Parker. Rainfall totaled 1.00 inch at Stapleton International Airport.
12-13 in 1975…heavy rains caused flash flooding along the foothills from Denver north. Thunderstorm rainfall totaled 1.56 inches at Stapleton International Airport.

In 2004…a brief cool spell resulted in two daily temperature records. The low temperature of 49 degrees was a record minimum for the 12th…as was the low temperature of 48 degrees on the 13th.


In 1959…thunderstorm winds gusted to 53 mph at Stapleton Airport.

In 1983…thunderstorms dumped torrential rain in Northglenn… Thornton…and Broomfield. Northglenn was drenched with 1.72 inches in 30 minutes. Street flooding was widespread. Hail…as large as 3/4 inch in diameter…was reported 7 miles northeast of Boulder along with heavy rain which caused some street flooding.

In 2000…lightning sparked 3 small grass fires near Golden. The fires were quickly contained. Hail as large as 3/4 inch in diameter fell in Castle Rock.


In 1960…a bolt of lightning struck a man in Henderson… Causing serious burns.

In 1962…the temperature climbed to a high of 100 degrees at Stapleton Airport.

In 1968…a young man on a golf course in Denver was injured when lightning struck a tree under which he was standing. Lightning caused minor damage to a house in Denver. Heavy thunderstorm rain caused local street flooding. One inch diameter hail fell at Jefferson County Airport near Broomfield.

In 1973…winds as high as 85 mph damaged 20 aircraft at the Arapahoe County airport…now Centennial Airport.

In 1977…three tornadoes were sighted in Bennett. A man suffered a broken leg when hit by a flying board. He was outside his camper home…which was destroyed. All windows were broken in a near-by farmhouse where some shingles were ripped off and a 2 car garage was knocked down. Several vehicles were damaged and a cat…some rabbits…and chickens were killed. A broken oar from a boat was driven into the side of a house. A mobile home was overturned. One old barn was destroyed. Half a dozen homes and several agricultural buildings were damaged just west of State Highway 79.

In 1978…high winds produced much blowing dust…causing many traffic accidents in the Denver-Boulder area. Winds gusts of 70 to 101 mph were recorded. Northwest winds gusted to 44 mph at Stapleton International Airport.

In 1980…lightning hit two power poles in Littleton…causing 400 dollars in damage. Rainfall of 1.23 inches in a short time caused minor flooding…which included damage to a ground floor apartment and partially submerging a few vehicles in water. Thunderstorm rainfall totaled 0.98 inch at Stapleton International Airport.

In 1983…2.10 inches of rain drenched Golden in an hour with similar amounts in Lakewood and Boulder. Over ten thousand dollars’ worth of plants were washed away at a nursery in Lakewood.

In 1997…twelve motorists were injured in a multi-car accident when strong microburst winds estimated to 50 mph blew blinding dust across I-70 near Bennett.

In 1998…lightning struck a hydro-electric plant in Nederland… Causing a power outage. Residents in the foothills west of Boulder…including Nederland…Ward…Eldora…Jamestown… and Gold Hill…were without power for about an hour.

In 2006…heavy thunderstorm rainfall near Deckers washed away some the banks along State Highway 67 between Deckers and Westcreek. Several driveways on both sides of the highway were also damaged.

» Click here to read the rest of August 11 to August 17: This Week in Denver Weather History

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Tuesday in Thornton to bring temps a bit warmer than normal, chance for evening storms

Tuesday, August 13th, 2019 4:52am MDT

Today’s weather will look much like yesterday but we throw in the possibility of a thunderstorm in the evening.

Sunny skies start us off and will be with us this morning. A few clouds arrive in the afternoon and will build a bit into the evening. Highs will top out around 90 degrees, a bit above normal for the date.

From about 6:00pm to midnight we may see some gusty thunderstorms, most likely seeing them around sunset.

Skies will gradually clear overnight with lows near 60 degrees.

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Temps a bit above normal, calm, dry conditions for Thornton’s Monday

Monday, August 12th, 2019 4:54am MDT

We start off the workweek with a good looking day of weather. Temperatures will be near normal and we will have lots of sun and no storms.

Sunny skies will be with us throughout the daytime hours. Winds will be calm this morning then become a bit breezy out of the east in the afternoon. Highs today will top out around the 90 degree mark, a couple degrees above normal for the date.

Tonight, mostly clear skies will be above with lows dipping to about 60 degrees. Enjoy!

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Thornton’s weekend to feature seasonal temperatures, chances for storms each day

Friday, August 9th, 2019 5:34am MDT

Pretty typical weather for us over the three day period. Temperatures will be at or close to normal and PM thunderstorms will be seen.

For today, mostly sunny skies will be above this morning then an increase in clouds in the afternoon. Some scattered thunderstorm activity will be seen with gusty winds, some brief rain being possible. Highs today will be in the low 90s. Tonight, storms will end not long after sunset and we will have mostly cloudy skies with lows in the mid-60s.

Saturday will see partly cloudy skies above throughout the day. Highs will be in the upper 80s. Thunderstorms are possible from about noon until sunset or so. Saturday night into Sunday morning, lows will be in the low 60s.

Sunday offers more of the same. Partly cloudy skies will be above and highs will again top out in the upper 80s. We will have our best chance of storms for the weekend that afternoon.

Have a great weekend

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Thornton’s Thursday to offer cooler temperatures, better chance for storms

Thursday, August 8th, 2019 5:37am MDT

A bit of a break from the hot, dry pattern of recent days. Moisture is increasing and will be coupled with cooler air leading to lower temps and better chances for storms.

The day starts with partly clear skies and we will see much of the same for most of the day. High temperatures today should top out in the very comfortable low 80s range.

Thunderstorms will begin to develop around noon, if not a bit before, with our best chances for activity coming after 4:00pm until 8:00pm. Some of the storms will have the potential to deliver a heavy dose of rain and will bear close watch.

Tonight, any storms should end after midnight. Lows tonight will be near the 60 degree mark.

Keep an eye out for the storms here.

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