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Thornton, Colorado, USA
UpdatedTue, 17-Oct-2017 9:05am MDT 
 

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Thornton’s Thursday to bring seasonal conditions, chance for storms

Thursday, May 25th, 2017 5:12am MDT

With low pressure pushing through, the weather turns a bit unsettled today but much like what we expect this time of year. Temperatures will be a bit above normal and the afternoon brings chances for thunderstorms.

We start out with mostly sunny skies and will see much of the same for the morning hours with some varying degrees of cloudiness. The afternoon will see coverage increase. Temperatures start out mild this morning and then will work their way toward a high around 77 degrees. Average for the date is 75 degrees.

This afternoon will bring some thunderstorm and shower activity to the area with the most notable feature being some gusty winds. Best chances for activity for us will be between about 3:00pm and 8:00pm.

Tonight a few lingering showers may occur and temperatures will dip to lows in the mid to upper 40s.

You can keep an eye out for those storms with our radar here.

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Wednesday brings warmest temps of the week, lots of sun

Wednesday, May 24th, 2017 5:14am MDT

High pressure has built over the region today and that will help usher in a very mild day. The calm, dry conditions though will not last long and unsettled conditions will return soon.

We start out today with sunny skies above and for the majority of the day, that will be rule. The afternoon may see a few clouds but nothing that will be intrusive. Temperatures will be climbing to a high in the low 70s, a good bit above the average for the date of 74 degrees.

Winds will be calm this morning and into the early afternoon but by mid to late afternoon they will become a bit breezy with gusts to 25mph or so being possible. Look for them to start to ease in the evening.

Looking ahead, a series of systems will bring back the unsettled, cooler pattern that has dominated us for the past week or so. With the exception of tomorrow, temperatures through the weekend look to be a bit below normal and each day will feature varying chances for showers and thunderstorms. Get more details in our extended forecast here.

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Thornton’s Tuesday offers cool temperatures, breezy winds

Tuesday, May 23rd, 2017 5:20am MDT

In wake of yesterday’s disturbance that brought us some nice rain showers, we dry out today. However, cool temperatures will linger and much of the day will see some breezy winds.

Mostly sunny skies start things out today and we will see similar coverage throughout the day, perhaps a few more clouds later. Cool air remains entrenched along the Front Range and that means highs today will only be in the low to mid-60s.

Probably the most notable weather feature of the day will be the breezy winds. They will be picking up by mid to later morning then by noon and lasting through late afternoon gusts to 25mph or so will be seen.

Tonight, skies will clear and the mercury will dip to around 40 degrees.

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As one system moves out, another arrives keeping conditions unsettled Monday

Monday, May 22nd, 2017 5:14am MDT

The system that moved through last night brought us a respectable bit of rain. As that one moves out, another front will arrive later today bringing more of the same and keeping temperatures cool.

We start out the day with mostly sunny skies then will see gradually increasing cloud coverage starting by mid-morning. Temperatures will be similar to yesterday with highs topping out in the mid to upper 60s.

The next front arrives by mid to late afternoon and with it will come some gusty winds, showers and perhaps some thunder. Best chances for precipitation will come from about 5:00pm to 10:00pm then activity will taper off into the early morning hours.

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May 21 to May 27: This week in Denver weather history

Sunday, May 21st, 2017 3:27am MDT
This Week In Denver Weather History

May 21 to May 27: This week in Denver weather history

If history is a teacher, our look back at this week in Denver weather history should provide great instruction on the dangers severe weather presents in our history. It was eight years ago this week that the infamous Windsor tornado tore through the area killing one man and damaging hundreds of homes.

From the National Weather Service:

20-21

In 1891…heavy rain was mixed with snow at times and totaled 2.02 inches in the city. Snowfall was 1.0 inch. Northeast winds gusted to 28 mph on the 20th.

20-22

In 1959…a three-day rain caused some flooding in metro Denver where rain totaled 1.68 inches at Stapleton Airport. Showers…accompanied by hail near Brighton…caused some damage to truck crops. Heavy snow in the foothills caused damage to power and telephone lines.

20-27

In 2002…lightning sparked a wildfire near Deckers. Extremely dry conditions and very strong winds the following day allowed the fire…known as the Schoonover…to consume 3850 acres before it could be contained. Thirteen structures were destroyed…including 4 homes…resulting in 2.2 million dollars in damage.

21

In 1874…an extensive fire at Central City in the mountains to the west of Denver produced large columns of smoke that were visible from the city. In the afternoon…the smoke and fire produced a dark inky black convective cloud…which spread over the city and produced brief strong and gusty winds along with a few sprinkles of rain.

In 1880…west winds increased to a sustained velocity of 40 mph during the afternoon.

In 1893…north winds were sustained to 48 mph.

In 1914…a severe thunderstorm was attended by hail…excessive rainfall which totaled 1.94 inches…and an unusual amount of vivid lightning. The heavy rainfall of 0.83 inch in 15 minutes produced flooding…which caused considerable damage to bottom lands in eastern and southern parts of the city. Many garden tracts and cellars were flooded. Southwest winds were sustained to 29 mph with gusts to 34 mph.

In 1935…no precipitation occurred…making this one of only two days without precipitation during the entire month. The other day was the 10th. Precipitation totaled 4.95 inches for the month.

In 1952…a tornado produced a high column of dust and dirt over northwest Denver. No damage was reported.

In 1988…a microburst wind gust to 52 mph was recorded at Stapleton International Airport.

In 2002…very strong winds occurred over metro Denver and northeastern Colorado as a developing surface low pressure center intensified. Trees and branches snapped…downing power lines across parts of metro Denver. About 20 thousand residents lost electricity. The strong winds produced much blowing dust and dirt especially to the northeast of metro Denver. Winds gusted to 61 mph at Parker. South winds gusted to 58 mph at Denver International Airport.

In 2006…a large dust devil formed near Quincy Reservoir in south Aurora. The tall column resembling a tornado or smoke plume extended upward into small high-based cumulus clouds and was visible for miles across southern Aurora and eastern centennial. No damage was reported.

In 2014…severe thunderstorms occurred in and around metro Denver. The storms produced large hail…from quarter to golfball size. Frontier Airlines canceled 16 flights…when several planes sustained hail damage. Forty flights at Denver International Airport were either delayed or canceled. Some homes in Green Valley Ranch…east of Denver… were damaged by hail. Several vehicles were also damaged. Five short lived tornadoes touched down near Bennett and Byers but no damage was reported. The storms also produced heavy rain and strong damaging winds. The wind downed trees and power lines east of Denver. The heavy rain and hail…up to 6 inches deep in spots…caused street flooding around the metro area. The hailstorm at Dicks Sporting Goods Park knocked out power to the stadium where the 4A and 5A girls soccer championship games were about to be played. The inclement weather snarled traffic on Interstate 70…Pena Boulevard… U.S. 85 and elsewhere due to the flooded roads. In some areas…snow plows were called out to clear the hail. Parts of Tower Road and Peoria Street…and other roads in Commerce City… were closed through the late evening hours…because of standing water. Several vehicles stalled in standing water where water pooled in the underpasses. At Denver International Airport…1.2 inches of water was observed…along with a wind gust to 42 mph from the northwest.

21-22

In 1878…overnight heavy rains of cloudburst intensity on the Palmer Divide to the south of the city caused flash flooding on Cherry Creek in Denver…which resulted in 2 deaths. A wall of water swept through the city between 2:00 am and 3:00 am on the morning of the 22nd. The flood was so sudden and unexpected that homes along the creek in the city were submerged in water knee deep before the slumbering occupants knew anything about it. By daybreak the banks on both sides of the creek were lined by residents viewing the destruction caused by the raging waters in such a short time. Seven bridges across the creek were destroyed in the city. Damage to private and city property was estimated between 30 and 50 thousand dollars. Quite a number of cattle and sheep were killed along the reach of the creek. Only 0.01 inch of rain fell in the city on the 21st with a trace of rain on the 22nd. Flash flooding also occurred on Kiowa Creek near Bennett on the night of the 21st when the flood waters washed out the Kansas Pacific Railroad bridge. An east bound freight train plunged into the turbulent waters killing the three crewmen. The locomotive was completely buried in the sand and never found to this day!

21-23

In 1876…snow changed to heavy rain over the city…resulting in widespread flooding along Cherry Creek and the South Platte River…nearly as great as the flash flood of May 19-20…1864. However…damage was greater because the city had grown much larger and there were more bridges for the flood waters to destroy. Precipitation in the city totaled 6.70 inches from 10:00 pm on the 21st through 3:00 am on the 23rd. The greatest precipitation ever recorded in Denver in 24 hours…6.53 inches…occurred on the 21st and 22nd. Small buildings and bridges along Cherry Creek were washed away by the flood waters. Bridges over the South Platte River were damaged. The city irrigation ditch was damaged and rendered unfit for service. Strong winds at speeds of 30 to 40 mph drove the heavy rain through brick walls 12 to 16 inches thick. Many sheep and cattle were either killed by lightning or drowned…including some 100 head of cattle in Jefferson County alone. There was immense damage to railroad tracks…especially the Kansas Pacific line to the east of the city. The Colorado central suffered estimated damage of 10 to 15 thousand dollars. In addition…the heavy rain caused extensive flooding on Soda and Bear Creeks in the foothills. Flooding along Boulder Creek inundated farm and pasture land in the Boulder Valley and damaged a few bridges. Rail travel had to be suspended in the area for several days.

22

In 1876…the most precipitation in Denver on any calendar day…6.50 inches…occurred.

In 1901…northeast winds were sustained to 41 mph with gusts to 45 mph.

In 1903…west winds were sustained to 45 mph with gusts to 55 mph from an apparent microburst…which produced a trace of rain.

In 1976…the public reported 3/4 inch diameter hail and wind gusts to 53 mph near Littleton.

In 1987…golf ball size hail fell in the Lorretto Heights area of south metro Denver.

In 1991…a tornado touched down briefly in Castle Rock. No injuries were reported.

In 1993…an off duty national weather service employee reported hail up to golf ball size just west of the city of Denver in Jefferson County. Thunderstorm wind gusts reached 58 mph at Jefferson County Airport near Broomfield and 33 mph at Stapleton International Airport.

In 1996…a severe thunderstorm pummeled northwest and northern sections of metro Denver with large hail ranging in size from 3/4 to 2 inches in diameter. The cities of Arvada and Westminster were the hardest hit. The insurance industry estimated 60 million dollars in damage to homes and personal property and 62 million dollars in damage to automobiles…for a total of 122 million dollars in insured losses. This estimate also included the cities of Golden… Thornton…and wheat ridge. This was the fourth worst hailstorm to hit metro Denver in the last 10 years.

In 1998…large hail fell across north metro Denver. Hail as large as 1 1/2 inches in diameter was measured in Broomfield and Hudson. Hail to 1 1/4 inches fell in Roggen. Hail to 1 inch fell in Brighton…near Keenesburg… In Watkins…and in the city of Denver. Lightning ignited a house fire in Ft. Lupton. A warehouse worker in Denver was injured when he was knocked off a loading dock by a lightning bolt. The bolt skipped off a nearby radio tower and struck him in the arm. He was treated for numbness in his right arm and released.

In 1999…severe thunderstorms produced 7/8 inch diameter hail over the city of Denver…with one inch diameter hail reported in Aurora…and 3/4 inch hail near Watkins.

In 2006…a lightning strike sparked a fire and damaged the roof of a recreation center in Evergreen. The fire spread into some brush and consumed about one quarter acre before it was extinguished. Severe thunderstorms produced strong wind gusts across portions of metro Denver. Winds gusted to 72 mph in Georgetown…62 mph near Parker and Bennett… 60 mph in Castle Rock…and 59 mph in Longmont. The winds caused no reportable damage. A thunderstorm produced southwest wind gusts to 52 mph at Denver International Airport.

In 2008…a powerful tornado swept north-northwestward across Weld County…carving a path of destruction nearly 39 miles in length. The tornado…up to one-mile wide at times… Initially touched down northeast of Platteville and finally lifted 6 miles west-northwest of wellington. A tornado assessment in the aftermath of the tornado revealed extensive areas of damage. On the Enhanced Fujita Scale… There were pockets of ef3 damage near the Missile Silo Park campground and to businesses and a home in eastern Windsor. Farmers reported extensive damage to crops and irrigation equipment. There was one fatality and 78 injuries… Ranging from broken bones to minor cuts and lacerations. One man was killed when he tried to escape a trailer park in his motor home. Tractor trailers were flipped along U.S. Highway 85…and over 200 power poles were snapped or blown down. Approximately 60000 people were left without electricity. The tornado overturned 15 railroad cars and destroyed a lumber car. The tornado also flattened the main feedlot in Windsor and destroyed a dairy barn. Most of the 400 cows were killed in the tornado or destroyed later. The thunderstorm also produced hail up to the size of baseballs. Another tornado from a separate thunderstorm… Rated an ef1…briefly touched down near Dacono and destroyed 5 buildings. The tornado overturned a five-wheel trailer and injured a man sitting inside. Preliminary estimates from FEMA indicated 850 homes were damaged…and nearly 300 homes were significantly damaged or destroyed. The Poudre Valley Rural Electric Associated reported $1 million of damage to electric transmission lines. Privately insured damages totaled $147 million…making it the state’s 4th costliest disaster. Large hail up to 1 1/2 inches in diameter…was reported in the vicinities of Golden and Longmont.

In 2014…a severe thunderstorm Denver area produced nickel to quarter size hail in parts of west Denver and near Bennett. Locally heavy rainfall produced some minor street flooding in parts of metro Denver. The heavy rainfall produced localized flash flooding near Bennett. Rainfall totaled 0.54 inches at Denver International Airport.

22-23

In 1933…high winds and gales overnight caused considerable damage in and near the city. Much greenhouse glass was broken…which caused damage to sheltered plants. Great numbers of plants growing in the open were damaged or killed by wind-driven sand and soil. Fields were eroded by the wind and a few trees were uprooted. West winds were sustained to 38 mph with gusts as high as 65 mph in downtown Denver on the 22nd.

» Click here to read the rest of May 21 to May 27: This week in Denver weather history

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Storm system winds down, gradual warming & drying for the weekend

Friday, May 19th, 2017 5:15am MDT

Our late season snowstorm is slowly winding down and moving out. Friday will remain chilly and see some showers but the balance of the weekend will see things slowly get warmer and drier.

For today, the system and its effects will be slow to ease. Some light snow / rain showers will be possible through today and this evening but we aren’t expecting any appreciable accumulations. Temperatures will stay chilly today with highs only in the low 40s under cloudy skies.

Overnight tonight the precipitation should end by late evening and skies will begin to clear some. Lows will be dropping to right near freezing and that has prompted a Freeze Warning to be in effect from 2:00am to 9:00am Saturday.

Tomorrow will see dry conditions although we won’t be warming up particularly fast. Look for highs near 60 degrees under partly sunny skies.

Overnight Saturday into Sunday it will be dry with lows to around 40 degrees.

Another system will arrive Sunday and while it will be warmer, it will be a bit unsettled. Partly sunny skies will be above with high temperatures in the low to mid-60s. The afternoon and evening introduce more clouds and a chance for some showers and thunderstorms.

Have a great weekend!

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Weather forces cancellation of most Thorntonest events

Thursday, May 18th, 2017 2:22pm MDT

City of Thornton's ThorntonfestThe soaking, wet weather that began yesterday evening and is expected to run well into tomorrow has caused numerous event cancellations. Now it has claimed another victim – the City of Thornton’s annual Thorntonfest.

Having already received nearly 2 inches of rain in the past twelve hours the Margaret Carpenter Recreation Center fields are absolutely drenched.  Much more precipitation is on the way with no time for the fields to dry before Thorntonfest’s events were to start Saturday morning.

Mayor Heidi Williams announced on Facebook:

Unfortunately the weather has not cooperated with us and for the second time in 22 years, we are forced to cancel MOST of Thorntonfest due to saturated fields. There are 3 (possibly 4) components of the event that we are planning to move forward with:

  • The Cottonwood Classic 5K will go ahead as scheduled at 8 a.m. on Saturday, May 20, at the Thorncreek Crossing Shopping Center.
  • The Rocky Mountain Dock Dogs competition will go ahead as scheduled on Saturday/Sunday, May 20 & 21. It will be moved into the parking lot south of the Carpenter Park multipurpose fields.
  • The Battle of the Bands Competition will go ahead as scheduled in the Carpenter Park Amphitheater, with the bands performing from 10:20 a.m. to 5 p.m.
  • The Canine Frisbee Competition hopes to go forward, as it is a regional competition and people are coming from out-of-state to participate. We are hoping to move them to Woodglen Park because it drains well. However, because the weather is supposed to continue through tomorrow, this decision won’t be made until Saturday morning.

The website will be updated with all of these changes, so the public will be advised to check the website if interested in any of these venues.

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Potent storm set to soak Thornton Thursday and Friday

Thursday, May 18th, 2017 5:28am MDT

And here you thought we were done with wintry weather? Not quite says Mother Nature. A strong system is set to deliver copious amounts of precipitation to the Front Range, some of which may fall as snow.

For the daytime hours today, look for pretty consistent conditions throughout. Skies will be cloudy and rain pretty consistent with the possibility of more than an inch of it falling in the daytime hours – this on top of the more than 3/4″ we have already received over the past 12 hours. Temperatures today will stay right in the mid to upper 30s.

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As temperatures cool tonight, that will begin to introduce the potential for some snow to mix in with the rain. Much of the snow that falls will melt as quickly as it hits the ground however we may see 1 to 3 inches of snowfall tonight through tomorrow with varying amounts actually sticking to the ground. There remains a good bit of uncertainty as to when (if) the snow level will drop enough to bring us the white stuff.

The National Weather Service has issued a Winter Storm Watch that is in effect from 6:00pm this evening to 6:00pm Friday evening. With trees now having leafed out, any snow that does fall will have the potential to damage them and may lead to power outages.

With overnight lows tonight and tomorrow night expected to drop to right near freezing, sensitive plants should be covered or brought inside. Additionally, with this much precipitation, we can expect creeks, streams and rivers to swell.

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May 14 to May 20: This week in Denver weather history

Wednesday, May 17th, 2017 6:22pm MDT
This Week In Denver Weather History

May 14 to May 20: This week in Denver weather history

As we get further into spring the chances for severe weather increase greatly across northeastern Colorado and that is seen in our look back at this week in Denver weather history. We also note the dangers this weather presents as we see events where the weather injured and even killed Coloradoans.

From the National Weather Service:

13-14

In 1912…heavy snowfall totaled 12.4 inches over the city. Most of the snow…9.9 inches…fell on the 13th…which was the greatest 24 hour snowfall in May at the time. This was the last snowfall of the season. The low temperature dipped to 27 degrees on the morning of the 14th.

In 1989…a spring storm brought heavy rain and snow to the foothills. Metro Denver was soaked with 1 to 2 inches of rain. Rainfall totaled 1.26 inches at Stapleton International Airport. In the foothills…Echo Lake received 20 inches of snow. A 30-ton Boulder slid onto I-70 east of the Eisenhower Tunnel…closing the freeway for 2 hours.

14

In 1910…a thunderstorm produced strong winds during the afternoon. Northwest winds were sustained to 42 mph.

In 1913…light moist snow and light hail fell during short intervals…although no thunder was heard. The trace of snowfall was the only snow of the month. Precipitation… Mostly rain…totaled 0.44 inch.

In 1984…a pilot reported a tornado 16 miles east of Stapleton International Airport. No damage was reported. A thunderstorm produced a 58 mph wind gust in Brighton. Thunderstorm winds gusted to 48 mph at Stapleton International Airport.

In 1989…lightning struck a home in Evergreen…setting it afire.

In 1992…strong thunderstorm winds of unknown velocity… Knocked over and damaged the infield tote board at Arapahoe Park Racetrack just southeast of Aurora. Damage was estimated at 200 thousand dollars. No injuries were reported. Lightning started two house fires…causing 35 hundred dollars in damage in Adams County just 9 miles north-northwest of Denver.

In 1994…a sudden wind gust…estimated at 40 mph…blew a portion of the roof off a shopping center in Lafayette. The roof also damaged two parked cars in an adjacent lot.

In 2001…a construction worker in Castle Rock received minor injuries when lightning struck close-by.

In 2002…a microburst wind gust to 53 mph was recorded at Denver International Airport.

In 2007…severe thunderstorms producing large hail…very heavy rain…and tornadoes impacted the urban corridor and adjacent plains. Heavy rain associated with a severe thunderstorm caused flooding along a small tributary draining into the South Platte River. The incident took place at 13th and Decatur St….near Invesco Field. The floodwaters inundated the bike trail adjacent to the creek. A woman with her child sought refuge under a bridge and became trapped by the high water. The woman slipped and the stroller containing the child was swept into the swift current. The child drowned. Rainfall totaled 0.42 inches at Denver International Airport. Elsewhere…golf ball hail was reported near Hudson. Hail…up to one inch in diameter…was observed in Boulder and Lyons. Thunderstorm wind gusts estimated to 70 mph were reported near Buckley Air Force Base…with a peak wind gust to 37 mph observed at Denver International Airport. A small tornado touched down near Ft. Lupton but did no damage.

14-15

In 1977…high winds up to 100 mph felled hundreds of trees in Gilpin County and caused extensive damage to telephone and power lines. Lumber and steel tanks were blown around in Boulder canyon. West winds gusted to 46 mph at Stapleton International Airport on the 15th.

14-18

In 1996…a period of unusually warm weather resulted in 4 record maximum temperatures in 5 days. The record high temperatures were 87 degrees on the 14th…89 degrees on the 15th…and 93 degrees on both the 16th and 18th. The temperature climbed to only 81 degrees on the 17th which was not a record.

15

In 1894…southwest winds were sustained to 38 mph with gusts to 50 mph.

In 1910…an apparent cold front produced sustained northeast winds to 48 mph.

In 1986…a thunderstorm dumped an inch of rain in an hour over the eastern part of Aurora. Total rainfall from the storm was 1.62 inches.

In 1989…a 47 year old man…a Lakewood police officer…was struck and injured by lightning. Small hail piled up 3 to 4 inches deep near Golden. There was reported street flooding from heavy thunderstorm rains over western metro Denver. Rainfall totaled 0.76 inch at Stapleton International Airport.

In 1990…a thunderstorm produced a wind gust to 69 mph at Jefferson County Airport in Broomfield. Thunderstorm winds gusting to 49 mph at Stapleton International Airport produced some blowing dust.

In 1991…a funnel cloud was sighted near Morrison. Later… Hail up to 2 inches deep covered U.S. Highway 285 at South Turkey Creek Road in west metro Denver. Baseball size hail was reported on the east side of Littleton. Dime size hail was reported in Boulder.

In 1993…lightning started a fire which damaged a home in Boulder. No one was injured.

In 1997…a wind gust to 58 mph was recorded at the site of the former Stapleton International Airport. A street sign was blown down at the Havana Street exit along I-70.

In 1999…lightning ignited a small fire in a 3-story structure in sunshine canyon above Boulder. The fire was quickly extinguished and caused only minor damage.

In 2003…thunderstorms produced very heavy rainfall and localized flash flooding in the foothills of central Boulder County. Rainfall ranged from 1.5 to 2.5 inches in less than 2 hours. Water ranging in depth from 6 to 9 inches covered State Highway 119 in Boulder Canyon. Dirt and rocks also washed over the roadway. Some basements were flooded in the sugarloaf area. Rockslides were also reported at Boulder falls…Lefthand Canyon…and Fourmile Canyon.

15-16

In 1957…heavy snowfall totaled 8.8 inches at Stapleton Airport. The greatest amount on the ground was 3 inches.

In 1986…a spring storm dumped 1 to 2 inches of rain over metro Denver…but 2.71 inches fell at Buckley Field in Aurora. Rainfall only totaled 0.84 inch at Stapleton International Airport. Snow fell in the foothills with 7 inches recorded in Coal Creek Canyon southwest of Boulder.

16

In 1875…a heavy hail storm turned into heavy rain during the afternoon. Rainfall totaled 0.86 inch in just 37 minutes…while the temperature dropped 22 degrees in 22 minutes. Precipitation totaled 0.90 inch.

In 1894…west winds were sustained to 48 mph with gusts to 56 mph.

In 1949…a tornado was observed for 16 minutes…20 miles to the southeast of Stapleton Airport. The tornado moved 5 miles to the northeast before dissipating. No damage was reported.

In 1963…intense lightning started several forest fires in the foothills southwest of Denver near Deckers and Cheeseman Lake. Little precipitation fell from the storms to alleviate the unusual dry conditions so early in the season.

In 1978…thunderstorm winds caused damage in southeast Aurora. Winds of 60 to 80 mph blew down numerous fences and damaged several homes under construction. High winds tore docks loose at Cheery Creek Reservoir…sinking 3 or 4 boats and damaging about 15 others. At Stapleton International Airport where winds gusted to 60 mph…a 727 jet suffered 15 hundred dollars damage when wind toppled a runway light onto it. The public reported an unconfirmed tornado 7 miles south-southwest of Stapleton International Airport.

In 1990…a line of thunderstorms moving across metro Denver uprooted a large ash tree…which fell and blocked the outside doors to a Denver elementary school…briefly trapping the students inside. Thunderstorm wind gusts to 69 mph were reported at Jefferson County Airport. Northwest winds gusted to 44 mph at Stapleton International Airport.

In 1991…two tornadoes touched down briefly in Castle Rock… But no injuries or damage were recorded. Heavy thunderstorm rains of 0.50 to 1.10 inches in a couple of hours caused Lena Gulch near Golden to flood. No damage was reported.

In 1996…dry microburst winds of unknown strength overturned a trailer and damaged storage sheds in Strasburg east of Denver.

16-17

In 1981…a heavy rain storm dumped 1 to 2 1/2 inches of rain across metro Denver. Rainfall totaled 1.27 inches at Stapleton International Airport where north winds gusted to 38 mph on 17th.

In 1983…a very strong late spring storm dumped heavy snow over the Front Range. Strong winds with the storm produced blizzard conditions at times. Sustained winds were 20 to 40 mph with a peak gust to 55 mph at Stapleton International Airport. The foothills received 1 to 2 feet of snow with 4 to 12 inches along the foothills. Howling winds whipped the snow into drifts several feet deep…closing schools and highways. Stapleton International Airport was forced to reduce flight operations…closing 2 of 4 runways and stranding hundreds of travelers. Most of the damage and inconvenience caused by the storm was in power outages… Which occurred when wind and heavy wet snow caused hundreds of power poles to snap and topple. About 20 square miles of Denver were blacked out. Precipitation from the storm totaled 1 to 3 inches. At Stapleton International Airport… Snowfall totaled 7.1 inches with a maximum snow depth on the ground of only 2 inches due to melting. The high temperature of 40 degrees on the 17th was a record low maximum for the date. Due to the heavy moisture content of the storm…widespread street flooding occurred on the 18th when much of the snow melted under the warm May sun and temperatures climbed to a high of 57 degrees.

In 1995…significant moisture and upslope flow caused flooding across metro Denver. Moderate to heavy rains… Which began on the evening of the 16th…developed in the foothills and spread eastward over metro Denver throughout the night. The heavy rains brought many creeks and small streams to bankfull or slightly over. Locations along the foothills received between 3 and 4 inches of rainfall from the storm. Boulder received 3.60 inches of rainfall for the 24-hour period…causing minor street flooding near small streams. To the northwest of Boulder…a bridge which crossed Fourmile Creek was washed out. Numerous rock and mudslides occurred in foothills canyons…closing portions of U.S. Highways 6 and 40 and State Highway 119 for a few hours at a time. Rocks were piled 6 feet deep on a stretch of State Highway 119 along with Boulders as large as cars on U.S. Highway 6. A parking lot near a creek in Golden caved in leaving a hole the size of an 18-wheeler. Rushing water washed out a 50-foot stretch of a road in Westminster. Rainfall totaled 1.75 inches at Denver International Airport…but only 1.42 inches at the site of the former Stapleton International Airport.

17 » Click here to read the rest of May 14 to May 20: This week in Denver weather history

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Comfortable temps, another chance for storms for Thornton’s Wednesday

Wednesday, May 17th, 2017 5:03am MDT

We continue to see a shift in the weather pattern as another front moves through today. Its effects will be mainly in the form of slightly cooler temps and another round of thunderstorms. The real changes arrive tomorrow through Friday.

For today we start out with mostly to partly sunny skies above. Late morning will see things clear a bit before we start to see clouds increase in the afternoon. Temperatures will be topping out in the upper 60s, close to 70 degrees.

By mid to late afternoon we see chances for thunderstorms and showers although they are not expected to be anything extraordinary. Tonight, after about 9:00pm, rain coverage will increase and showers become likely through tomorrow.

Lows tonight will be chilly as the mercury dips to around 40 degrees.

The next low pressure system arrives tomorrow and that is going to bring in significant changes. High temperatures on Thursday and Friday will be only in the low to mid-40s coupled with respectable amounts of precipitation.

Thursday night into Friday morning we are going to temperatures drop to close to freezing and that will then help introduce a chance for snow early Friday morning. How much? Well, that is tough to tell yet with many variables at play. We could very well see an inch or two of the white stuff. However, it is also feasible we only see a mix of rain and snow with no accumulation at all. Certainly any that falls is going to melt quickly. We’ll have a better feel for things tomorrow when the system is closer.

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