75°F
Thornton, Colorado, USA
UpdatedFri, 19-Jul-2019 11:50pm MDT 
 

Navigation

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

 

Weather Geek Stuff - weathergeekstuff.com

Rocky Mountain Weather Network

Tony's Takes Photography

ThorntonWeather.com

Recent News and Posts


June 2019 top shots: Monthly photo slideshow

Sunday, June 30th, 2019 11:38am MDT
Lightning streaks across the skies over Thornton. (Chris Cox)

Lightning streaks across the skies over Thornton. (Chris Cox)

The month of June typically sees springtime severe weather reach its height of activity in northeastern Colorado.

This affords the opportunity to capture extraordinary images of amazing weather phenomena from monstrous supercell thunderstorms to heavy rain, hail and even tornadoes.

  • Slideshow updated June 30, 2019

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

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted.  June brings some very dynamic weather and the photos are a great way to see the stunning variety.

To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

What is missing in the slideshow above?  Your photo!

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

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

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

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

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

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

So come on, get those camera’s rolling!

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s weekend starts out hot, will end with a turn toward more seasonal temps

Friday, June 28th, 2019 4:59am MDT

A couple more days of unseasonably warm temperatures ahead for us. By the end of the three day period though, we will see things turn more seasonal, a trend that will last into next week.

Friday looks to be the hottest and calmest day. Temperatures will reach the mid-90s under sunny skies and we should avoid any thunderstorm activity. Tonight, partly cloudy skies will be above with highs in the low 60s. Saturday will see temperatures cool a couple of degrees.

Mostly sunny skies will be above. The afternoon and evening bring some scattered thunderstorm activity. Saturday night into Sunday, thunderstorms will end by midnight but cloud cover will linger. Lows will be in the low 60s.

The weekend closes out with temperatures closer to normal on Sunday. Some thunderstorms will again pop up in the afternoon.

Have a great weekend!

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s Thursday to see temperatures climb, just a slight chance for storms

Thursday, June 27th, 2019 4:51am MDT

Summer appears to have arrived in earnest. We will see mercury readings well above normal today and only have a very slight chance for a thunderstorm.

Mostly sunny skies start us off and will be with us throughout the day. Temperatures will climb quickly and be near the 90 degree mark by noon on their way to a high around 93 degrees. There will be just a slight chance for an afternoon thunderstorm.

Tonight, it will remain mild with lows around 60 degrees with mostly clear skies above.

Join the Discussion - Post your commentJoin the Discussion!

June 23 to June 29: This Week in Denver Weather History

Thursday, June 27th, 2019 2:59am MDT
This week in Denver weather history

June 23 to June 29: This Week in Denver Weather History

Late spring and early summer continue Colorado’s severe weather season. Looking back at this week in Denver weather history we see we experience a wide variety of conditions from record-setting heat to damaging thunderstorms with hail, wind and flooding.

From the National Weather Service:

23

In 1874…a thunderstorm pelted the city with hail and brief heavy rain. Rainfall was 0.30 inch in 10 minutes. Total rainfall was 0.36 inch for the day. Hail to 1/4 inch in diameter destroyed the strawberry fields near the limits of the city. The thunderstorm dropped the temperature from 93 degrees to 80 degrees in 5 minutes.

In 1887…north winds were sustained to 42 mph.

In 1954…the temperature climbed to a high of 102 degrees… Setting a record for the date.

In 1962…lightning struck and injured a man near Buffalo… southwest of Denver…while he was riding in the back of a pick-up truck. He suffered multiple bruises…cuts…and shock.

In 1965…an apparent tornado was reported 18 miles east of Denver. No damage was reported.

In 1975…hail up to 3/4 inch in diameter fell at Stapleton International Airport and over other parts of metro Denver. Four funnel clouds were sighted: 10 miles northeast of Denver…south of Boulder…southeast of Boulder…and south of Aurora.

In 1976…heavy rain and eroding water collapsed a retaining wall in Thornton.

In 1981…a thunderstorm produced wind gusts to 60 mph in Littleton.

In 1982…two separate bolts of lightning injured three men in southwest Denver. Two buildings were slightly damaged.

In 1987…severe thunderstorms produced large hail across metro Denver. Golf ball size hail fell in Littleton…near Morrison…and in southeast Aurora with 1 1/2 inch hail recorded in south Lakewood and 1 inch hail reported in Littleton…Arvada…and at Cherry Creek dam. Two funnel clouds were sighted 20 miles southwest of Stapleton International Airport.

In 1993…non-convective high winds developed along the Front Range foothills. Wind gusts to 70 mph were common near the foothills with numerous tree limbs broken by the winds. North winds gusting to 36 mph were recorded at Stapleton International Airport.

In 1999…hail as large as 1 inch in diameter was measured in the city of Denver with 3/4 inch hail in Littleton.

In 2001…a severe thunderstorm produced large hail in south metro Denver. Hail as large as 1 1/2 inch in diameter fell in Littleton with 1 1/4 inch hail near Sheridan.

In 2009…hail up to 1 inch in diameter was observed near Parker. At Denver International Airport…a total of 1.64 inches was measured in a 24-hr period…setting a new record for the date.

In 2014…severe thunderstorms produced large hail near Commerce City and Fort Lupton.  The hail sizes ranged from 1 to 1 1/2 inches in diameter.

In 2016…a severe thunderstorm produced a peak wind gust to 60 mph near Strasburg.

24

In 1873…there was a great deal of smoke from a fire in the mountains to the southwest of the city during the late afternoon.

In 1875…smoke from forest fires in the mountains to the southwest could plainly be seen from the city.

In 1958…a strong cold front produced a north wind gust to 55 mph at Stapleton Airport where blowing dust briefly reduced the visibility to 1 mile.

In 1982…one inch diameter hail pelted west Denver. A half inch of rain drenched the suburb of Englewood in 10 minutes. Hail piled up to 5 inches deep…snarling rush hour traffic and damaging some stores in a shopping center when the roof started leaking.

In 1988…lightning destroyed the chimney of a house near Evergreen. Another bolt demolished a radio transmitter in the area.

In 1989…golf ball size hail cut a swath 2 1/2 miles wide through open country 14 miles southwest of Bennett. The storm also dropped 1.75 inches of rain on the area. Hail to 3/4 inch in diameter damaged the car of a storm chaser just south of Bennett.

In 1996…a funnel cloud was sighted near Hudson where hail up to 1 3/4 inch diameter fell. Lightning struck a home in Littleton…which sparked a small fire on the roof. Thunderstorm wind gusts to 64 mph were recorded in Castle Rock.

In 2005…severe thunderstorms produced large hail across metro Denver. Hail as large as 1 inch in diameter fell near Castle Rock and Thornton. Hail to 3/4 inch was measured near Northglenn and Fort Lupton.

In 2006…severe thunderstorms raked metro Denver. Hail as large as 2 1/2 inches in diameter shattered automobile windshields in and near Boulder. Hail to 1 3/4 inches pounded areas in and near Lakewood and Morrison. Hail to 1 inch was measured in Wheat Ridge along with 7/8 inch hail in Arvada. Severe thunderstorm wind gusts estimated to 69 mph snapped power lines for a distance of one quarter mile near Castle Rock. Severe thunderstorm winds were measured to 60 mph in Sedalia. Hail as large as 1 inch in diameter fell near Evergreen and Castle Rock. Hail to 3/4 inch in diameter was reported in Louviers and near Conifer.

In 2014…damaging hail…from 1 to 2 inches in diameter… caused extensive damage to homes and automobiles over parts of Arapahoe and Douglas Counties including areas in and near:  Aurora-Cherry Creek…Buckley Air Force Base…Denver International Airport and Parker.  Officially…0.06 inches of rain fell at Denver International Airport…with a peak wind gust of 33 mph from the southeast.

In 2015…two colliding outflow boundaries merged over east Denver and northwest Aurora at the height of rush hour. The collision quickly spawned a severe thunderstorm that produced an EF1 tornado…damaging hail…torrential rain and flash flooding. The tornado touched down in east Denver and west Aurora. The tornado first touched down near Quebec and 6th Avenue. It then moved east northeast across the Lowry Campus into the west part of Aurora. The tornado then lifted near Mount Nebo Memorial Park. Some homes had minor roof damage with one former apartment building on the Lowry Campus had more significant roof damage. The tornado and intense thunderstorm winds uprooted trees…damaging vehicles and blocking roads. The storm produced torrential rain…2 to 2.5 inches…much of which fell in less than 30 minutes and resulted in flooded intersections and power outages. Flash flooding forced the evacuation of a theater at the Cherry Creek Shopping Center…where drifts of hail formed in the parking lot…and flooding set off alarms at the University of Denver`s Ritchie Center. Numerous water rescues were reported as vehicles stalled flooded intersections. Many stoplights were knocked out. The water was reportedly 3 feet deep on the South Broadway ramp to Interstate 25. The bike path along Cherry Creek was inundated with several feet of water at the height of the storm. Ironically…it was “Bike to Work Day”…which made for a long commute home for many.  The South Platte River crested above flood stage for one hour. Employees still at work were urged to stay inside but others waded across flooded intersections downtown. About 30 flights had to be diverted from Denver International Airport.  At Denver International Airport… only 0.05 inches of rain fell.  A peak wind gust to 47 mph was observed from the southeast.

25

In 1873…forest fires produced a great deal of smoke in the mountains to the southwest of the city.

In 1958…an unusually cold day for summer set two temperature records for the date. Under cloudy skies with occasional drizzle…a record low maximum temperature of 55 degrees was established along with a record minimum temperature of 42 degrees.

In 1959…a waitress…working at a kitchen sink…was injured by a bolt of lightning…which struck the rear of a tavern in Denver. She was hospitalized.

In 1971…a tornado touched down briefly at a high school football field in Brighton…but caused no damage.

In 1981…3/4 inch hail pelted Wheat Ridge and hail to 1 1/4 inches fell in Louisville. A brief funnel cloud was sighted by national weather service personnel 4 miles east of Stapleton International Airport.

In 1982…a bolt of lightning struck a cabin in the foothills west of Denver. The resulting fire totally destroyed the cabin.

In 1987…golf ball size hail fell near Bennett.

In 1988…a tornado touched down 1 mile south of Watkins and was on the ground for 4 minutes. Another tornado was spotted just southeast of Barr Lake and was on the ground for 5 minutes. No damage was reported from either tornado. Lightning struck two rock climbers near Eldorado Springs. A 25-year-old man was killed…and a 21-year-old man suffered extensive injuries. Thunderstorm winds knocked over two elm trees near downtown Denver. One fell on a house destroying most of it. A nearby building was unroofed…and two cars were damaged. A truck that had been severely damaged by one of the Denver tornadoes 10 days before was hit again. Thunderstorm wind gusts to 51 mph were recorded at Stapleton International Airport.

In 1991…the temperature reached a high of 100 degrees… Setting a new record for the date.

In 1997…one inch diameter hail fell in Arvada and 1 1/2 inch hail in Boulder. Hail as large as 3/4 inches fell in Denver…Louisville…Westminster…and near Broomfield.

In 1999…thunderstorm winds gusted to 58 mph near Fort Lupton toppling an oil rig. A 37-year-old man was killed when he fell 55 feet from the derrick of the rig.

In 2001…four golfers and one construction worker received minor injuries from a nearby lightning strike on the Broadlands Golf Course in Broomfield.

In 2002…hail to 1 inch in diameter was measured in Greenwood Village.

In 2005…hail to 3/4 inch in diameter fell near Bennett and Roggen. A thunderstorm wind gust to 61 mph was recorded near Golden.

In 2009…lightning struck the Darlington Prismatic Electric Fountain in City Park’s lake. The damage was estimated to be approximately $25000.

In 2010…wind gusts associated with a dry microburst downed several trees in the vicinity of 14th and federal…and near Bayaud St. and Clarkson St. In Denver. At Denver International Airport…a peak wind gust to 45 mph was observed from the southwest.

In 2015…severe thunderstorms developed late in the afternoon and continued in the late evening hours. The storms moved over parts of Adams…Arapahoe…Douglas and Weld Counties. The largest hail occurred near Aurora and Keenseburg…with hail up to tennis ball size or 2 1/2 inches in diameter. Elsewhere…the hail size ranged from nickel to half dollar size. At Denver International Airport…just a trace of rainfall was observed.  A peak wind gust of 31 mph was also observed from the east.

» Click here to read the rest of June 23 to June 29: This Week in Denver Weather History

Join the Discussion - Post your commentJoin the Discussion!

Astronomical summer set to arrive, bring the longest day of the year

Friday, June 21st, 2019 8:29am MDT
On the June solstice, the Earth’s northern hemisphere is tilted at its maximum toward the sun. The result is the longest day of the year for the northern part of the planet. (NASA)

On the June solstice, the Earth’s northern hemisphere is tilted at its maximum toward the sun. The result is the longest day of the year for the northern part of the planet. (NASA)

Astronomical summer will arrive in Thornton this morning and with the solstice we will enjoy our longest day of the year.

Summer officially begins at 9:54am MDT this morning.  The Summer Solstice occurs when the North Pole is tilted at it closest to the sun – 23.4 degrees.  This results in the longest day of the year in the Northern Hemisphere.

Here in Denver the sun rises at 5:32am today and sets at 8:31pm.  This will give us 14 hours, 59 minutes and 14 seconds of daytime.

Tomorrow it will be a bit less than one second shorter than today and each day from now through the Winter Solstice in December will get gradually shorter as well.

At the poles of the globe, the seasonal extremes will be quite notable.  Areas north of the Arctic Circle to the North Pole will see 24 hours of daylight and have a midnight sun.  On the opposite end of the globe, the South Pole will have no direct sunlight at all as they are in the depths of their winter.

Did you know that there is a difference between the astronomical seasons that we are discussing here and meteorological seasons?

Meteorological seasons differ slightly and are geared toward matching the calendar with the annual temperature cycle. This is done primarily for meteorological observing and forecasting and in many ways it is more logical than the astronomical seasons.

For the Northern Hemisphere, the meteorological spring covers the months of March, April and May. Summer brings the hottest months of the year and so meteorological summer is June, July and August. Meteorological fall then is September, October and November followed by the coldest months of December, January and February as meteorological winter.

Join the Discussion - Post your commentJoin the Discussion!

Cool and unsettled weather arrive for Thornton’s weekend

Friday, June 21st, 2019 5:26am MDT

A series of disturbances are going to bring significant changes to our weather for the three day period. Temperatures will be well below normal and daily thunderstorms and showers will be likely.

For today, we will see some sun initially but clouds will arrive by the afternoon along with gusty winds. Temperatures will only be in the upper 60s. Early afternoon brings a chance for showers and thunderstorms with the best opportunity coming after 3:00pm. Some of these storms will have the potential to turn severe with large hail and damaging wind.

Showers will continue overnight with lows down to the upper 40s.

Saturday will be the coolest day with highs in the mid-60s. Partly sunny skies will be above. Sprinkles of rain will be possible in the morning with showers becoming more widespread in the afternoon and into the evening.

Saturday night into Sunday morning, skies will clear a bit after midnight with lows down to the mid-40s.

Sunday will see things settle down a bit. Highs will bounce back to the upper 60s with partly sunny skies. There will be a chance for some PM thunderstorms.

Stay alert and be aware of the changing weather conditions. Keep an eye on our Severe Weather Briefing Page for the latest.

Join the Discussion - Post your commentJoin the Discussion!

Near normal temperatures, just a slight chance for thunderstorms Thursday

Thursday, June 20th, 2019 5:12am MDT

The last full day of spring brings to Thornton a largely typical day for this time year. Temperatures will be close to average for the date and the afternoon and evening bring some isolated thunderstorms.

Mostly sunny skies will be above until the early afternoon when clouds will increase a bit. High temperatures today will be in the mid-80s.

We will see just a slight chance for thunderstorms from about 2:00pm until just after dark. At this time, activity should be pretty isolated and any that do pop will offer gusty winds, perhaps a little bit of rain.

Tonight, skies will be partly cloudy with lows in the mid-50s.

Join the Discussion - Post your commentJoin the Discussion!

June 16 to June 22: This Week in Denver Weather History

Wednesday, June 19th, 2019 1:27pm MDT
This week in Denver weather history

June 16 to June 22: This Week in Denver Weather History

Late spring and early summer weather hazards abound in Colorado. Looking back at this week in Denver weather history we see many examples including wildfires, deadly lightning, damaging lightning and dangerous flooding.

From the National Weather Service:

12-17

In 2000…two large wildfires developed in the Front Range foothills as careless campers and very dry conditions proved to be a dangerous combination. Strong winds gusting in excess of 60 mph on the 13th fanned the flames… Spreading both wildfires out of control. Winds gusted to 78 mph atop Niwot Ridge near the Continental Divide west of Boulder. The Hi Meadows wildfire…about 35 miles southwest of Denver…consumed nearly 11 thousand acres and 80 structures…mostly high priced homes. The Bobcat wildfire…located about 12 miles southwest of Fort Collins… consumed nearly 11 thousand acres and 22 structures. Late on the 16th…a strong cold front moved south over the great plains into northeastern Colorado. Low level upslope conditions developed in the wake of the front…producing 2 to 4 inches of snowfall overnight at elevations above 8 thousand feet. Firefighters were able to contain both fires shortly thereafter.

15-16

In 1963…heavy rain and hail ravaged metro Denver. In southeast Denver…heavy rain flooded homes and streets. Hail to a depth of 4 inches on the ground stripped trees and plants and drifted to depths of 3 to 4 feet in some areas. Flood waters on the valley highway were 19 feet deep in places…trapping many cars. Many creeks were running over their banks. On the 15th…the main thunderstorm cell passed over south Denver…dumping as much as 4 inches of rain in 90 minutes. Precipitation at Stapleton Airport totaled 0.91 inch on the 15th and 1.31 inches on the 16th. A funnel cloud was sighted briefly 4 miles to the south-southeast of Stapleton Airport on the 15th. Damage from hail and flooding amounted to near a million dollars.

16

In 1950…very heavy rain and hail storms in southwest Denver caused an estimated 750 thousand dollars in hail and flood damage. Thunderstorms produced 2.06 inches of rain at Stapleton Airport with 2.23 inches of rain measured in downtown Denver.

In 1965…a tornado…15 miles south-southeast of Denver… Touched down and damaged two houses in northern Douglas County. Three golfers at a country club and a women who lived north of Castle Rock were injured by falling structures.

In 1983…a microburst wind gust to 54 mph was recorded at Stapleton International Airport.

In 1984…a tornado touched down briefly in Parker. No damage was reported.

In 1986…lightning injured 5 people just north of the Denver city limits in Adams County. The victims were members of a drum and bugle corps and were standing near a metal scaffold. Heavy rain from the storm also caused street flooding in the metro area.

In 1991…hail to golf ball size fell at Conifer.

In 1992…a rare mid-June high wind event wreaked havoc over metro Denver when a pacific cold front moved across the Rocky Mountains. Strong winds at speeds of 40 to 50 mph were common along the Front Range foothills. Winds reaching 107 mph in the foothills west of Denver and 79 mph at Longmont…caused damage ranging from trees being toppled to large trucks being rolled over. Strong winds estimated at 75 mph rolled a 35-foot truck carrying building supplies on U.S. Highway 36 north of Boulder. The truck driver and a passenger as well as the driver of another car were slightly injured. The winds downed power lines. The gambling towns of central city and Blackhawk were without power for a couple of hours. West winds reached 43 mph at Stapleton International Airport.

In 1996…a small tornado touched down in the foothills southwest of Boulder near Pinecliffe…knocking down 50 to 100 large pine trees. A house nearby sustained damage when shingles were ripped from the roof. The tornado also picked up a 17-foot sailboat with attached trailer and carried it 25 feet into a nearby tree. In addition… Thunderstorm wind gusts to 46 mph were measured at Denver International Airport.

In 2004…hail as large as 1 inch in diameter fell near Castle Rock. Hail to 3/4 inch was measured near Bennett.

In 2005…severe thunderstorms produced hail as large as 1 inch in diameter in Centennial.

In 2011…severe thunderstorms produced and damaging across parts of metropolitan Denver. In Lakewood…a tree blew down and landed on at least five cars. At Centennial Airport…a section of a roof on a hangar was ripped off the strong winds. A peak wind gust of 46 mph was recorded at Centennial Airport and Denver International Airport in the evening.

16-17

In 1965…on the afternoon and evening of the 16th…violent thunderstorms produced extremely heavy cloudbursts of rain over the palmer divide and sent a wall of water as high as 20 feet down both branches of Plum Creek into the South Platte River and through metro Denver. The heavy rainfall produced the most devastating flood in the history of Denver. Rainfall totaled 14.0 inches in 3 hours at both Larkspur and Palmer Lake with 12.0 inches recorded in Castle Rock. The flood waters caused extensive damage to roads and bridges in larkspur…Castle Rock…and Sedalia…including washing out the I-25 bridge over East Plum Creek in Castle Rock. The citizens of metro Denver received reports of the flooding to the south and had a few hours to initiate evacuation procedures along the South Platte River…greatly limiting the loss of life. By evening…the flood reached Littleton where a heroic effort was made to save nearly 150 horses at the Centennial Racetrack…which was completely inundated by the flood waters. As the flood proceeded through the city of Denver…the river became more than 1/2 mile wide and destroyed all homes…trailer courts… And businesses in its path. The waters contained debris ranging from refrigerators to old cars. As many as 26 bridges were damaged or destroyed…including the 6th Avenue freeway bridge across the South Platte. Both Public Service Company power plants were shut down by the flood. The King Soopers grocery chain bakery was inundated. About midnight… The torrent crested at 25 feet above normal with flow exceeding 40 times normal and is the record flood on the South Platte and many of its tributaries. The flood caused 230 million dollars in damage and 8 deaths along the entire South Platte River basin. The intense rain also caused flooding along Cherry Creek in Denver…on Toll Gate and Sand Creeks in east metro Denver…and on Kiowa and Bijou creeks to the east of Denver. The South Platte River flood closed nearly every major east-west highway into Denver…nearly isolating the city. The flood caused heavy damage to state and county roads in the area. Railroads were also hard hit with the main yards in lower downtown inundated. Sewerage… Water supply facilities…and irrigation works also received heavy flood damage. The flood crest did not reach Nebraska until the 20th.

17

In 1915…northwest winds were sustained to 41 mph with an extreme velocity to 42 mph.

In 1967…this was the 24th consecutive day with a trace or more of precipitation from May 25th. Precipitation totaled 5.87 inches during the period…more than a third of the average yearly total.

In 1975…hail more than 2 inches in diameter fell in eastern Aurora.

In 1977…golf ball size hail was reported 3 miles east of Arapahoe County airport…now Centennial Airport. Heavy hail to 3/4 inch in diameter was reported in Littleton… Castle Rock…and Sedalia.

In 1979…a man and a girl were struck and killed by lightning while walking in a park in northwest Denver.

In 1987…3/4 inch hail fell near Boulder.

In 1991…a microburst wind gust to 59 mph kicked up some blowing dust at Stapleton International Airport.

In 1998…hail as large as 3/4 inch in diameter fell in Boulder.

In 2003…lightning struck a feeder line…knocking out the electricity to about 3000 residents in Littleton. A lightning strike caused minor damage to the roof and attic of a home in Lafayette. Another lightning strike caused minor roof damage to a residence in Louisville. Yet another lightning strike hit a home in Denver and caused a small attic fire. Hail as large as 1 inch in diameter was measured near Centennial Airport and near Greenland.

In 2009…hail up to 1 inch in diameter was measured near Longmont.

In 2015…a severe thunderstorm produced hail up to 1 1/2 inches in diameter near Arapahoe Park…and up to 1 inch in diameter near Parker.

17-18

In 1964…high winds at speeds of 50 to 60 mph with gusts as high as 75 mph caused damage to homes…power lines…and trees in Boulder. Non-convective west winds gusting to 46 mph caused some blowing dust at Stapleton International Airport on the 17th.

18

In 1875…a windstorm produced sustained winds to 45 mph during the morning hours. Numerous forest fires along the base of the mountains were visible from the city.

In 1886…northwest winds sustained to 40 mph were the strongest of the month that year.

In 1987…severe thunderstorms produced lightning…large hail… A tornado…heavy rain…and strong winds across metro Denver. Rainfall totaled 2.50 inches in an hour in Wheat Ridge… Causing minor flooding. I-25 was flooded in north-central Denver…snarling traffic. Hail 7/8 inch in diameter fell in Louisville with 1 1/2 inch hail near Golden and 1 to 1 3/4 inch hail in and near Castle Rock. A tornado touched down briefly in Castle Rock. No damage was reported. Lightning started a small fire that burned half a cabin near Evergreen.

In 1994…a funnel cloud was sighted over Aurora; hail to 1 3/4 inch diameter fell near Brighton; and hail over an inch in diameter fell over Aurora…southeast Denver… Louisville…and Boulder. Lightning struck a home in Henderson 9 miles north of Denver and knocked a hole in the roof…which caused the ceiling to collapse. Hail to 1 1/4 inch diameter was measured at Stapleton International Airport.

In 2002…the Hayman wildfire in the foothills to the southwest of Denver intensified…and the winds aloft carried the smoke plume directly over metro Denver…again creating a dense haze of smoke which blocked the sun. Surface visibilities were again reduced to as low as 1 1/4 miles at Denver International Airport.

In 2004…severe thunderstorms produced hail to 3/4 inch in diameter near Morrison…in Littleton…near Conifer…near Castle Rock…and in Aurora near Cherry Creek.

In 2013…a landspout tornado touched down at DIA. The tornado sent 10 thousand travelers on the concourse…on planes and in the terminal scrambling to get into tornado shelters. The tornado formed just to the south of Runway 35R and then moved slowly northwest between Runway 35R and 35L…and moved to within one third of a mile of Concourses A and B before dissipating. The tornado moved extremely close if not over the ASOS (Automated Surface Observation System) and another low level wind shear sensor at DIA. The ASOS weather observing system reported a 97 mph wind gust…while the wind shear sensor reported a wind gust to 109 mph at the same time indicative of an EF1 tornado. There was only minor damage noted to the equipment. Nine flights were diverted elsewhere during a tornado warning. Severe thunderstorms also produced large hail up to quarter size in Adams and Weld Counties.

In 2014…a severe thunderstorm produced large hail up to quarter size near Buckley Air Force Base. At Denver International Airport…a peak wind gust to 55 mph was observed from the southwest…along with 0.37 inches of water.

In 2015…a severe thunderstorm produced hail…from quarter to half dollar size…near Lafayette…Louisville and Superior.

» Click here to read the rest of June 16 to June 22: This Week in Denver Weather History

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s Wednesday warms up, dries out

Wednesday, June 19th, 2019 4:52am MDT

Stable weather conditions return to the Front Range today. Temperatures will be near normal and we should avoid any thunderstorms.

Mostly sunny skies start us off and will be with us throughout the day. Winds will be calm much of the day, becoming a bit breezy in the evening.  High temperatures today will warm to the low 80s.

Tonight, partly clear skies will be above with lows in the mid-50s.

Join the Discussion - Post your commentJoin the Discussion!

Tuesday brings another day of unsettled weather conditions, cooler than normal temps

Tuesday, June 18th, 2019 4:57am MDT

Following yesterday’s nice batch of showers, Thornton stands another good chance to see more today. Temperatures will continue to be cooler than normal as well.

The day starts with mostly cloudy skies and overall we won’t be seeing much sun through the day. High temperatures will top out in the mid-70s.

A few sprinkles of rain may come by late morning and into the early afternoon. By about 2:00pm and into the evening showers and thunderstorms will become more widespread. Some brief heavy rain, perhaps some small hail will be possible.

Tonight, skies will gradually clear with lows in the low to mid-50s.

Keep an eye out for the showers with our interactive weather radar here.

Join the Discussion - Post your commentJoin the Discussion!