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July weather preview: Hot temperatures, PM thunderstorms

Tuesday, June 28th, 2016 6:05am MDT

Change is of course the one constant in Denver’s weather but come July, things actually get pretty consistent.

The standard formula for a day in July is a sunny morning, clouds developing in the late morning and early afternoon. Come mid-afternoon, thunderstorms are rolling off of the foothills and into the metro area and the eastern plains. These storms do occasionally reach severe status containing hail, gusty winds and heavy downpours of rain.

Check out our July weather preview for a complete look at what is in store for the month ahead.

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June 26 to July 2: This Week in Denver Weather History

Sunday, June 26th, 2016 5:55am MDT
This Week In Denver Weather History

June 26 to July 2: This Week in Denver Weather History

Our look back at this week in Denver weather history certainly has plenty of the usual suspects related to severe weather. Most notable however are the many occurrences of lightning strikes and the effects they can have from sparking fires to causing significant injury and death.

From the National Weather Service:

25-26

In 1969…high winds raked Boulder causing one fatality and some injuries. One man was injured by a falling tree limb. At the National Center for Atmospheric Research in Boulder… Sustained winds of 55 to 60 mph with wind gusts to 123 mph were recorded. In downtown Boulder…winds averaged 30 to 40 mph with gusts to 70 mph. Widespread minor damage occurred… Especially in the Table Mesa area of south Boulder. Much tree damage occurred in the older areas of Boulder where several trees were uprooted. A mobile home was overturned by the winds. At Stapleton Airport…west winds gusted to 43 mph on the 25th and 37 mph on the 26th.

In 1975…strong winds damaged utility lines…buildings… vehicles…trees…and power lines in Boulder and other communities to the north of Boulder. Microburst winds gusted to 45 mph at Stapleton International Airport on the 25th.

In 1983…heavy rain fell in the foothills west of Denver with 1.50 inches in 30 minutes at Intercanyon. Heavy rain continued over metro Denver on the 26th with two-day storm totals at many locations ranging from 1.00 to 2.50 inches. Rainfall totaled 1.37 inches at Stapleton International Airport on the 26th.

In 1985…one to two inches of rain fell over metro Denver. At Stapleton International Airport…rainfall totaled 0.93 inches…thunderstorm winds gusted to 44 mph…and 7/10 inch hail was measured. The air mass was unusually cold for the season…and snow fell in the foothills above 8 thousand feet. The high temperature of only 63 degrees on the 26th equaled the record low maximum reading for the date.

26

In 1873…there was a great deal of smoke from a large forest fire in the mountains to the southwest of the city and a smaller fire directly to the west.

In 1874…fires at timberline to the west were visible from the city. New and extensive fires were continually started from south to northwest along the ridge line. Carelessness of tourists was the apparent cause of the fires. Large and valuable tracts of timber had already been destroyed.

In 1890…the only thunderstorm of the month produced a trace of rain. A trace of rain also fell on 7 other days. This was the only precipitation recorded during the month… Making it the driest June on record.

In 1893…northwest winds were sustained to 45 mph with gusts to 48 mph.

In 1971…a microburst wind gust to 58 mph was recorded at Stapleton International Airport. Dust devils were sighted.

In 1980…strong gusty thunderstorm winds damaged several mobile homes in Thornton. Thunderstorm winds gusted to 37 mph at Stapleton International Airport.

In 1986…hail piled up 1 1/2 inches deep in Golden Gate Canyon and covered roadways an inch deep in Evergreen.

In 1988…a tornado touched down 2 miles north of Watkins. It was on the ground for 15 minutes and did no reported damage.

In 1989…two inch diameter hail fell at Kassler…1 inch hail at Louviers…and 1 1/2 inch hail at tiny town.

In 1991…high winds…not associated with thunderstorms… Damaged a home in the Green Mountain area. The strong winds picked up a heavy metal and glass table on the deck of a house and threw it into the house. The table was destroyed and the house received considerable damage.

In 1992…3/4 inch diameter hail fell in south Aurora and near Buckley Air National Guard base. Golf ball size hail was reported in Parker.

In 1994…the all-time highest recorded temperature in June and the second highest temperature ever recorded in Denver… 104 degrees occurred. This was the hottest day in Denver since August 8…1878…when the temperature reached 105 degrees.

In 2005…strong thunderstorm winds gusting to 58 mph damaged a garage and some nearby trees near Fort Lupton. Winds also gusted to 58 mph near Watkins. Thunderstorm winds gusted to 60 mph near Roggen. Hail to 3/4 inch in diameter was measured in southwest Aurora.

In 2009…severe thunderstorms moving through Denver and the surrounding metro area produced intense thunderstorm winds. At Denver International Airport…a wind gust blew a luggage car into a southwest airlines airplane causing some damage. Peak wind gusts included: 68 mph at Denver International Airport…4 miles west of rocky mountain metropolitan airport and 12.5 miles north of Lowry AFB; 64 mph near Arvada and Parker; and 60 mph in Aurora/cherry.

26-27

In 1965…wind gusts to 38 mph were recorded in downtown Boulder…causing widespread minor damage. A microburst wind gust to 41 mph was recorded at Stapleton International Airport.

27

In 1873…Pikes Peak was hidden from view by smoke from forest fires in the mountains to the southwest of the city.

In 1927…the temperature cooled to a low of only 72 degrees… The all-time record high minimum for the month.

In 1980…lightning injured 4 people on a baseball diamond in Broomfield. The bolt seriously injured the pitcher while also striking (out) the batter…catcher and second baseman.

In 1987…a microburst wind gust to 53 mph was recorded at Stapleton International Airport.

In 1990…the temperature reached a high of 102 degrees… Setting a new record maximum for the date.

In 1993…thunderstorm winds gusted to 60 mph across parts of metro Denver. A wind gust to 50 mph blew over a 30-foot canvas tent at an amusement park southeast of Denver. Fifteen people…mostly children…were injured. Microburst wind gusts to 33 mph were recorded at Stapleton International Airport.

In 2002…heavy rain…up to 3/4 inch…fell across sections of the Hayman burn area near Cheeseman Reservoir. Several forest service roads were washed out and many culverts were plugged by debris.

In 2004…heavy rain producing thunderstorms caused rock and mud slides across the overland fire burn area in Jamestown. An estimated 50 tons of sand…dirt…rock…and ash slid into town…filling a culvert under main street. The slide covered 150 to 225 feet of main street. The flood was produced by half an inch of rain in 30 minutes. A deluge of very heavy rainfall from nearly stationary thunderstorms caused flooding and flash flooding problems over parts of Jefferson and Douglas counties. An automated rain gage in Golden measured 3.60 inches of rainfall in one hour. Numerous homes were flooded in Golden…including one that was 146 years old. The home was listed as a complete loss. State Highway 93 had to be closed from the Pine Ridge subdivision to the Golden Gate Canyon Road. At the height of the storm…about 4 feet of water covered State Highway 93 through Golden… Forcing its temporary closure. Several intersections were also flooded and impassable. Rock and mud slides were reported in Golden Gate Canyon state park. At the Deer Creek Golf Course at Colorado 470 and Kipling…the greens were completely inundated by floodwaters. Some backyards near the golf course were partially washed out. In Douglas County…water up to a foot deep covered the roadways in Roxborough State Park. The Waterton Canyon Road also had to be closed due to high water.

In 2010…a severe thunderstorm produced hail up to 1 inch in diameter near Strasburg. Hail up to 3/4 inch in diameter was reported in Aurora and Buckley Air Field.

28

In 1873…there was a great deal of smoke over the city from forest fires in the mountains.

In 1875…smoke from forest fires in the foothills south of Denver were visible from the city.

In 1913…an apparent dry microburst produced southwest winds sustained to 44 mph with gusts to 48 mph in the city.

In 1925…a thunderstorm produced north winds sustained to 38 mph with gusts to 44 mph.

In 1958…a microburst caused a brief wind gust to 58 mph at Stapleton Airport.

In 1964…lightning struck several homes in metro Denver… Sparking fires. Some flooding occurred in the stockyards area…at west 45th avenue and St. Paul Street…and along Harvard Gulch.

In 1997…strong microburst winds of unknown speed downed several trees…signs…and at least one light pole in the Fort Lupton area. Two trees knocked over by the storm downed power lines causing scattered outages.

In 2002…a thunderstorm wind gust to 60 mph was recorded in Parker.

In 2005…severe thunderstorms produced wind gusts to 66 mph near Longmont and to 60 mph near Niwot. No damage was reported. A thunderstorm produced a wind gust to 55 mph at Denver International Airport during the afternoon.
» Click here to read the rest of June 26 to July 2: This Week in Denver Weather History

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June 19 to June 25: This Week in Denver Weather History

Sunday, June 19th, 2016 7:00am MDT
This Week In Denver Weather History

June 19 to June 25: This Week in Denver Weather History

Heavy rain, flooding, lightning, tornadoes and hail are not at all uncommon this time of year and we see plenty of those types of events in our look back at this week in Denver weather history. Probably one of the most notable events occurred 10 years ago when a thunderstorms with large hail ripped through Denver International Airport causing $10 million in property damage and damaged dozens of airplanes.

From the National Weather Service:

19

In 1874…during the afternoon… Large columns of smoke from extensive fires in the mountain forests moved over the city from the west and southwest.

In 1875…while no precipitation was measured in the city… Rainfall over the Palmer Divide caused Cherry Creek to rise to the highest level in 10 years.

In 1977…hail up to 2 inch diameter damaged two patrol cars in Castle Rock.

In 1983 golf ball size hail fell just north of Bennett.

In 1990…lightning from a thunderstorm struck the roof of a house in south Boulder. Residents of the house were able to extinguish the ensuing fire with a garden hose…but not before several shingles had burned.

In 1992…thunderstorms produced hail up to 2 inches in diameter in central Douglas County near Castle Rock. Hail was 3 inches deep on I-25 south of Castle Rock. A funnel cloud was sighted near Parker.

In 1997…a 66-year-old man was knocked unconscious by a bolt of lightning while he was golfing at the eagle country club in Broomfield.

In 2000…dry microburst winds gusting to near 70 mph were reported across southeast Boulder and northern Jefferson counties. Peak wind gusts included: 68 mph at the national wind technology center…67 mph at Jefferson County airport… And 65 mph in Broomfield.

In 2001…severe thunderstorms produced large hail in the foothills southwest of Denver. Hail as large as 1 3/4 inch in diameter fell near conifer and Bailey.

In 2002…lightning damaged the Evergreen fire protection district radio repeater. One microwave transmitter…the main fire channel transmitter…and two solar panel controllers were destroyed. Lightning struck a garage and caused a small fire. Two vehicles parked in the garage were damaged. Hail to 3/4 inch in diameter fell near Castle Rock.

In 2004…severe thunderstorms produced hail to 3/4 inch in diameter near Castle Rock…Larkspur… And Golden.

19-21

In 1875…smoke from several large forest fires in the mountains was visible from the city on each of these days.

20

In 1888…northwest winds were sustained to 44 mph.

In 1956…a microburst caused a brief wind gust to 58 mph at Stapleton Airport.

In 1964…hail up to 1 inch in diameter was reported 1 mile north of Stapleton International Airport. A 3 minute hail storm at both Stapleton International Airport and lowry field piled small hail to one half inch deep.

In 1967…a strong thunderstorm dumped 1.95 inches of rain in less than an hour at Stapleton International Airport and produced a wind gust to 54 mph. The storm caused some flooding in east Denver and Aurora. There was widespread flooding to streets…basements… And store buildings and automobiles. Hail stones to 3/4 inch in diameter were measured at Buckley Field in Aurora. A tornado touched down just south of Littleton…damaging a barn and killing several head of cattle.

In 1985…a wind gust to 61 mph was reported at Golden Gate Canyon in the foothills west of Denver.

In 1986…a man was killed by lightning at Highlands Ranch south of Denver.

In 1987…several tornadoes were sighted across metro Denver. A tornado touched down briefly 5 miles west of Parker. A tornado was sighted just north of Chatfield Reservoir. A tornado just northwest of Watkins was on the ground for 15 minutes. A tornado near Barr Lake was taped by a television news crew. It had a double vortex and was on the ground for about 10 minutes. In addition to the 4 tornadoes…severe thunderstorms dumped large hail across metro Denver. One inch hail was reported in southeast Aurora; 3/4 inch hail fell at the Denver Technology Center…Buckley Field… And Franktown.

In 1992…several short-lived tornadoes occurred in the vicinity of Barr Lake. No injuries or damages were reported. A water spout was sighted over the southern end of Barr Lake. Funnel clouds were also sighted on the grounds of the rocky mountain arsenal by national weather service observers at Stapleton International Airport.

In 1994…hail up to dime size covered I-25 south of Denver and near Sedalia. Heavy rain caused local flooding on the interstate Highway.

In 1996…strong thunderstorm winds downed several large tree limbs in Boulder on the University of Colorado campus. A stop light in the city was also blown down.

In 1999…lightning sparked an oil tank fire near Brighton.

In 2001…large hail driven by strong thunderstorm winds raked Denver International and Front Range airports. Wind gusting to 54 mph along with hail as large 2 inches in diameter punched at least 14 thousand holes and cracks in the flat roofs of several buildings at Denver International Airport. In addition…93 planes and hundreds of cars were damaged. About 100 flights had to be cancelled…stranding 1500 travelers. The airport was completely shut down for about 20 minutes. The storm also damaged a ground avoidance radar used to track planes on the ground to prevent collisions. Damage was estimated at 10 million dollars…not counting the damage to the 93 airliners. The storm moved south and struck Watkins with hail as large as 2 1/2 inches in diameter and winds gusting to 60 mph. A least 30 private planes at Front Range airport were destroyed. The radome protecting the National Weather Service Doppler radar…which was tracking the storm…also sustained damage. The large hail…damaging winds… And heavy rain pummeled a mobile home park near Watkins. In the park…52 mobile homes… 14 recreational vehicles…3 homes… And a commercial building were damaged. Siding was riddled with holes and windows were broken. Vehicles sustained extensive damage and car windows were shattered. A handful of people were treated for minor cuts and bruises. The strong winds also flipped a tractor trailer along I-70 near Watkins. The storm caused power outages…which affected about 1200 residents. Excluding the damage at Denver International Airport…damage estimates totaled 49 million dollars…making the storm the costliest in the last 3 years and the 10th costliest since 1984. A small tornado touched down just east of Brighton… But did no damage. Hail as large as 2 inches in diameter fell near Fort Lupton with 3/4 inch hail measured in Bennett. Precipitation from the storm totaled only 0.23 inch at Denver International Airport.

In 2002…heavy rain fell near the Hayman wildfire burn area. Flash flooding washed out a 40-foot section of the access road to Cheeseman Reservoir. Some debris was washed against a gate…blocking the road. Hail to 1 1/2 inches in diameter fell near central city with 3/4 inch hail near Blackhawk.

In 2003…hail as large as 1 inch in diameter fell near Bennett and Strasburg with 3/4 inch hail measured in Denver…Golden… At Centennial Airport…and near Parker. Hail as large as 7/8 inch was reported in Arvada.

In 2004…a severe thunderstorm produced hail to 3/4 inch in diameter in and near Brighton.

In 2005…severe thunderstorms produced large hail near the palmer divide. Hail to 1 inch in diameter was measured near larkspur with 7/8 inch hail near Sedalia and 3/4 inch hail in Greenland. An apparent thunderstorm outflow produced a wind gust to 59 mph at Denver International Airport during the evening hours.

20-21

In 1897…high winds raked the city overnight. Southeast winds were sustained to 60 mph with gusts as high as 72 mph on the 20th. Southeast winds were sustained to 57 mph with gusts to 60 mph on the 21st.

In 2007…a brief hot spell produced two temperature records. The high temperature of 97 degrees was tied on the 20th. A new record high temperature of 99 degrees was established on the 21st.

» Click here to read the rest of June 19 to June 25: This Week in Denver Weather History

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Following a bit of a break Friday, the heat returns in full force for the weekend

Friday, June 17th, 2016 5:25am MDT

Today Thornton sees a slight respite from the heat we saw the last couple of days. That however is short-lived – and minimal – and this weekend will offer the warmest temperatures of the year thus far.

For Friday we start out with sunny skies to be followed by a few clouds by mid-afternoon. Late afternoon and evening bring just a slight chance for thunderstorms. Temperatures today will be topping out in the mid to upper 80s, a good bit cooler than yesterday but still a ways above normal.

Saturday should avoid any thunderstorm activity. Sunny skies will be above for the most part with only a few, scattered clouds. Temperatures are going to be climbing to the mid-90s.

We close out the weekend on Sunday with our hottest day of the three-day period. A healthy dose of sun aided by high pressure is going to lead to mercury readings in the upper 90s. Have a great weekend and (try to) stay cool!

Keep an eye on the thermometer here.

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Thursday’s key weather words: Hot and sunny

Thursday, June 16th, 2016 5:06am MDT

A healthy dose of sun above and temperatures above the 90 degree mark are the key features of Thornton’s weather today. That same pattern will be continuing into the weekend when mercury readings will make a push toward the upper 90s.

For today sunny skies will be the rule throughout the daytime. Winds will be light and out of the south. Look for the high temperature today to top out around 92 degrees, well above the average of 82 degrees for the date.

Looking ahead, Friday looks to be similar then Saturday we push to 96 degrees and a HOT 98 degrees potentially happening on Sunday.

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June 2016 top shots: Monthly photo slideshow

Thursday, June 16th, 2016 4:07am MDT
June 5, 2016 - A stunning Thornton sunset. (Shawn Jones)

June 5, 2016 – A stunning Thornton sunset. (Shawn Jones)

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 12, 2015

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!

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June 12 to June 18: This week in Denver weather history

Thursday, June 16th, 2016 4:06am MDT
This Week In Denver Weather History

June 12 to June 18: This week in Denver weather history

The first half of June is when Colorado’s severe weather season really kicks into high gear and our look back at this week in Denver weather history reflects that. Numerous flooding, hail, and tornadic events punctuate just how dangerous and damaging our weather can be this time of year.

From the National Weather Service:

11-14

In 1999…damage from several hailstorms in and near metro Denver totaled 35 million dollars. About 17.5 million dollars was from automobile claims with another 17.5 million in homeowner claims. The areas hardest hit by the storms included Castle Rock…Commerce City…Evergreen… And Golden.

12

In 1901…south winds were sustained to 45 mph with an extreme velocity to 47 mph.

In 1917…northwest winds were sustained to 40 mph with gusts to 45 mph.

In 1927…flooding on Little Dry Creek in Englewood resulted in two deaths.

In 1947…a trace of snow fell over downtown Denver during the early morning. This was the latest last snow of the season (trace or more). This also marked the end of the longest snow season…264 days…from the first snow…a trace…on September 22…1946. High temperature of 43 degrees was a record low maximum for the date. Minimum temperature of 33 degrees was a record low for the date.

In 1971…a funnel cloud sighted over Arvada possibly touched down at the base of the foothills. The public reported 3/4 inch to 1 inch diameter hail over the city of Denver.

In 1974…strong thunderstorm winds caused damage to power lines in metro Denver. Northwest winds gusted to 45 mph at Stapleton International Airport.

In 1975…a thunderstorm wind gust to 56 mph was recorded at Stapleton International Airport.

In 1982…three small tornadoes were sighted near Bennett. One of the twisters caused minor crop and road damage along its path. A brief tornado was sighted by national weather service observers at Stapleton International Airport.

In 1983…3/4 inch hail fell in Boulder. Golf ball to 3/4 inch size hail fell in Arvada…denting cars and house roofs. Over a thousand hail damage insurance claims were filed from the area. Golf ball size hail also fell in Northglenn and Bennett…1 to 2 inch hail in Thornton…2 1/2 inch hail in northeast of Denver. A tornado was sighted 10 miles northeast of Stapleton International Airport; it was only on the ground for 1 to 2 minutes.

In 1984…large hail pelted many parts of southern metro Denver. Fifteen aircraft were damaged by golf ball size hail at Centennial airport. Golf ball size hail was reported in south Denver…and 3/4 inch hail was measured in southeast Aurora.

In 1987…a small weak tornado touched down for about 3 minutes near the intersection of I-70 and Colorado Blvd in northeast Denver. No damage was recorded. A microburst wind gust to 53 mph was recorded at Stapleton International Airport.

In 1991…in the city of Denver…lightning struck a tree under which seven people were picnicking. One person was critically injured. The others received only minor injuries.

In 1992…golf ball size hail fell in Evergreen.

In 1994…microburst winds gusting to 53 mph kicked up some blowing dust at Stapleton International Airport.

In 1996…lightning struck a house in Parker…which sparked a fire. The bolt was strong enough to blow nails out of the drywall in one room. About 85 percent of the house was damaged. No dollar estimate of the damage was available. Lightning also struck a power line in Boulder…which left 250 customers without electricity for a short time.

In 1997…a tornado touched down near Parker…damaging some construction equipment. Hail to 2 inches in diameter was measured in Henderson. One inch diameter hail fell in the city of Denver with 3/4 inch hail measured in Lakewood.

In 1999…hail as large as 1 1/2 inches in diameter struck Hudson. A funnel cloud was sighted by ramp personnel to the east of Denver International Airport.

In 2003…lightning blew a hole in the roof of a house in Highlands Ranch. The bolt knocked several holes in the bedroom ceiling and damaged the home’s electrical system.

In 2004…lightning struck a home in Louisville…but caused only minor damage.

In 2006…a strong microburst wind gust…estimated at 69 mph… Ripped the roof off a horse barn near the intersection of Havana Street and Smith Road in Denver. A 13 year old girl was injured…when she was thrown from a horse inside the barn at the time the roof was being torn off. A thunderstorm produced a microburst wind gust to 54 mph and a trace of rainfall at Denver International Airport. A severe thunderstorm produced hail to 0.75 inch near Watkins.

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.

13

In 1956…a microburst caused a brief wind gust to 59 mph at Stapleton Airport.

In 1957…an unconfirmed tornado appeared to touch the ground in the vicinity of Franktown. No damage was reported from the twister.

In 1968…a violent gust of wind…possibly associated with a thunderstorm…caused 75 hundred dollars damage in Boulder.

In 1973…hail…1/2 to 3/4 inch in diameter…fell over Lakewood. Flash flooding occurred in west Denver from the same storm.

In 1974…a thunderstorm wind gust to 64 mph was recorded at Stapleton International Airport.

In 1977…hail the size of table tennis balls…1 1/2 inches in diameter…was reported in Boulder.

In 1981…large hail to golf ball size fell in Denver… Northglenn…and Brighton. Hail as large as baseballs was reported in federal heights.

In 1984…one of the worst hailstorms ever experienced in metro Denver struck the northwestern suburbs of Arvada…Wheat Ridge…and Lakewood…but large hail also fell in Golden… Southeast Denver…and Aurora. Homes and other buildings sustained around 200 million dollars in damage. Thousands of cars were battered by giant hailstones…and total damage to vehicles was estimated at 150 million dollars. In some areas…golf ball size hail fell continuously for 30 to 40 minutes. Some places were pelted with a few stones as large as grapefruits! Roofs on thousands of structures were severely damaged. Uncounted car windshields were broken; two-thirds of Arvada’s police cars were rendered inoperable. Torrential rains…with as much as 4.75 inches in Lakewood clogged drains and caused widespread damage from flooding. In some places hail was washed into drifts several feet deep. About 20 people were injured by the giant hailstones. One couple was hospitalized. A woman drowned when she was trapped under a trailer by high water. Only pea size hail fell at Stapleton International Airport.

In 1988…2 inch hail fell in Parker. Soft hail 1 inch in diameter fell at the mouth of turkey creek canyon 5 miles southeast of Morrison. Hail between 1 inch and 1 3/4 inches fell at both Bennett and Strasburg. A tornado touched down briefly at Strasburg. A brief funnel cloud was sighted by national weather service observers 15 miles southwest of Stapleton International Airport.

In 1991…a Boulder man was injured when struck by lightning while in a tent. He received only minor burns.

In 1997…lightning struck a home in Denver. The extent of the damage was unknown. A home in Littleton was also struck. The house caught fire…but the extent of the damage was not known.

In 1998…a strong mountain wave produced a brief period of high winds along the Front Range. A small building atop squaw pass west of Denver was blown down. Tree limbs were downed across metro Denver. Peak wind gusts included: 80 mph on Squaw Pass…69 mph at Jefferson County Airport near Broomfield…and 60 mph in Westminster and at the National Center for Atmospheric Research in Boulder. West-northwest winds gusted to 51 mph at Denver International Airport.

In 2001…high winds developed briefly in Boulder County. A peak wind gust to 76 mph was recorded at the National Center for Atmospheric Research atop the mesa in Boulder. A wind gust to 72 mph was recorded at southern hills middle school in Boulder. Lightning started a small fire…which damaged the roof of a house in Greenwood Village.

In 2009…severe thunderstorms produced hail up to one inch in diameter near Arvada and byers…as well as 7 miles north-northwest of Front Range airport near watkins.

13-14

In 2006…the high temperature of 99 degrees on the 13th equaled the record maximum temperature for the date first set in 1994. The high temperature of 102 degrees on the 14th was a new record maximum temperature for the date.

14

In 1877…an evening thunderstorm produced lightning which struck several houses and killed a cow in the bottom land of the South Platte River

In 1886…hail as large as 3/4 inch in diameter fell in the city. Precipitation was only 0.10 inch.

In 1887…south winds were sustained to 41 mph.

In 1900…a thunderstorm produced northwest winds to 51 mph with gusts to 61 mph…but only a trace of rain.

In 1923…a severe thunderstorm pelted the city with hail. The stones ranged in diameter from 0.2 to 0.8 inch. Gardens and greenhouses suffered considerable damage. Rainfall was only 0.14 inch downtown.

In 1960…one workman was killed and 4 others injured in Lakewood when a partly built apartment building collapsed in strong winds. Microburst wind gusts to 54 mph caused some blowing dust at Stapleton Airport.

In 1967…tornadoes touched down briefly 3 miles west of Franktown and 4 miles northeast of Parker. No damage was reported. Numerous funnel clouds were reported over south metro Denver…one 5 miles south of Denver…one 2 to 3 miles north of Castle Rock…and two near Littleton.

In 1968…a microburst wind gust to 52 mph was recorded at Stapleton International Airport.

In 1972…1 3/4 inch hail was reported in Wheat Ridge.

In 1976…high winds…unusually strong for this late in the season…raked metro Denver. Wind gusts estimated to 100 mph tore 24 boats from their moorings and damaged a total of 47 boats at Boulder reservoir. Wind gusts to 82 mph were recorded in Boulder. The strong winds toppled the wind mast at a radio station in Boulder. An automobile was smashed by a fallen tree in Boulder. Other damage in Boulder was minor…but power outages occurred when tree limbs fell on power lines. At Jefferson County Airport near Broomfield…wind gusts to 78 mph were recorded with 87 mph gusts clocked at Rocky Flats nuclear plant south of Boulder. Wind gusts to 66 mph were observed in Littleton… And northwest winds gusted to 46 mph at Stapleton International Airport. The strong winds collapsed a barn near Arvada. Several horses received minor injuries. Thirty trees were uprooted or broken in Denver. Four major power outages occurred from west Denver and Lakewood to the foothills.

In 1982…the worst hailstorm in 17 years struck Commerce City. The storm left 4 to 8 inches of hail on the ground. A few of the stones were as large as golf balls. Many vehicles were dented…and some windshields were shattered. Roofs of homes were damaged. Total damage was estimated at over one million dollars. Hail to 1 inch in diameter also fell in Littleton. Only 1/4 inch hail was measured at Stapleton International Airport.

In 1988…lightning ripped a small hole in the roof of a home in the southern part of Boulder. There were some power outages in the area.

In 1992…an off duty national weather service employee reported hail to 1 inch diameter in Westminster.

In 1997…one inch diameter hail fell in Bennett…and 3/4 inch hail was measured in Littleton.

In 1999…hail as large as 1 1/2 inches in diameter hit Aurora. Lightning sparked two small fires at separate residences near the Hiwan Country Club in Evergreen.

In 2004…lightning sparked two small fires near Jamestown. One was in Geer Canyon and the other 7.5 miles up Sunshine Canyon. Both were quickly contained and caused no damage to structures in the area.

In 2009…a complex of severe thunderstorm produced large hail damaging thunderstorm and funnel clouds across parts of the urban corridor. The line formed along a boundary over the western suburbs of Denver then moved east. The boundary produced at least one well defined funnel cloud that could be observed by stadium full of baseball fans at Coors Field. Large hail…up to 1 3/4 inches in diameter…was reported in Arvada…Broomfield…Denver…Federal Heights and Northglenn. In addition…the storm produced peak wind gusts from 60 to 74 mph. At Denver International Airport…a peak wind gust to 58 mph was observed from the west-northwest.

In 2014…severe thunderstorms broke out across the Urban corridor. Large hail…ranging in size from 1 to 2 inches in diameter…was observed. The area extended from around Englewood to Aurora and included: Brookridge…Cherry Knolls… Greenwood Village and south Denver. As many as 212 thousand residences were potentially impacted by the storms. The hail shattered windshields and damaged vehicles.

» Click here to read the rest of June 12 to June 18: This week in Denver weather history

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Wednesday offers lots of sun, rising temperatures

Wednesday, June 15th, 2016 5:17am MDT

Today’s weather forecast for Thornton is really quite short and simple. With high pressure dominating the region, conditions will be stable and unseasonably warm.

Sunny skies will be above throughout the day with just a few clouds here and there but none that will obscure the view. Winds will be calm during the daytime hours then become a bit breezy in the late afternoon and evening.

Temperatures will be climbing to a high of around 92 degrees, 10 degrees above normal. More of the same, hot weather will be in store for us through the week.

Keep an eye on the current mercury reading here.

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Lots of sun, mild temperatures for Thornton’s Tuesday

Tuesday, June 14th, 2016 5:10am MDT

Gone are the thunderstorms of the past few days and in its place is a warming, stable atmosphere. While the lack of storms might be nice to some, the mercury is going to be climbing in the coming days leading to an extended period of well above normal temperatures.

For today look for sunny skies to be above with only a cloud here and there. Winds will be light and conditions calm as we head for a high temperature in the mid-80s, just a bit above the average of 82 degrees.

Looking ahead, the balance of the week is going to just get warmer. Low to mid-90s will be seen Wednesday followed by highs in the mid-90s through Saturday.

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Monday starts the workweek with a significant severe weather threat

Monday, June 13th, 2016 5:05am MDT

Following on our hot and relatively calm weekend, things take a more serious turn on Monday. A healthy dose of moisture coupled with instability and shear are going to lead to an afternoon with the potential for large hail, damaging wind and possibly some tornadoes.

We start the day with mostly to partly sunny skies. By late morning a few more clouds will be seen. Temperatures will be climbing to a high right near the average for today’s date of 82 degrees.

A few thunderstorms could be seen as early as mid to late morning but the real threat begins this afternoon, particularly between about 2:00pm and 5:00pm as convection gets started in earnest.

With little to inhibit their development, these thunderstorms are going to find an atmosphere primed to allow quick and robust development. Large hail and damaging wind will be the biggest threats but we can’t rule out the potential for tornadoes as well.

Residents need to be very cautious today and pay close attention to the weather! Be sure to keep an eye on our Severe Weather Briefing Page for the latest.

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