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Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUL 5 2025

...This week in metro Denver weather history...

29-15 In 2000...the 29th marked the beginning of a near record hot
        streak for metro Denver.  The high temperatures...as recorded
        at Denver International Airport...exceeded the 90 degree mark
        for 17 consecutive days from June 29th through July 15th.
        The record of 24 consecutive 90 degree or above days was
        set from July 13th through August 5th...2008.
1-18  In 1874...a streak of 18 consecutive days of 90 degrees...from
        the 1st to the 18th...tied for second with another streak
        that was later set in the summer of 1901. The record of 24
        consecutive days was established in the summer of 2008.
4-8   In 1989...one of the most intense heat waves on record roasted
        metro Denver.  The temperature reached 100 degrees or more
        on 5 consecutive days.  The city had previously never
        recorded more than 2 straight 100-degree days since records
        began in 1872.  Water and electricity usage reached all time
        highs.  The heat wave created extremely dry weather
        conditions...which contributed to a major forest fire in
        Boulder Canyon on July 9th.  The temperature reached 103
        degrees on the 8th...and the mercury climbed to 101 degrees
        on both the 4th and 5th...and to 102 degrees on both the
        6th and 7th.  The low temperature of 68 degrees on the 8th
        equaled the record high minimum for the date.
6     In 1876...the high temperature reached 101 degrees in
        downtown Denver.
      In 1943...four people were injured by lightning in Denver
        during a severe early evening thunderstorm.  At least
        two houses were set on fire by the lightning.  One house
        had $1500 in damage and the other $1000.
      In 1959...wind and lightning caused some damage in metro
        Denver.  Wind gusts to 67 mph blew down power lines...signs...
        and trees.  Lightning struck several transformers...leaving
        many areas without power.
      In 1971...a microburst wind gust to 68 mph was recorded at
        Stapleton International Airport.
      In 1973...the temperature reached a high of 103 degrees.
        This was the second consecutive day with a temperature
        of 100 degrees or more.
      In 1984...a weak tornado moved through eastern Aurora.  About
        10 homes sustained minor damage to roofs; some sections of
        fence were thrown more than a block.  Soft hail...an inch in
        diameter...fell over central Aurora...and 1.35 inches of rain
        fell in just 45 minutes...5 miles east of Buckley Field.
        Torrential rain and hail stopped traffic on I-225 in central
        Aurora for 15 minutes.  Street flooding was widespread.  A
        wind gust to 57 mph was recorded in southeast Aurora.  A
        wind gust to 66 mph was reported at Front Range Airport near
        Bennett.  Northwest winds gusted to 44 mph at Stapleton
        International Airport where only 1/8 inch hail fell.
      In 1986...one inch diameter hail fell near Conifer in the
        foothills west of Denver.  The storm produced 1.50 inches of
        rain in an hour with a storm total of 2.15 inches.  Nearby
        Buffalo Creek was drenched with 0.80 inch of rain in
        just 10 minutes.
      In 1996...3/4 inch diameter hail fell in Bennett...east of
        Denver.  Hail...as large as 1 1/2 inches in diameter...
        damaged several vehicles in the parking lot of the
        Colorado Speedway race track near Dacono north of Denver.
        Several trees were also damaged.
      In 2001...a severe thunderstorm wind gust to 59 mph was
        recorded at Denver International Airport...along with small
        hail.
      In 2009...hail up to 1 inch in diameter was observed near
        Longmont.
      In 2010...heavy rain caused flash flooding near Interstate 70
        at the Byers exit.  Two feet of water was observed moving
        across the bottom of exit ramp.  One car was washed into a
        tree but no one was injured.  In addition...severe
        thunderstorms produced hail up to 1 1/2 inches in diameter
        near Franktown.  At Denver International Airport...only 0.01
        inches of rainfall was observed.  A peak wind gust to 45
        mph from the west was also recorded.
6-23  In 1901...from the 6th to the 23rd...a streak of 18 consecutive
        days of 90 degrees tied for second with another streak set
        in the summer of 1874. The record of 24 consecutive days was
        established in the summer of 2008.
7     In 1905...a thunderstorm produced sustained northeast winds
        to 40 mph...but only a trace of rain.
      In 1933...heavy cloudbursts during the afternoon in the
        Idledale area and on Saw Mill Gulch caused flash flooding
        on Bear Creek resulting in 7 deaths.  Flooding in Morrison
        was compounded when a wall of water as high as 15 feet
        swept down Mount Vernon Creek.  The flooding caused
        extensive damage to the Bear Creek Canyon highway.
      In 1959...wind gusts to 45 mph at Stapleton Airport...but higher
        in other areas...damaged power lines and buildings and caused
        widespread minor damage from falling trees and broken limbs.
        A field house under construction at Adams County High School
        in Commerce City sustained severe damage.
      In 1963...farm buildings east of Boulder were possibly damaged
        by a small tornado as there were unconfirmed reports of a
        funnel cloud in the area.
      In 1967...a storm of cloudburst proportion caused damage from
        flooding in southwest and south Denver.  Unofficial reports
        indicated rainfall of 2.00 inches in 30 minutes and more
        than 3.00 inches total from the storm.  Streets and
        buildings were flooded by the heavy run-off.  Hail in some
        areas contributed to flooding by blocking storm drains.
        Water accumulated 12 to 14 feet deep in several underpasses
        and some street intersections.  A young woman drowned when
        she tried to cross a flooded street and was swept off her
        feet and trapped under a parked car.  Water reached a depth
        of 5 feet in the street.  Police rescued numerous stranded
        motorists.  The roof and wall of a flat roofed store
        building collapsed under the weight of deep water on the
        roof.  Cars were washed over curbs in many areas.  In
        southwest metro Denver...100 to 150 homes were flooded.
        Hail caused damage in other areas of Denver and in Aurora.
        Wind toppled trees in several areas.  Snowplows were called
        out to clear hail from some highways and runways at
        Stapleton International Airport.  Lightning damaged trees
        and power lines and started a fire...which extensively
        damaged an automobile dealership.  Thunderstorm rainfall
        totaled 0.83 inch at Stapleton International Airport.
      In 1981...severe thunderstorms produced 3/4 inch hail over
        east Denver.  About 1 1/2 inches of rain fell in
        Littleton.  Thunderstorm winds gusted to 45 mph at
        Stapleton International Airport.
      In 1983...tennis ball size hail fell about 5 miles north of
        Boulder; it was soft and caused no damage.
      In 1987...a weak tornado touched down in Castle Rock.  Several
        weak tornadoes were observed in the area.  No damage was
        reported.
      In 1988...lightning struck a sign at a bank near Louisville...
        damaging it and causing a smoldering fire that resulted in
        smoke damage to the bank and an adjacent building.  Heavy
        thunderstorm rain...accompanied by 1/2 inch diameter hail at
        Stapleton International Airport...briefly reduced the
        visibility to 1/4 mile.  Rainfall totaled 1.41 inches...
        but 1.12 inches fell in 32 minutes.
      In 2001...severe thunderstorms dumped large hail across north
        metro Denver.  Hail to 1 3/4 inches in diameter fell near
        Erie with 7/8 inch hail measured in Thornton.
      In 2004...a 9-year-old boy was struck by lightning while at
        a playground in Arvada.  The umpire at a nearby baseball
        game...along with 2 passers-by...administrated CPR and
        resuscitated the boy who had quit breathing.  The boy
        suffered first and second degree burns...but was released
        from the hospital in less than 24 hours.  A dry microburst
        over Denver International Airport produced a peak wind gust
        to 61 mph.
      In 2006...up to 3 inches of heavy thunderstorm rainfall in
        the Hayman wildfire burn area produced destructive flash
        flooding along West Creek between the towns of Deckers and
        Westcreek in southwest Douglas County.  Horse Creek...which
        drains into West Creek...swelled from a normally small creek
        into a raging torrent...25 to 30 feet deep and 300 feet wide.
        The wall of water damaged or destroyed about 30 sections of
        a 5 mile stretch of State Highway 67...which parallels West
        Creek.  Several homes were extensively damaged or destroyed.
        No injuries were reported...but several people had to be
        rescued...due to extensive damage to access roads and bridges
        in the area.  Reconstruction was estimated at 13.3 million
        dollars.
      In 2011...Heavy rain associated with a wet microbursts produced
        over 3 inches of rain in 90 minutes across southeast Denver.
        In Denver...some underpasses were flooded with several feet
        of water which stranded motorists. As a result...the fire
        department conducted at least 10 water rescues. Some
        basements were inundated with up to 4 feet of water which
        caused extensive flood damage. The Platte Valley and
        Western Model Railroad Club`s model train display in Union
        Station was also damaged when 3 to 4 inches of mud and water
        spilled over some of the command and control systems. Several
        display modules and scenery pieces in a storage room were
        also damaged. The entire display spanned more than one
        thousand feet of track in a room that was once used as the
        jail at Union Station in the 1900s. Urban and small stream
        flooding was reported across the surrounding Denver suburbs.
        The storm left about 28000 Xcel customers without power when
        the storm snapped trees and power lines. In addition...heavy
        rain produced flash flooding in the Four Mile Canyon burn
        scar. Four debris slides occurred along Four Mile Canyon
        Drive...including one that was 100 yards wide and 4 feet deep.
        Several rockslides were reported in Lefthand and Boulder
        Canyons.  At Denver International Airport...1.04 inches of
        rain was observed.  A peak wind gust of 46 mph from the
        southeast was also observed.
      In 2012...heavy rain produced flash flooding in Boulder County
        near Jamestown. James Canyon Drive was closed after heavy
        rain washed out a section of the roadway. Heavy rain washed
        out a section of Magnolia Road...east-southeast of Nederland.
        Nearby...a trained spotter 4 miles east-northeast of Nederland...
        measured 2.20 inches of rainfall. Flash flooding was also
        reported in the Fourmile burn area along Summerville Road.
        In Dacono...in southern Weld County...the Colorado Department
        of Transportation used snowplows to clear standing water...up
        to 6 inches deep...from a section of Interstate 25. The
        interstate was closed in both directions for nearly two hours.
        South of the Denver...in central Douglas County...flash
        flooding was reported near Perry Park...where 2.5 inches of
        rain fell in one hour.
      In 2014...an Arvada resident was injured by a nearby lightning
        strike while he recorded a video of a thunderstorm with his
        cell phone. He was standing in his garage...when a nearby
        lightning bolt knocked him out. He suffered overall body aches
        and had a ringing sensation in one of his ears. In Denver...
        lightning caused a power outage that affected the RTD light
        rail lines for a short time.  In Castle Pines...lightning
        sparked a small attic fire.  Severe thunderstorms produced
        large hail from 1 to 1 3/4 inches in diameter...along with
        damaging winds across Arapahoe...Boulder and Jefferson
        Counties including:  northwest Arvada...Littleton and
        Louisville. Flash flooding was reported near Evergreen in
        central Jefferson County. Heavy rain...up to 2 inches in one
        hour...flooded several residences and washed out several
        bridges along Forest Estate Road. Heavy rainfall also
        produced street flooding in Denver along with some basement
        flooding.  The strong winds...estimated to 60 mph...downed
        trees and power lines in southwest Littleton. At Denver
        International Airport...0.15 inches of rainfall was observed
        along with a peak wind gust to 42 mph from the southeast.
      In 2020...a thunderstorm produced a peak wind gust to 63 mph
        near Bennett.
7-25  In 1934...a streak of 15 consecutive days of 90 degrees...from the
        7th to the 25th...ranked 5th on the list of hot streaks.  The
        record of 24 consecutive days was established in the summer of
        2008.
8     In 1905...a thunderstorm produced 0.82 inch of rainfall and
        northeast winds sustained to 48 mph.
      In 1977...strong winds turned over 2 light aircraft at Arapahoe
        County Airport...now Centennial Airport.
      In 1987...a weak tornado was observed near Bennett.
      In 1988...three separate tornadoes were sighted near Bennett.
        No damage was reported.  One inch diameter hail was also
        reported.
      In 1991...lightning started three house fires in Castle Rock.
        Damage totaled 13 thousand dollars.  No injuries were
        reported.
      In 1993...a dry thunderstorm microburst wind gust to 55 mph
        briefly reduced the surface visibility to 3 miles at
        Stapleton International Airport.
      In 1997...one construction worker was killed and two others
        injured when a strong thunderstorm wind gust caused the
        scaffolding they were standing on to collapse near Parker.
        A dry microburst produced a wind gust to 54 mph at Denver
        International Airport.
      In 1998...heavy thunderstorm rain forced the closure of
        Hampden Avenue between I-25 and Havana Street in southeast
        Denver.  The high water made 2 or 3 lanes of the street
        impassable.
      In 2001...severe thunderstorms produced large hail...damaging
        winds...and heavy rain across south metro Denver.  Two
        people received minor injuries when a severe thunderstorm
        wind gust to 58 mph blew over several tents at the Cherry
        Creek Arts Festival.  The same storm caused the roof of a
        hardware store in Tamarac Square to collapse.  One employee
        received minor injuries when she was struck in the head by
        falling debris.  The combination of intense rain and wind
        downed trees and power lines.  Electrical power outages
        affected 35 thousand homes and businesses.  At least 50
        trees in city parks across south Denver were damaged.  Up
        to 4.50 inches of thunderstorm rain fell across portions of
        southeast metro Denver.  The underpass at I-25 and Parker
        Road was inundated with 5 feet of water.  Several other
        streets and underpasses in Aurora were also closed due to
        high water.  Heavy rain caused extensive damage to several
        exhibits at the Cherry Creek Arts Festival.  Flash flooding
        occurred when heavy thunderstorm rainfall caused Toll Gate
        Creek to jump its banks.  Several underpasses across south
        Denver had to be closed due to high water.  A man received
        minor injuries when lightning struck a nearby tree at the
        Wellshire Golf Course.  Hail as large as 1 1/4 inches in
        diameter fell in Englewood with 1 inch hail in the City of
        Denver...and 3/4 inch hail in Littleton.  Thunderstorm winds
        gusted to 63 mph at Denver International Airport and to 62
        mph in Englewood.
      In 2005...a tornado touched down briefly near Brighton...but
        caused no damage.
      In 2011...severe thunderstorms produced hail...up to 1 inch
        in diameter...and wind gusts to 60 mph across parts of
        Adams...Broomfield and Denver Counties.  At Denver
        International Airport...a peak wind gust to 59 mph from the
        west.
      In 2017...a strong thunderstorm produced hail up to 7/8 inch
        in diameter in southwest Denver.
      In 2019...a severe thunderstorm produced hail up to 1 inch
        in diameter near Dacono.
9     In 1872...a very brisk wind between 2:00 PM and 3:00 PM
        spread a cloud of dust and sand into the city.
      In 1874...northeast winds at sustained speeds up to 36 mph
        blew immense clouds of dust from the prairie through the
        streets of the city around mid-morning.  The houses
        across the street from the weather station were not
        visible at the peak of the storm.
      In 1875...heavy thunderstorm rains caused stream flooding...
        which damaged nearly all railroads into the city.  Rainfall
        in the city was only 0.14 inch.
      In 1953...heavy thunderstorm rains caused an estimated
        2 million dollars damage from flooded stores and basements
        across metro Denver.  The flood waters reached a depth of
        3 feet on streets in some sections of the city...damaging
        streets and automobiles.  The heavy rainfall at Lowry Air
        Force Base totaled 3.90 inches.  At Stapleton Airport where
        the heavy rain briefly reduced the surface visibility to
        1/2 mile...only 1.05 inches of rain were measured.  North
        winds gusting to 52 mph caused some damage in east Denver.
      In 1982...two small tornadoes were spotted east of Rocky Flats...
        and a tornado touched down briefly 5 miles east of Brighton.
        No damage was reported.
      In 1984...heavy rain fell over southern sections of metro
        Denver.  Rainfall totaled 1.50 inches in just 15 minutes
        between Littleton and Sedalia.
      In 1987...a thunderstorm microburst produced a wind gust of 58
        mph at Erie north of Denver.
      In 1988...hail to 3/4 inch in diameter piled up 2 to 4 inches
        deep in Idaho Springs.  Some basements were flooded and
        several thousand gallons of fuel were contaminated when
        water flooded a gasoline storage tank.  A tornado sighted
        near Manilla 5 miles west of Bennett remained on the
        ground for 9 minutes.  No damage was reported.
      In 1990...a severe thunderstorm produced a tornado and heavy
        rain over northeast metro Denver.  As much as 4 inches of
        rain fell in just 20 minutes in Commerce City...causing the
        South Platte River to rise quickly and flood lowland areas.
        The raging flood waters caused extensive damage to a 30-foot
        stretch of railroad track embankment...destroyed a railroad
        trestle and a nearby garage...and washed away a vintage
        1960`s show car near east 58th Avenue and York Street.  The
        car was found a couple of miles downstream in a pool of deep
        mud and murky water.  Rainfall totaled 1.34 inches at
        Stapleton International Airport where 1/2 inch diameter hail
        fell.  The same thunderstorm produced a brief tornado in a
        vacant field near 64th Avenue and Tower Road just east of
        the Rocky Mountain Arsenal.  No damage was reported from the
        twister.  Lightning from the storm caused power outages to
        as many as 7 thousand homes and businesses.
      In 1996...a tornado (F0) was reported 5 miles south of Hudson.
        No damage was reported.  Twin weak tornadoes (F0) formed
        for a short time near the northeast runways at Denver
        International Airport.  Less than 15 minutes later...a weak
        tornado (F0) touched down in the employee parking lot at
        DIA.  Several car windows were blown out...and a few vehicles
        sustained minor body damage from flying debris.  Several
        signs were also blown down.  Later...twin weak tornadoes (F0)
        touched down again in open country between DIA and Watkins.
      In 2004...severe thunderstorms produced hail to 3/4 inch in
        diameter near Tiny Town and wind gusts to 66 mph in Bennett.
        A thunderstorm wind gust to 56 mph was measured at Denver
        International Airport.
      In 2005...a thunderstorm produced a wind gust to 54 mph at
        Denver International Airport.
      In 2020...severe thunderstorms produced damaging winds and
        large hail over parts of Adams...Arapahoe...and Weld counties.
        The hail generally ranged from 1 to 1 3/4 inches.  The
        largest reports included 2 inch hail in Watkins...with 2 1/2
        inch hail...11 miles east of Arapahoe Park.  Near Brighton
        and Henderson...thunderstorm wind gusts up to 60 mph caused
        minor tree damage.  At Denver International Airport...a peak
        wind gust to 36 mph was observed from the northwest.  In
        addition...0.03 inches of rainfall was reported.
9-10  In 1980...from the 9th to the 10th...a series of severe
        thunderstorms hit metro Denver...dumping heavy rain and
        producing a spectacular lightning display lasting for several
        hours.  A number of homes were damaged by lightning.  Winds
        gusted to 60 mph at Stapleton International Airport where
        about half an inch of rain fell in just 10 minutes along with
        1/4 inch diameter hail.  The evening thunderstorms continued
        into the early morning hours with total rainfall of 1.35
        inches at Stapleton International Airport.
      In 1998...from the 9th to the 10th...thunderstorm rainfall totaled
        2.04 inches at the site of the former Stapleton International
        Airport.
10    In 1878...a lunar rainbow was observed during a light mist and
        fog.
      In 1895...the temperature warmed to a high of only 53 degrees...
        the all-time record lowest maximum temperature for the month
        of July.
      In 1967...golf ball size hail damaged aircraft at Jefferson
        County Airport near Broomfield.
      In 1983...two people were injured when struck by lightning
        just southwest of Morrison.  A man was injured when he was
        swept downstream by a flash flood on a tributary of Clear
        Creek in the canyon 8 miles west of Golden.  Heavy
        thunderstorm rains caused mudslides which closed several
        roads.  Rainfall amounts included:  1.75 inches in 20
        minutes in southeast Denver...1.26 inches in 35 minutes in
        Boulder...2.14 inches in 2 hours in Lakewood...1.70 inches in
        45 minutes in Aurora...and 1.25 inches in 30 minutes atop
        Floyd Hill in the foothills west of Denver.
      In 1992...storm spotters reported 3/4 inch diameter hail
        near the construction site of the new Denver airport just
        northeast of the city.
      In 1995...microburst winds toppled a pine tree 60 feet high
        and 2 feet in diameter in Denver.  The tree fell and
        injured a man nearby.  Microburst winds to 59 mph broke the
        glass on a door at the National Weather Service Forecast
        Office at the site of the former Stapleton International
        Airport.
      In 1998...thunderstorm rainfall totaled 2.35 inches at
        Denver International Airport.
      In 2000...three children were injured...one critically...when
        lightning hit a nearby tree at Panorama Point atop
        Flagstaff Mountain just west of Boulder.  Lightning hit
        the tree...entered the ground...then struck the children.
        Lightning sparked a grassfire that burned about 50 acres
        at the Rocky Flats Environmental Test Facility.  Also...
        lightning sparked at least 6 fires in the Hudson and
        Keenesburg areas as thunderstorms...accompanied with heavy
        rain...large hail...and tornadoes...moved through southern
        Weld County.  Over 2 inches of very heavy rain caused
        flooding along an I-76 exit ramp near Keenesburg.  The
        fire department rescued 15 stranded motorists as high
        water inundated sections of the exit ramp and adjacent
        highway.  Basements were also flooded in Keenesburg.
        One home reportedly had 7 feet of standing water in the
        basement before the rain subsided.  A weak tornado (F0)
        touched down briefly near Brighton...but caused no damage.
      In 2001...a severe thunderstorm dumped 7/8 inch diameter
        hail in Wheat Ridge.
      In 2002...severe thunderstorms pelted the southern suburbs
        of metro Denver with large hail.  Hail as large as
        3 inches in diameter fell 6 miles southeast of Parker.
        Other large hail reports included 2 inch diameter
        hail around Centennial Airport and 3/4 inch hail near
        Sedalia and Deckers.  Hail as large as 3/4 inch was
        also reported in Broomfield.  Runoff from heavy
        thunderstorm rainfall in the Hayman Fire burn area
        flooded Lost Creek Ranch with up to 18 inches of water
        just off State Highway 126.  Floodwaters damaged a very
        expensive rug in the lodge.  A driveway to a residence
        was washed away.  In Douglas County...runoff damaged
        forest access roads in the Turkey Creek drainage.
      In 2011...a severe thunderstorm produced intense
        microburst winds in southeast Boulder County.  A peak
        wind gust to 75 mph was recorded in Superior with
        gust to 58 mph...2 miles south of Lafayette. At Denver
        International Airport...a peak wind gust of 31 mph was
        recorded.
11    In 1872...heavy rainfall started at 4:00 PM and continued
        into the night.  The heavy rainfall damaged homes and
        buildings in all parts of the city.  Rainfall totaled
        1.64 inches.
      In 1888...the temperature reached 100 degrees in downtown
        Denver.
      In 1954...the high temperature climbed to 102 degrees at
        Stapleton Airport.
      In 1970...a girl walking in a park in southeast Denver
        received eye and facial injuries when lightning struck
        nearby.  Lightning also caused numerous power outages
        and heavy rainfall produced local flooding at several
        locations across metro Denver.
      In 1974...large hail up to 1 1/2 inches in diameter fell in
        Thornton.
      In 1990...the worst hailstorm in American history in terms of
        dollar damage at the time battered metro Denver.  Storm
        damage totaled 605 million dollars...as it cut a 5-to 10-mile
        wide swath from just southeast of Estes Park to northeast of
        Colorado Springs.  Hail as large as baseballs (2 3/4 inches)
        pounded metro Denver.  Hardest hit areas were southeast
        Boulder County...the Jefferson County Airport in Broomfield...
        Arvada...east Wheat Ridge...southwest and south-central
        Westminster...west Thornton...northwest...west-central and
        downtown Denver...northeast and east-central Lakewood...just
        east of Littleton...portions of Arapahoe County west of I-25...
        and northern and central Douglas County near Castle Rock
        and Franktown.  Golf ball to baseball size hail severely
        damaged roofs on thousands of homes and buildings...battered
        tens of thousands of automobiles...windows...signs...street
        lights...and traffic signals...stripped paint...awnings...and
        trim from buildings...punched holes in the roofs of two homes
        in Arvada...knocked out power and telephone service to
        thousands of homes and businesses...defoliated thousands of
        trees...ripped up greens and fairways on a number of golf
        courses...and severely damaged several aircraft tied down at
        Jefferson County Airport.  Hail the size of baseballs fell
        for several minutes in Old Town Arvada.  Later...golf ball
        size hail and heavy rain pummeled two northwest Denver
        amusement parks.  Hardest hit was Elitch Gardens Amusement
        Park where 47 people were injured and received treatment
        for bumps...cuts...and bruises at local hospitals.  Many of the
        injured were stranded on rides during the storm when power
        failed.  Hail clogged storm sewers...causing rain water to
        back up 3 to 6 feet deep on some roads and intersections in
        Arvada.  Several basements were flooded.  In some places
        hail was washed into drifts several feet deep.  In addition...
        the storm spawned 2 small tornadoes.  One touched down
        briefly in Lakewood near 6th Avenue and Kipling Blvd....but
        did no damage.  In Castle Rock...a tornado (F1) did heavy
        damage to some homes and vehicles in the Founders Village
        development near Ridge Road.
      In 2001...lightning struck two homes in Thornton.  Most of the
        damage was confined to the attics of both homes.  Hail as
        large as 3/4 inch in diameter fell in Keenesburg...Longmont...
        and near Boulder.
      In 2015...a peak wind gust to 55 mph was measured from the
        northwest at Denver International Airport.  A trace of
        rainfall was also observed.
11-12 In 1872...heavy rain...from 4:00 PM on the 11th until 2:00 AM
        on the 12th...caused much damage.  Rainfall totaled 1.76
        inches.
12    In 1881...during the early evening...a brisk rain fell for
        30 minutes from a nearly clear sky containing not one
        tenth of clouds with the sun shining brightly.  Rainfall
        was 0.16 inch.
      In 1885...thunderstorms produced widespread lightning across
        the city during the evening.  Several people were injured
        when their homes were struck by lightning.
      In 1954...the high temperature reached 101 degrees at Stapleton
        Airport.
      In 1962...lightning struck and killed a Denver man...while he
        was assisting a co-worker with his car.
      In 1971...the temperature climbed to a high of 101 degrees at
        Stapleton International Airport.
      In 1974...hail to 3/4 inch in diameter fell in Castle Rock.
      In 1991...hail to 2 inches in diameter fell in Thornton with
        golf ball size hail in Brighton.  Dime size hail was
        recorded in the City of Denver.  Very heavy rain caused
        flooding across metro Denver.  Water was up to 2 feet deep
        in parts of Golden where one foot of water was reported in
        the lot of a mobile home park.  Flood water washed away part
        of a parking lot at the Colorado School of Mines in Golden.
        Heavy rain caused a rock slide and flooding along I-70 in
        the foothills just west of Denver.  Flood waters were a foot
        deep at the intersection of I-70 and I-25 just north of
        downtown Denver.  A funnel cloud was sighted just east of
        the Rocky Mountain Arsenal.
      In 1996...very heavy rainfall from a fast moving thunderstorm
        dumped 2 to 3 inches of rain within an hour over southern
        Jefferson County.  Two people were killed near the town
        of Buffalo Creek when a 20-foot wall of water flooded
        the area.  Utility poles and trees were uprooted; cars...
        propane tanks...and bridges were destroyed in the flood`s
        path.  Entire buildings were moved from their foundations
        and heavily damaged by the floodwaters.  The first fatality
        occurred along State Highway 126 when the driver of a
        pick-up truck was washed off the road by the deadly wall of
        water.  The second death occurred farther upstream when a
        man in a 5th-wheel trailer was washed away.  This was the
        second disaster to strike the area in the last couple of
        months.  The community was already recovering from a
        wildfire which burned about 12 thousand acres of forest land
        in late May.  With the forest burned by fire...very little
        vegetation was available to slow the storm`s runoff...which
        resulted in the flash flood.  Power...water...and sewer
        service were heavily damaged in the flood and...in some
        cases...beyond repair.  The cost of repairing the roads and
        water system in the area was estimated at around a half
        million dollars.  Elsewhere across metro Denver...severe
        thunderstorms produced hail...damaging winds...and small
        tornadoes.  Weak tornadoes (F0) were reported in Broomfield...
        3 miles east of Englewood...and in Dacono.  No damage was
        reported...except a trampoline was blown into a window and
        several trees were downed in Broomfield.  Thunderstorm
        wind gusts estimated as high as 60 mph blew a fence down
        in Louisville where winds also toppled a tree near a house.
        The house received only minor damage.  Large hail...strong
        winds and heavy rain caused substantial property damage
        in portions of southeastern Boulder and northern Jefferson
        counties.  Damage estimates in the Broomfield area alone
        were about 1 million dollars.  Winds gusted to 81 mph in
        Broomfield.  Large hail...3/4 to 1 1/2 inches in diameter
        fell in Evergreen...Lakewood...Englewood...Broomfield...near
        Morrison...northeast of Boulder...and just east of Denver
        International Airport.
      In 2000...heavy rain fell across a portion of the Hi Meadow
        Fire burn area near Buffalo Creek...causing localized
        flooding.  About 3/4 inch of rain fell in 30 minutes over
        Miller Gulch.  Some culverts become plugged by debris from
        the fire.  As a result...small sections of a U.S. Forest
        Service road along Miller Creek were washed out.  Lightning
        struck a home in Castle Rock...causing extensive damage to
        the roof...attic...and second floor.
      In 2011...severe thunderstorms developed over parts of Adams
        and Denver Counties. At Denver International Airport...a
        severe thunderstorm produced a peak wind gust to 66 mph...
        with another gust to 59 mph measured in Denver.  In
        Commerce City...the intense winds blew down a large tree.

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