Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 130045

Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT AUG 12 2017

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

8-13  In 1875...clouds of grasshoppers were seen flying through
        the air on the prevailing winds during each day.
12-13 In 1975...heavy rains caused flash flooding along the
        foothills from Denver north.  Thunderstorm rainfall
        totaled 1.56 inches at Stapleton International Airport.
      In 2004...a brief cool spell resulted in two daily
        temperature records.  The low temperature of 49
        degrees was a record minimum for the was
        the low temperature of 48 degrees on the 13th.
13    In 1959...thunderstorm winds gusted to 53 mph at Stapleton
      In 1983...thunderstorms dumped torrential rain in Northglenn...
        Thornton...and Broomfield.  Northglenn was drenched with
        1.72 inches in 30 minutes.  Street flooding was widespread. large as 3/4 inch in diameter...was reported
        7 miles northeast of Boulder along with heavy rain which
        caused some street flooding.
      In 2000...lightning sparked 3 small grass fires near Golden.
        The fires were quickly contained.  Hail as large as 3/4
        inch in diameter fell in Castle Rock.
14    In 1960...a bolt of lightning struck a man in Henderson...
        causing serious burns.
      In 1962...the temperature climbed to a high of 100 degrees
        at Stapleton Airport.
      In 1968...a young man on a golf course in Denver was injured
        when lightning struck a tree under which he was standing.
        Lightning caused minor damage to a house in Denver.  Heavy
        thunderstorm rain caused local street flooding.  One inch
        diameter hail fell at Jefferson County Airport near
      In 1973...winds as high as 85 mph damaged 20 aircraft at the
        Arapahoe County Centennial Airport.
      In 1977...three tornadoes were sighted in Bennett.  A man
        suffered a broken leg when hit by a flying board.  He was
        outside his camper home...which was destroyed.  All windows
        were broken in a near-by farmhouse where some shingles were
        ripped off and a 2 car garage was knocked down.  Several
        vehicles were damaged and a cat...some rabbits...and chickens
        were killed.  A broken oar from a boat was driven into the
        side of a house.  A mobile home was overturned.  One old
        barn was destroyed.  Half a dozen homes and several
        agricultural buildings were damaged just west of State
        Highway 79.
      In 1978...high winds produced much blowing dust...causing many
        traffic accidents in the Denver-Boulder area.  Winds gusts
        of 70 to 101 mph were recorded.  Northwest winds gusted to
        44 mph at Stapleton International Airport.
      In 1980...lightning hit two power poles in Littleton...causing
        400 dollars in damage.  Rainfall of 1.23 inches in a short
        time caused minor flooding...which included damage to a
        ground floor apartment and partially submerging a few
        vehicles in water.  Thunderstorm rainfall totaled 0.98 inch
        at Stapleton International Airport.
      In 1983...2.10 inches of rain drenched Golden in an hour with
        similar amounts in Lakewood and Boulder.  Over ten thousand
        dollars worth of plants were washed away at a nursery in
      In 1997...twelve motorists were injured in a multi-car
        accident when strong microburst winds estimated to 50 mph
        blew blinding dust across I-70 near Bennett.
      In 1998...lightning struck a hydro-electric plant in Nederland...
        causing a power outage.  Residents in the foothills west
        of Boulder...including Nederland...Ward...Eldora...Jamestown...
        and Gold Hill...were without power for about an hour.
      In 2006...heavy thunderstorm rainfall near Deckers washed
        away some the banks along State Highway 67 between Deckers
        and Westcreek.  Several driveways on both sides of the
        highway were also damaged.
15    In 1899...a thunderstorm produced southwest sustained winds
        to 43 mph with gusts to 46 mph.
      In 1972...a pilot reported a funnel cloud briefly touching
        the ground in open fields...17 miles east-northeast of
        Stapleton International Airport.
      In 1980...thunderstorm winds gusted to 55 mph in Boulder.
      In 1982...brief heavy rain and winds estimated as high as 70
        mph occurred in the Conifer-Evergreen area.  No damage was
      In 1990...lightning triggered a small attic fire in a house
        near Sedalia...20 miles south of Denver.  A furious
        lightning storm caused widespread power outages across
        southern sections of metro Denver.  One lightning bolt
        knocked out an electrical substation...causing a 90-minute
        blackout in southeast Denver affecting nearly 10 thousand
        homes and businesses.
      In 2007...severe thunderstorms produced large hail...up to 2
        inches in diameter...near Larkspur.   Extensive damage to
        vehicles in the area was reported.  In Parker...lightning
        struck a residence.  The ensuing fire damaged the attic
        and top floor; causing $100000 in property damage.
      In least three homes were hit by lightning during
        the early morning hours in Arapahoe County.  Lightning
        also struck two homes in Castle Rock...damaging the roofs.
      In 2013...a dry microburst uprooted 30 to 40 large trees
        across a 12-block area of the Park Hill neighborhood in
        east central Denver. Several trees were snapped near the
        base along with numerous branches...8 to 10 inches in
        diameter. Power poles and lines were also downed with
        resulted in outages which affected seven hundred
        residents. One of the downed trees crushed a car`s hood...
        narrowly missing the driver. At Denver International
        Airport...a peak wind gust of 22 mph was observed from the
16    In 1902...a thunderstorm produced west winds sustained to
        48 mph with gusts to 60 mph...but only a trace of rain.
      In 1952...a thunderstorm wind gust to 50 mph was recorded at
        Stapleton Airport.
      In 1960...lightning struck a warehouse in central Denver...
        causing 8 thousand dollars in damage to the building and
        stored electrical equipment.
      In 1975...large hail...1 1/2 to 1 3/4 inches in diameter...fell
        about 4 miles north of Castle Rock.  Hail caused some minor
        damage in Aurora.  A funnel cloud was reported 25 miles
        east of Denver near Bennett.
      In 1981...a tornado touched down briefly in open country just
        to the east of Aurora.  No damage was reported.
      In 1982...a thunderstorm wind gust to 61 mph was recorded at
        Buckley Field in Aurora.  At the same time almost an inch
        of rain flooded and closed streets in south Aurora.  A
        women was hit by lightning just north of Denver.  A house
        in the area was also struck.
      In 1985...a thunderstorm produced strong wind gusts over
        southern metro Denver.  One strong wind gust hit Cherry
        Creek Reservoir...capsizing a boat and drowning a man.  The
        wind gusts...clocked as high as 50 mph...also downed a few
      In 1989...1 3/4 inch diameter hail fell at Intercanyon in
        the foothills of Jefferson County.
      In 1990...lightning caused minor damage to a south Aurora
        home.  No injuries were reported.
      In 1994...strong thunderstorm winds caused damage in southern
        Weld County near Hudson and Fort Lupton.  Two mobile homes
        were destroyed and a few lost their roofs.  Up to 20 downed
        power poles and the destruction of two 115 thousand-volt
        towers caused widespread power outages.  Thunderstorm gust
        front winds from the north gusted to 48 mph at Stapleton
        International Airport.
      In 2000...lightning ripped most of the roof from a home in
        southeast Aurora.  The bolt sparked a fire which destroyed
        the residence.  Damage was estimated at 250 thousand
      In 2002...the temperature climbed to a maximum of 100 degrees
        setting a new record high for the date.
      In 2003...a teenager was injured when he was struck by
        lightning while camping at Herman Lake...13 miles northwest
        of Georgetown.  The boy was knocked unconscious and suffered
        minor injuries.
16-19 In 1979...heavy thunderstorm rains on each of 4 consecutive
        days dumped a total of 2.62 inches of rain on Stapleton
        International Airport.  The heaviest rain...1.05 inches...
        on the 19th was accompanied by 1/4 inch diameter hail.
17    In 1953...a tornado was sighted 8 miles east of Castle Rock.
        An unconfirmed tornado was sighted between Denver and
        Strasburg.  No damage was reported.
      In 1963...heavy rain in southeast Denver...Englewood...and
        Littleton caused flooding of basements and streets.  Over
        3.00 inches of rain fell at Cherry Creek Dam.  Lightning
        caused power failures.  The hardest hit areas were in north-
        central Denver.  A 12-year-old boy was swept into a conduit
        by a 3-foot high crest of water.  He was carried 125 feet
        through the waterway...but was unhurt.  Thunderstorm
        rainfall totaled only 0.24 inch at Stapleton Airport.
      In 1972...a thunderstorm wind gust to 53 mph was recorded at
        Stapleton International Airport.  Strong winds also occurred
        in the Littleton area where several trees and utility poles
        were blown over and a number of windows broken.
      In 1978...1 3/4 inch diameter hail was reported in Thornton.
      In 1982...heavy rain occurred in the foothills southwest of
        Denver where 4.50 inches fell in 75 minutes between
        Evergreen and Conifer.  Nearby...2.66 inches of rain
        drenched the North Turkey Creek Canyon area in just 15
      In 1984...scattered slow moving thunderstorms dumped heavy
        rain across southern metro Denver.  The heavy rain caused
        some road washouts in Jefferson and Douglas counties.  A
        bridge was washed out in Douglas County.  Three inches of
        rain fell in just an hour at Castle Rock...causing heavy
        silt damage to a home and to nearby drainage ditches.
      In 1988...a thunderstorm dumped 2 to 3 inches of rain in
        southeast Denver and adjacent areas of Arapahoe County
        in less than 90 minutes.  There was widespread street
        flooding...and I-25 was closed by 4 feet of water near its
        intersection with I-225 just south of Denver.  A flood
        control project in Arapahoe County at Greenwood Village
        sustained over 10 thousand dollars damage.  Up to 4 feet
        of water flooded some basements in the area.  Only 0.44
        inch of rain fell at Stapleton International Airport.
      In 1990...heavy thunderstorm rains over the Boulder Creek
        and St. Vrain Creek drainage basins caused many creeks and
        drainage ditches to rise in eastern Boulder and southwest
        Weld counties.  The high waters punched three 30-foot holes
        in the embankment of a drainage ditch...which traversed
        through the town of Firestone...20 miles north of Denver.
        A sheet of water 2 to 3 feet deep rushed out onto the
        streets of Firestone...forcing the evacuation of a trailer
        park and residents from 50 neighboring homes.  No injuries
        or serious damage occurred except for mud and water damage.
        Lightning struck and injured 4 construction workers
        standing in an Aurora field.  They received treatment for
        minor injuries at a local hospital.  Lightning also
        struck the roof of a Methodist Church in central Denver...
        knocking down the highest peak of the steeple.  A half
        dozen people were in the building...but no one was injured.
        Slow moving thunderstorms dumped 2 to 3 inches of rain over
        southeast Aurora in 90 minutes.  The heavy rain accumulated
        on the roof of a condominium clubhouse...causing the roof to
        collapse under the weight of the water.  Nearly 300
        residents were evacuated from the 200-unit complex because
        of the structural damage.  The residents were allowed to
        return to their homes when it was determined the damage was
        confined to the clubhouse.  No injuries were reported.
      In 1993...just west of Fort Lupton...thunderstorm winds blew
        the tin roof off a cattle shelter into a mobile home...
        causing considerable damage to the mobile home.
      In 1997...lightning struck a home in Castle Rock sparking a
        fire.  Damage was estimated at 20 thousand dollars.
      In 2000...thunderstorms producing very heavy rain...up to 3.50
        inches in spots...caused flooding and flash flooding across
        metro Denver.  In Commerce City...a 37-year-old firefighter
        drowned while attempting to rescue a stranded motorist on
        a flooded street.  The firefighter was wading through the
        water when he lost his footing and was sucked into a 10
        foot deep culvert.  He was swept away before anyone could
        reach him.  Extensive flooding was also reported throughout
        Littleton and north Denver.
18    In 1965...heavy rain in areas south and east of Denver caused
        some flooding in Littleton and Englewood.  Clear Creek was
        running near bankfull...and heavy rain in southwest Denver
        flooded intersections.
      In 1966...a brief very heavy thunderstorm dumped 0.61 inch of
        rain in just 5 minutes at Stapleton International Airport.
        Total rainfall from the storm...0.64 inch...fell in just 10
        minutes.  Half inch diameter hail also fell at Stapleton
        International Airport.  The public sighted funnel clouds 10
        to 15 miles south of the airport.
      In 1967...hail struck in a strip along the eastern foothills
        and caused minor damage in Boulder.  Hail accumulated to a
        depth of 4 to 6 inches in Jefferson County just southwest
        of Denver.
      In inch to hen egg size hail was reported in
        Broomfield with golf ball size hail at Northglenn.
      In 1990...dime size hail and thunderstorm wind gusts to 50 mph
        were reported by storm spotters just east of Aurora near
        the intersection of Mississippi Avenue and Gun Club Road.
        The hail and strong winds damaged a number of windows in
        the area.
      In 1991...very heavy rain from slow moving thunderstorms
        dumped up to 3 inches of rain in 20 minutes in the vicinity
        of Idaho Springs and Central City.  Flooding in Idaho
        Springs forced the closure of the Virginia Gulch Road...which
        runs from Idaho Springs to Central City.  Dirt roads above
        Central City were damaged or destroyed with the mud being
        swept onto streets in town.  High water in Clear Creek...up
        to 3 feet above flood stage...washed out a bridge in Idaho
        Springs.  Rock and mud slides forced the closure of I-70
        about 1 mile east of Idaho Springs.
      In 1997...dry microbursts produced two peak wind gusts to
        an estimated 60 mph east of Buckley Field.
      In 2000...hail as large as 3/4 inch in diameter was measured
        5 miles west of Sedalia.
      In 2003...a severe thunderstorm produced hail as large as
        2.75 inches in diameter at Highlands Ranch.  Hail to 3/4
        inch was reported in Aurora near Cherry Creek and in
        Arapahoe County 9 miles southeast of Aurora.
      In 2004...heavy thunderstorm rainfall caused flash flooding
        across central and southern metro Denver.  A rain gage at
        City Park recorded 4.37 inches of rainfall from the deluge.
        Several roads in and around the city had to be closed due
        to floodwaters...stranding many vehicles.  The Denver Fire
        Department conducted at least 15 water rescues.  One driver
        nearly drowned when he made a wrong turn into a retaining
        pond.  Four men who witnessed the accident were able to save
        the man before his car was completely submerged.  Widespread
        street flooding was reported in the Denver Stapleton area
        where rainfall totaled 3.81 inches.  Standing water over
        6 inches deep was reported near I-70 and Quebec...I-225 south
        of I-70...and I-25 near 6th Avenue.  Flood waters reached
        8 feet deep in some low lying areas as sewers became clogged
        and the storm runoff pipes were unable to handle the heavy
        flow of water.  Heavy rainfall caused additional flash
        flooding south of Denver.  Several street intersections in
        Centennial and southern Aurora became impassable due to high
        water.  Two feet of water covered portions of the roadway near
        Park Meadows Mall.  One person had to be rescued near the
        intersection of Arapahoe Road and Liverpool.  Floodwaters
        forced the closure of Stonegate Parkway near Jordan Road and
        Lincoln Avenue.  Flooding was also reported on Meridian Blvd.
        near I-25.  Rainfall was 1.62 inches at Denver International
18-19 In 1875...nearly 0.75 inch of rainfall in the city overnight...
        possibly assisted by heavier rainfall upstream...produced a
        decided and rapid rise in Cherry Creek...which washed out
        some bridges.  Other small creeks and streams were filled
        to overflowing.
19    In 1983...heavy rain fell across the northern metro Denver
        suburbs with 1.50 to 1.80 inches of rain in Broomfield...
        Arvada...and Thornton.
      In 1989...lightning killed a 31-year-old man and injured his
        10 year old nephew when it hit a tree they were walking
        under in the foothills about 5 miles west of Boulder.  The
        boy received mouth to mouth resuscitation on the scene and
        recovered after being hospitalized overnight.  Three other
        people were knocked to the ground by the bolt...but were
      In 1990...3/4 inch diameter hail was reported in Wheat Ridge.
        A thunderstorm over west Denver dumped an inch of rain in
        20 minutes...causing minor street flooding.  One inch
        diameter hail was reported over east Denver.  Ping pong to
        golf ball size hail was reported 14 miles northeast of
        Denver at the intersection of 122nd Ave. and Brighton Blvd.
        The hail stones knocked out windows and did an unspecified
        amount of damage to the roof of a house.  Close by...heavy
        thunderstorm rains caused gullies...irrigation ditches...and
        small streams to overflow their banks near the intersection
        of 120th Avenue and Riverdale Road.  Flood waters 1 to 2
        feet deep covered the river bottom land along the South
        Platte River. structures were threatened by
        the flood waters.
      In 1999...heavy rain...up to 5 inches in two hours...caused
        East Tollgate Creek to jump its banks.  The bike path
        adjacent to the creek was underwater at several locations.
        Several underpasses were also flooded...halting traffic.
        In unfinished playground at a local elementary
        school was completely flooded.  Lightning struck a vehicle
        at East Evans Avenue and Tower Road.  The woman inside the
        vehicle was not injured.
19-30 In 1875...grasshoppers appeared in great numbers at 10:00 AM
        on the 19th.  Thousands landed on the ground.  The streets
        were literally covered with them.  Swarms of grasshoppers
        were seen on each day.  All gardens in the city were
        devastated...and in the countryside the grasshoppers were
        very destructive to ripened grain.  On the 30th the
        grasshoppers were so numerous as to almost darken the sun.

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