Public Information Statement
Issued by NWS Denver/Boulder, CO

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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT WED JUN 7 2017

...Today in metro Denver weather history...

1-30  In 2012...it was the hottest June in Denver since weather
        records began back in 1872. The average temperature for
        the month was 75.0 degrees which was 7.6 degrees above
        normal.  There were a total of seventeen 90 degree days in
        the month of June. The highlight of record setting month
        was a stretch of five consecutive 100 degree days from the
        22nd to the 26th. This was only the third time in Denver
        weather history in which this happened. Two of the high
        temperatures during the stretch peaked at 105 degrees...
        which set the all time record for the month of June and
        tied the all time maximum temperature for Denver.
2-7   In 1921...heavy rainfall for nearly a week...on top of streams
        already swollen by mountain snowmelt...produced widespread
        flooding over the South Platte River basin...including the
        tributaries through the canyons to the west and southwest
        of Denver.  Heavy rainfall over the 6-day period totaled
        3.36 inches in Boulder...4.98 inches in Morrison...4.27 inches
        in Castle Rock...and 2.94 inches in the City of Denver.
        Rainfall amounts in the foothills were estimated between
        3 and 6 inches.  The narrow-gage tracks of the Colorado and
        Southern Railroad were destroyed in the Platte canyon.  From
        the mouth of the canyon through the city to near Brighton...
        the river spread from 1/2 to nearly 1 1/2 miles wide...
        flooding farm and pasture land and destroying or damaging
        many bridges.  In the city...many businesses along with as
        many as 500 homes were inundated...forcing their evacuation.
        Bridges were swept away.  The high waters flooded the rail
        yards and stock yards in lower downtown...closing three
        adjacent packing houses.  The heavy rains also caused
        flooding on Boulder Creek in Boulder on the 6th.
6-7   In 2004...a brief hot spell produced 3 temperature records.
        High temperatures of 95 degrees on the 6th and 98 degrees
        on the 7th were record maximum temperatures for the dates.
        Low temperature of 68 degrees on the 7th was a record high
        minimum for the date.
      In 2007...an unusually strong storm system brought very strong
        winds to the Front Range Foothills and Urban Corridor.
        Peak gusts included:  92 mph at Boulder...85 mph...2 miles
        southwest of Boulder...83 mph...10 miles south of Boulder and
        55 mph at Denver International Airport.  High winds forced
        the closure of Mt. Evans Road and Trail Ridge Road.  Several
        trees were uprooted across the Urban Corridor.  In Aurora...
        the driver of a car was injured when some building material
        blew off the Fitzsimmons Complex.  The debris landed on the
        car and knocked the driver unconcious.  The wind forced the
        cancellation of 60 flights at Denver International Airport.
        Xcel reported outages in Boulder...Denver...Lakewood and
        Longmont.
      In 2012...severe thunderstorms broke late in the evening...
        striking areas hardest from Denver southward. Locations
        impacted by the storms included but were not limited to:
        Aurora...Castle Rock...Centennial...Highlands Ranch...Lone Tree...
        Parker and Surrey Ridge. The storms produced a barrage of
        large hail...damaging straight line winds...flash flooding
        and several short lived tornadoes. The hail ranged in size
        from 1 to 2 inches in diameter...and caused extensive damage
        to homes and automobiles. The hail inundated the roadways
        with several inches of hail in Douglas County. Consequently...
        snow plows had to be called out to clear the roadways.
        The combination of torrential hail and heavy rain produced
        flash flooding in parts of Elbert...Douglas and Arapahoe
        Counties...as thunderstorms brought up to 3.35 inches of rain
        to some areas within 90 minutes. In Aurora...Picadilly Road
        was closed from flooding north of 6th Avenue. A water rescue
        took place on South Gun Club Road in Arapahoe County...where
        floodwaters were rushing to depth of 3 feet. Flash flooding
        forced the closure of several streets and roads from Parker
        south to The Pinery...where the floodwaters inundated the
        roadway with up to 2 feet in several locations.  At
        Centennial Airport...a historic B-17 Flying Fortress suffered
        extensive damage as hailstones as large as ping pong balls
        struck the aircraft. Although the airframe itself did not
        require repair...the fabric-covered ailerons and elevators
        were extensively damaged. The hail came straight down and
        punched holes in the fabric-covered control surfaces. The
        aircraft landed just hours before the storm hit to
        participate in a weekend tour stop.  Lightning also struck
        two homes...one in Lakewood and the other in Parker.
        Straight line winds downed trees and power lines in Aurora.
        As a result...scattered electrical outages affected around
        five thousand residents.  At Denver International Airport...
        0.61 inches rainfall was recorded along with a peak wind
        gust of 41 mph.
7     In 1904...a thunderstorm produced south winds to 40 mph with
        gusts to 50 mph...but only a trace of rain.
      In 1942...heavy thunderstorm rainfall in south Denver caused
        flooding of shops...stalled motorists...and halted tramway
        service temporarily.  Lightning damaged houses...but there
        was no loss of life.  Precipitation totaled 0.53 inch in
        downtown Denver.
      In 1951...a 24x65 foot roof of a cow barn was lifted off the
        building and blown to the ground by a "twister" near Fort
        Lupton.
      In 1961...small hail and heavy rain damaged property and crops
        in southwest metro Denver...including the southwest section
        of the city...Lakewood...and Littleton.  Precipitation totaled
        1.20 inch...11 miles southwest of Stapleton Airport.
        Complete primary and secondary rainbows were sighted by
        National Weather Service observers at Stapleton Airport.
      In 1968...severe thunderstorms moving to the northeast
        through sections of Denver caused local flooding of streets
        and damage to trees and gardens from hail 1/2 to 1 3/4
        inches in diameter.  One man was killed and 2 were injured
        at the Wellshire golf course when lightning struck a tree
        under which they had taken shelter.  At another golf course...
        a man was mortally injured by lightning.  Marble to golf
        ball size hail fell over downtown Denver.  Hail to 3/4 inch
        in diameter was measured in Westminster.
      In 1975...hail up to 3/4 inch diameter fell in Boulder.
      In 1978...a man standing under a tree on a golf course in
        Denver was struck in the arm by lightning.   Wind gusts to
        60 mph and golf ball size hail pelted west and south
        Denver.
      In 1986...7/8 inch hail was measured in Lafayette.
      In 1990...a thin...rope-shaped tornado touched down east of the
        intersection of State Highway 2 and 96th Avenue just north
        of the Rocky Mountain Arsenal.  No damage was reported.
      In 1992...a thunderstorm wind gust to 60 mph was recorded in
        Boulder.  A funnel cloud was sighted by a Highway Patrol
        Officer just northwest of Stapleton International Airport
        where thunderstorm winds gusted to 51 mph.  Spotters and
        State Patrol Officers reported funnel clouds in the
        northwestern part of metro Denver...near Golden...and 7 miles
        northwest of Stapleton International Airport.
      In 1993...non-convective high winds pummeled the Front Range
        foothills during the late morning and afternoon.  Speeds of
        60 to 80 mph were common.  The winds caused several power
        outages as well as uprooting trees.  In Lafayette...a 4-year-
        old boy was slightly injured while standing on the roots of
        a large tree which was toppled by the winds.  The boy fell
        10 feet to the ground and was bruised and scraped.  A tree
        fell onto a parked car in Boulder...causing about 35 hundred
        dollars in damage.  West wind gusts to 41 mph were recorded
        at Stapleton International Airport where a thunderstorm
        produced 1/8 inch hail at daybreak.
      In 1995...severe thunderstorms produced large hail across
        west and north metro Denver from Golden to Westminster
        and Fort Lupton.  Hail ranged in size from 3/4 to 2 inches
        in diameter.  The largest hail fell in Fort Lupton.  A weak
        tornado produced a brief dust and debris cloud in a corn
        field 3 miles northeast of Hudson.
      In 1997...two plumbers were injured...one critically...when
        lightning struck a pipe on which they were working in
        an apartment building under construction in Denver.  The
        bolt apparently hit one man in the hand...passed through
        his chest...and struck the other worker.  The critically
        injured man...died a few days later.  Lightning also
        injured a man...while he was talking on a telephone in
        Ward.  The bolt passed through the phone line burning
        his ear.
      In 2001...hail as large as 7/8 inch in diameter fell in
        Westminster.
      In 2009...severe thunderstorms in Denver and the
        surrounding metropolitan area produced five tornadoes...
        large hail...up to 3 inches in diameter...and damaging
        thunderstorm winds.  The tornado that produced the most
        significant damage touched down in southeast Aurora...
        south of Buckley Airport; it moved south-southeast
        across open fields...some residential areas and damaged
        Southlands Mall.  It was 100 yards wide with a storm
        track of approximately 5 1/2 miles.  Southlands Mall had
        some roof and window damage...as well as wall damage to
        one of its resturants.  South of the mall...Lowe`s
        received some roof damage; lightweight sheds and other
        structures were also destroyed.  Numerous homes and
        apartments suffered window damage...minor roof damage and
        there were a few broken garage doors. One resident...north
        of the mall...was injured when he was swept off his porch
        while attempting to photograph the tornado.  He was found
        unconcious and bleeding in his front yard...with a
        dislocated shoulder...an injured neck...and numerous other
        injuries.  In addition...the tornado flipped a trailer home.
        A man inside the trailer suffered minor injuries.  In parts
        of Aurora and Centenniel...thunderstorm winds blew down
        power lines and caused electrical outages.  Approximately
        8000 homes and businesses were without power for nearly
        two hours.  Earlier in the day...a tornado touched down
        about 6 miles northwest of Northglenn and caused minor
        damage.  It`s path covered approximately 1/2 mile.
        Several trees were downed in an open field.  The tornado
        also damaged a metal fence and caused minor roof damage
        to a nearby residence.  The third tornado touched down 7
        miles east-northeast of Buckley Air Field and flipped a
        semi-trailer as it passed over Interstate 70.  Lastly...
        two tornadoes touched down in northwest Elbert
        County.  One tornado damaged several outbuildings...a
        residence...and downed several trees.  In addition...
        several horses were injured by flying metal debris.
        The other tornado touched down in open country. This
        day was the first in the series of eight to cause
        damage along the Urban Corridor.  Damage to homes and
        property along the Front Range totaled $161 million
        during the 8-day span.  The majority of the property
        damage was caused by hail; 21000 automobile claims
        and 13000 homeowner claims were filed.
      In 2012...severe thunderstorms brought damaging wind and
        hail...heavy rain and flash flooding.  The storms
        produced hail from 1.5 to 2.5 inches in diameter. In
        addition to the large hail...heavy rain from 1 to 2
        inches also accompanied the storms. The combination of
        hail and heavy rain caused extensive street flooding
        across Aurora...Castle Rock...Centennial...Cherry Creek...
        Englewood...South Denver...Highlands Ranch...Lakewood and
        Littleton. The hail was reportedly "knee deep" in
        several areas making roads impassable. As a result...
        snow plows had to be summoned to clear the streets. In
        Castle Rock...a King Soopers supermarket sustained
        extensive damage when roof partially collapsed under
        the weight of the hail. At Denver International
        Airport...0.61 inches of rainfall was again recorded
        along with a peak wind gust of 40 mph.  Total property
        damage estimates along the Front Range for the 6th and
        7th combined was 321.1 million dollars.
7-9   In 1979...rain...at times with thunder on the 7th...fell almost
        continuously through the morning of the 9th.  Rainfall
        totaled 2.28 inches at Stapleton International Airport
        over the 3 days.  High temperature of only 49 degrees on
        the 8th was a record low maximum for the date.

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