Public Information Statement
Issued by NWS Denver/Boulder, CO

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COZ030>051-062300-

Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT TUE JUN 6 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.
5-6   In 1977...lightning caused several power outages and moderate
        damage to a railroad building.
6     In 1954...thunderstorm winds at speeds of 50 mph with gusts as
        high as 59 mph briefly reduced the visibility to 1 mile in
        blowing dust at Stapleton Airport.
      In 1967...the public reported golf ball to 1 3/4 inch diameter
        hail in the city...3 miles west-southwest of Stapleton
        International Airport.  The amount of damage was unknown.
        Thunderstorm winds gusted to 46 mph at Stapleton
        International Airport.
      In 1981...hail to 3/4 inch in diameter was reported in east
        Denver.
      In 1990...golf ball size hail was reported near Strasburg on
        I-70 east of Denver.
      In 1991...a tornado was spotted by National Weather Service
        personnel and weather spotters...14 to 17 miles northeast of
        Stapleton International Airport.  A funnel cloud was sighted
        over south Aurora just east of Buckley Field...and a tornado
        was spotted just east of Watkins.  No damage was reported.
        Thunderstorms moved through Aurora and dropped hail up to
        1 inch in diameter.  The storms also produced heavy rain...
        up to 1 inch in 30 minutes...causing flooding of streets.
        Water was reported hood deep...stranding motorists.  Water
        covered fire hydrants at some intersections.
      In 1995...a waterspout sighted over Standley Lake in northern
        Jefferson County...quickly dissipated once it reached shore.
        A brief tornado...which was momentarily visible by a dust
        debris cloud on the ground...damaged the roof of a house in
        Westminster.  A funnel cloud was sighted just south of
        Lafayette.  Hail from 3/4 to 1 1/4 inches in diameter fell
        over north Boulder.  Thunderstorm outflow produced north
        wind gusts to 44 mph at Denver International Airport.
      In 1997...a tornado touched down near Baseline Reservoir just
        east of Boulder.  The tornado struck a home...tearing off
        part of the roof.  A storage building nearby was nearly
        leveled and 5 trees were uprooted.  The twister then moved
        onto Baseline Reservoir...forming a huge waterspout.  Several
        recreational vehicles and a boat dock were also damaged.
        A nearly stationary line of thunderstorms dumped 4.60 inches
        of rain on portions of Thornton.  Extensive flooding of
        streets and underpasses and other low lying areas was
        reported.  Several businesses were flooded and basements
        in the area were damaged.  Rainfall totaled 1.02 inches at
        Denver International Airport and 1.24 inches at the site of
        the former Stapleton International Airport.  Large hail...up
        to 1 3/4 inches in diameter...fell over the City of Denver
        with 3/4 inch hail measured in Littleton and near Henderson.
      In 1999...high winds developed for a brief time in and near the
        foothills of Boulder.  The Gamow Tower on the University of
        Colorado campus recorded a wind gust to 87 mph.  Winds
        peaked to 71 mph atop Niwot Ridge near the Continental
        Divide west of Boulder.
      In 2003...a small tornado touched down near Strasburg...but did
        no damage.
      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.
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.

$$



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