Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 220859

Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT THU JUN 22 2017

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

21-22 In 1941...strong thunderstorms produced cloudbursts of rain
        in Boulder County...starting during the late evening of the
        21st and continuing overnight.  The heavy rains over the
        Boulder Creek...Left Hand Creek...and South St Vrain River
        basins produced flooding in already swollen streams and
        turned dry gulches into raging torrents.  The force of the
        floodwaters swept a man from the arms of his wife to his
        death...severely damaged canyon homes and swept others away...
        and hurtled a car down a steep embankment after the driver
        narrowly escaped.  West of Boulder...the Boulder Canyon
        highway was littered with rocks and debris and collapsed
        when two culverts were washed away.  The flood waters
        washed much debris down Four Mile Canyon...damaging the road
        near the creek bed.  A bridge over Dry Creek just south of
        Niwot was completely washed away.
      In 1964...scattered hail and rain caused property damage and
        local flooding in Boulder.
      In unseasonably cold weather system produced strong
        winds over much of metro Denver and snowfall in the
        foothills as low as 7500 feet elevation.  One to 6 inches
        of snow fell in the foothills west of Denver with 15 inches
        reported on the summit of Mount Evans.  Six inches of snow
        were measured at Conifer.  Rainfall totaled only 0.09 inch
        at Stapleton International Airport where northwest winds
        gusted to 29 mph on the 21st.
22    In 1872...small sandstorms...frequently seen on the prairie...
        occasionally passed through the city.
      In 1983...3/4 inch hail was observed at Deckers...and a
        thunderstorm produced wind gusts to 55 mph at Littleton.
      In 1988...a tornado was spotted one mile east of Brighton; it
        remained on the ground for about 6 minutes...but did no
        reportable damage.  Lightning damaged a home near Castle
      In 1991...thunderstorms produced golf ball size hail in
        Lafayette.  The strongest storms occurred north of metro
      In 1992...nickel size hail was reported just east of Parker.
      In 1995...large hail 3/4 to 1 3/4 inches in diameter fell in
        Castle Rock where a funnel cloud was sighted.  Hail 3/4
        inch to 1 inch in diameter fell in south Denver and Aurora.
        A funnel cloud was also sighted over Chatfield Reservoir.
        In Bennett...very strong dry microburst winds of unknown
        speeds ripped a 14- by 48-foot metal roof off of a barn.
        The roof was tossed approximately 250 yards.  A few 150-
        pound railroad ties were moved 10 to 15 feet.
      In 1997...a tornado touched down near the Adams County
        Fair Grounds northeast of Denver...uprooting several
        trees and damaging a car.  A dry microburst produced
        a brief wind gust to 69 mph at Jefferson County Airport.
        A small brief tornado was sighted near Hudson...but did
        no reported damage.
      In 1998...3/4 inch hail fell near Hudson.
      In 1999...thunderstorm winds gusted to 63 mph at Denver
        International Airport.
      In 2003...hail as large as 2 inches in diameter was measured
        in Fort Lupton with 3/4 inch hail in Erie and near
      In 2006...a small tornado (F0) touched down near Franktown...
        but caused no damage.
      In 2008...strong winds from dry microbursts developed over
        parts of southern Weld and western Arapahoe Counties.
        A peak gust of 60 mph was observed in Centenniel.
        Near Frederick...strong winds snapped 3 power poles and
        sparked a small grassfire near State Highway 52 and
        Interstate 25.  At Denver International Airport...a peak
        gust of 31 mph was observed.
      In 2009...hail up to 2 inches in diameter was observed near
        Crescent in Boulder County.
22-26 In 2012...the maximum temperature exceeded 100 degrees for
        five consecutive days.  Two of the high temperatures on
        the 25th and 26th peaked at 105 degrees...which set the
        all time record for the month of June and tied the all
        time maximum temperature for Denver.

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