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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT SAT JUN 21 2025

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

19-21 In 1875...from the 19th to the 21st...smoke from several large
        forest fires in the mountains was visible from the city on
        each of these days.
20-21 In 1897...high winds raked the city overnight.  Southeast winds
        were sustained to 60 mph with gusts as high as 72 mph on the
        20th.  Southeast winds were sustained to 57 mph with gusts
        to 60 mph on the 21st.
       In 2007...a brief hot spell produced two temperature records.
        The high temperature of 97 degrees was tied on the 20th.
        A new record high temperature of 99 degrees was established
        on the 21st.
21    In 1927...north winds were sustained to 40 mph with gusts to
        44 mph.
      In 1984...lightning struck and killed two children standing
        near a tree in a backyard in Lakewood.  Strong thunderstorm
        downbursts caused a wind gust to 58 mph in Northglenn and
        knocked down two power poles near Brighton.
      In 1988...lightning struck a home in Denver...causing about ten
        thousand dollars damage.  Lightning damaged 3 homes in
        Littleton...and also hit a house in Greenwood Village that
        had been struck by lightning 7 years previously.
      In 1991...thunderstorms produced widespread hail across metro
        Denver.  Hail as large as 2 1/2 inches fell at several
        locations across southwest metro Denver.  One storm spotter
        reported hail 8 inches deep near the intersection of I-25
        and C-470.  Heavy rain with the storms caused some street
        flooding.  In Commerce City...several cars were under water...
        and in Westminster a police officer reported water up to
        the doors of his car.  Damage to homes and automobiles
        totaled 55 million dollars.
      In 1992...a tornado touched down briefly near Bennett.
        Another tornado was briefly on the ground near Strasburg.
      In 1994...heavy thunderstorm rains caused flooding in metro
        Denver.  Several vehicles were stalled in the high water
        on I-25.  Lightning struck an underground natural gas line
        in Aurora...causing a fire.  Widespread power outages were
        also observed.
      In 1996...three homes were struck by lightning in Parker.
        The lightning struck the garage of the first home...which
        started a small fire that burned some siding and spread
        into the attic.  A second home sustained damage to the
        attic when a small fire was started.  The third home
        received only minor damage.  Lightning also sparked two
        small grass fires in the area.  A man in Lakewood received
        minor injuries when he was struck by lightning while
        working on a ladder.  A funnel cloud was sighted in Castle
        Rock.  Strong thunderstorm winds downed a large tree near
        Crossroads Mall in Boulder.  A small tornado (F0) briefly
        touched down near Lafayette.  No damage was reported.
      In 1997...one inch diameter hail was measured in Boulder.
      In 2002...a thunderstorm wind gust to 62 mph was recorded at
        Denver International Airport.
      In 2005...severe thunderstorms produced hail to 1 inch in
        diameter in Broomfield along with 3/4 inch hail near
        Arvada.
      In 2006...a man riding a motorcycle was struck and killed by
        lightning on U.S. Highway 36 between Church Ranch Blvd.
        and Sheridan Blvd. in Westminster.  After the biker was
        struck...he and his motorcycle crashed into the center
        concrete median of the highway.  The lightning bolt left
        a crater in the highway asphalt that measured 18 inches
        long...8 inches wide and 4 inches deep.
      In 2010...a severe thunderstorm produced hail up to 1 1/2
        inches in diameter near Morrison.  In Lafayette and
        Louisville...hail up to one inch in diameter was observed.
      In 2014...three small tornadoes touched down in eastern Adams
        County near Barr Lake...Bennett and Front Range Aiport.
        The tornado near Barr Lake damaged some out buildings and
        a storage shed. Minor roof damage to houses in the
        immediate area was reported near 168th Ave and Haymont Rd
        near 168th Ave and Haymont Rd. It was rated an EF1.  The
        others did no damage.
      In 2023...several rounds of large hail and heavy rain moved
        across Denver and the surrounding metro area.  The hail
        ranged in size from 1 to 2 inches in diameter...and caused
        extensive damage to home and vehicles. At Red Rock
        Amphitheatre a torrent of large hail and heavy rain
        blasted the venue.  Nearly 100 people attending a concert
        were injured.  Seven people were taken to hospitals with
        non-life-threatening injuries.  Most of the injuries
        included cuts...welts...bruises and broken bones...mainly
        fingers.  A few were treated for concussions.  Significant
        street flooding occurred in Denver...with storm totals of
        1 to 3 inches.  In Watkins...a flash flood fatality occurred
        along Watkins Avenue...just north of 6th Ave.  The incident
        occurred late in the evening.  The victim`s vehicle was swept
        off the roadway and she tried to cross an area of fast moving
        water overtopping the roadway.  Her vehicle was swept away
        under a bridge...about 400 yards downstream.  Two other vehicles
        were also trapped in the rushing water and the occupants had
        to be rescued.  A new daily record of 1.85 inches of rainfall
        was set for the date at Denver International Airport.
21-22 In 1941...strong thunderstorms produced cloudbursts of rain
        in Boulder County...starting during the late evening of the
        21st and continuing overnight into the 22nd.  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 1989...an 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.

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