Public Information Statement
Issued by NWS Denver/Boulder, CO

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Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUN 17 2017

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

17-18 In 1964...high winds at speeds of 50 to 60 mph with gusts as
        high as 75 mph caused damage to homes...power lines...and
        trees in Boulder.  Non-convective west winds gusting to
        46 mph caused some blowing dust at Stapleton International
        Airport on the 17th.
18    In 1875...a windstorm produced sustained winds to 45 mph
        during the morning hours.  Numerous forest fires along
        the base of the mountains were visible from the city.
      In 1886...northwest winds sustained to 40 mph were the
        strongest of the month that year.
      In 1987...severe thunderstorms produced lightning...large hail...
        a tornado...heavy rain...and strong winds across metro Denver.
        Rainfall totaled 2.50 inches in an hour in Wheat Ridge...
        causing minor flooding.  I-25 was flooded in north-central
        Denver...snarling traffic.  Hail 7/8 inch in diameter fell in
        Louisville with 1 1/2 inch hail near Golden and 1 to 1 3/4
        inch hail in and near Castle Rock.  A tornado touched down
        briefly in Castle Rock.  No damage was reported.  Lightning
        started a small fire that burned half a cabin near
        Evergreen.
      In 1994...a funnel cloud was sighted over Aurora; hail to
        1 3/4 inch diameter fell near Brighton; and hail over an
        inch in diameter fell over Aurora...southeast Denver...
        Louisville...and Boulder.  Lightning struck a home in
        Henderson 9 miles north of Denver and knocked a hole in
        the roof...which caused the ceiling to collapse.  Hail to
        1 1/4 inch diameter was measured at Stapleton International
        Airport.
      In 2002...the Hayman Wildfire in the foothills to the southwest
        of Denver intensified...and the winds aloft carried the smoke
        plume directly over metro Denver...again creating a dense haze
        of smoke which blocked the sun.  Surface visibilities were
        again reduced to as low as 1 1/4 miles at Denver
        International Airport.
      In 2004...severe thunderstorms produced hail to 3/4 inch in
        diameter near Morrison...in Littleton...near Conifer...near
        Castle Rock...and in Aurora near Cherry Creek.
      In 2013...a landspout tornado touched down at DIA. The tornado
        sent 10 thousand travelers on the concourse...on planes and in
        the terminal scrambling to get into tornado shelters. The
        tornado formed just to the south of Runway 35R and then moved
        slowly northwest between Runway 35R and 35L...and moved to
        within one third of a mile of Concourses A and B before
        dissipating. The tornado moved extremely close if not over the
        ASOS (Automated Surface Observation System) and another low
        level wind shear sensor at DIA. The ASOS weather observing
        system reported a 97 mph wind gust...while the wind shear sensor
        reported a wind gust to 109 mph at the same time  indicative
        of an EF1 tornado. There was only minor damage noted to the
        equipment. Nine flights were diverted elsewhere during a
        tornado warning. Severe thunderstorms also produced large hail
        up to quarter size in Adams and Weld Counties.
      In 2014...a severe thunderstorm produced large hail up to quarter
        size near Buckley Air Force Base.  At Denver International
        Airport...a peak wind gust to 55 mph was observed from the
        southwest...along with 0.37 inches of water.
19    In 1874...during the afternoon...large columns of smoke from
        extensive fires in the mountain forests moved over the
        city from the west and southwest.
      In 1875...while no precipitation was measured in the city...
        rainfall over the Palmer Divide caused Cherry Creek to
        rise to the highest level in 10 years.
      In 1977...hail up to 2 inch diameter damaged two patrol cars
        in Castle Rock.
      In 1983  golf ball size hail fell just north of Bennett.
      In 1990...lightning from a thunderstorm struck the roof of a
        house in south Boulder.  Residents of the house were able
        to extinguish the ensuing fire with a garden hose...but not
        before several shingles had burned.
      In 1992...thunderstorms produced hail up to 2 inches in
        diameter in central Douglas County near Castle Rock.  Hail
        was 3 inches deep on I-25 south of Castle Rock.  A funnel
        cloud was sighted near Parker.
      In 1997...a 66-year-old man was knocked unconscious by a bolt
        of lightning while he was golfing at the Eagle Country
        Club in Broomfield.
      In 2000...dry microburst winds gusting to near 70 mph were
        reported across southeast Boulder and northern Jefferson
        counties.  Peak wind gusts included:  68 mph at the National
        Wind Technology Center...67 mph at Jefferson County Airport...
        and 65 mph in Broomfield.
      In 2001...severe thunderstorms produced large hail in the
        foothills southwest of Denver.  Hail as large as 1 3/4 inch
        in diameter fell near Conifer and Bailey.
      In 2002...lightning damaged the Evergreen Fire Protection
        District radio repeater.  One microwave transmitter...the
        main fire channel transmitter...and two solar panel
        controllers were destroyed.  Lightning struck a garage
        and caused a small fire.  Two vehicles parked in the garage
        were damaged.  Hail to 3/4 inch in diameter fell near Castle
        Rock.
      In 2004...severe thunderstorms produced hail to 3/4 inch in
        diameter near Castle Rock...Larkspur...and Golden.
19-21 In 1875...smoke from several large forest fires in the
        mountains was visible from the city on each of these days.
20    In 1888...northwest winds were sustained to 44 mph.
      In 1956...a microburst caused a brief wind gust to 58 mph at
        Stapleton Airport.
      In 1964...hail up to 1 inch in diameter was reported 1 mile
        north of Stapleton International Airport.  A 3 minute hail
        storm at both Stapleton International Airport and Lowry
        Field piled small hail to one half inch deep.
      In 1967...a strong thunderstorm dumped 1.95 inches of rain in
        less than an hour at Stapleton International Airport and
        produced a wind gust to 54 mph.  The storm caused some
        flooding in east Denver and Aurora.  There was widespread
        flooding to streets...basements...and store buildings and
        automobiles.  Hail stones to 3/4 inch in diameter were
        measured at Buckley Field in Aurora.  A tornado touched
        down just south of Littleton...damaging a barn and killing
        several head of cattle.
      In 1985...a wind gust to 61 mph was reported at Golden Gate
        Canyon in the foothills west of Denver.
      In 1986...a man was killed by lightning at Highlands Ranch
        south of Denver.
      In 1987...several tornadoes were sighted across metro
        Denver.  A tornado touched down briefly 5 miles west of
        Parker.  A tornado was sighted just north of Chatfield
        Reservoir.  A tornado just northwest of Watkins was on the
        ground for 15 minutes.  A tornado near Barr Lake was taped
        by a television news crew.  It had a double vortex and was
        on the ground for about 10 minutes.  In addition to the 4
        tornadoes...severe thunderstorms dumped large hail across
        metro Denver.  One inch hail was reported in southeast
        Aurora; 3/4 inch hail fell at the Denver Technology
        Center...Buckley Field...and Franktown.
      In 1992...several short-lived tornadoes occurred in the
        vicinity of Barr Lake.  No injuries or damages were
        reported.  A water spout was sighted over the southern end
        of Barr Lake.  Funnel clouds were also sighted on the
        grounds of the Rocky Mountain Arsenal by National Weather
        Service observers at Stapleton International Airport.
      In 1994...hail up to dime size covered I-25 south of Denver
        and near Sedalia.  Heavy rain caused local flooding on the
        Interstate highway.
      In 1996...strong thunderstorm winds downed several large tree
        limbs in Boulder on the University of Colorado campus.  A
        stop light in the city was also blown down.
      In 1999...lightning sparked an oil tank fire near Brighton.
      In 2001...large hail driven by strong thunderstorm winds raked
        Denver International and Front Range Airports.  Wind gusting
        to 54 mph along with hail as large 2 inches in diameter
        punched at least 14 thousand holes and cracks in the flat
        roofs of several buildings at Denver International Airport.
        In addition...93 planes and hundreds of cars were damaged.
        About 100 flights had to be cancelled...stranding 1500
        travelers.  The airport was completely shut down for about
        20 minutes.  The storm also damaged a ground avoidance radar
        used to track planes on the ground to prevent collisions.
        Damage was estimated at 10 million dollars...not counting the
        damage to the 93 airliners.  The storm moved south and
        struck Watkins with hail as large as 2 1/2 inches in
        diameter and winds gusting to 60 mph.  A least 30 private
        planes at Front Range Airport were destroyed.  The radome
        protecting the National Weather Service doppler radar...which
        was tracking the storm...also sustained damage.  The large
        hail...damaging winds...and heavy rain pummeled a mobile home
        park near Watkins.  In the park...52 mobile homes...14
        recreational vehicles...3 homes...and a commercial building
        were damaged.  Siding was riddled with holes and windows
        were broken.  Vehicles sustained extensive damage and car
        windows were shattered.  A handful of people were treated
        for minor cuts and bruises.  The strong winds also flipped
        a tractor trailer along I-70 near Watkins.  The storm caused
        power outages...which affected about 1200 residents.
        Excluding the damage at Denver International Airport...damage
        estimates totaled 49 million dollars...making the storm the
        costliest in the last 3 years and the 10th costliest since
        1984.  A small tornado touched down just east of Brighton...
        but did no damage.  Hail as large as 2 inches in diameter
        fell near Fort Lupton with 3/4 inch hail measured in
        Bennett.  Precipitation from the storm totaled only 0.23
        inch at Denver International Airport.
      In 2002...heavy rain fell near the Hayman Wildfire burn area.
        Flash flooding washed out a 40-foot section of the access
        road to Cheeseman Reservoir.  Some debris was washed against
        a gate...blocking the road.  Hail to 1 1/2 inches in diameter
        fell near Central City with 3/4 inch hail near Blackhawk.
      In 2003...hail as large as 1 inch in diameter fell near Bennett
        and Strasburg with 3/4 inch hail measured in Denver...Golden...
        at Centennial Airport...and near Parker.  Hail as large as
        7/8 inch was reported in Arvada.
      In 2004...a severe thunderstorm produced hail to 3/4 inch in
        diameter in and near Brighton.
      In 2005...severe thunderstorms produced large hail near the
        Palmer Divide.  Hail to 1 inch in diameter was measured
        near Larkspur with 7/8 inch hail near Sedalia and 3/4 inch
        hail in Greenland.  An apparent thunderstorm outflow produced
        a wind gust to 59 mph at Denver International Airport during
        the evening hours.
      In 2010...lightning struck a home in Centenniel and sparked a
        fire which caused extensive damage.
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.
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 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.
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
        Rock.
      In 1991...thunderstorms produced golf ball size hail in
        Lafayette.  The strongest storms occurred north of metro
        Denver.
      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
        Boulder.
      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.
  23    In 1874...a thunderstorm pelted the city with hail and brief
        heavy rain.  Rainfall was 0.30 inch in 10 minutes.  Total
        rainfall was 0.36 inch for the day.  Hail to 1/4 inch in
        diameter destroyed the strawberry fields near the limits
        of the city.  The thunderstorm dropped the temperature
        from 93 degrees to 80 degrees in 5 minutes.
      In 1887...north winds were sustained to 42 mph.
      In 1954...the temperature climbed to a high of 102 degrees...
        setting a record for the date.
      In 1962...lightning struck and injured a man near Buffalo...
        southwest of Denver...while he was riding in the back of a
        pick-up truck.  He suffered multiple bruises...cuts...and
        shock.
      In 1965...an apparent tornado was reported 18 miles east of
        Denver.  No damage was reported.
      In 1975...hail up to 3/4 inch in diameter fell at Stapleton
        International Airport and over other parts of metro Denver.
        Four funnel clouds were sighted:  10 miles northeast of
        Denver...south of Boulder...southeast of Boulder...and south
        of Aurora.
      In 1976...heavy rain and eroding water collapsed a retaining
        wall in Thornton.
      In 1981...a thunderstorm produced wind gusts to 60 mph in
        Littleton.
      In 1982...two separate bolts of lightning injured three men in
        southwest Denver.  Two buildings were slightly damaged.
      In 1987...severe thunderstorms produced large hail across
        metro Denver.  Golf ball size hail fell in Littleton...near
        Morrison...and in southeast Aurora with 1 1/2 inch hail
        recorded in south Lakewood and 1 inch hail reported in
        Littleton...Arvada...and at Cherry Creek Dam.  Two funnel
        clouds were sighted 20 miles southwest of Stapleton
        International Airport.
      In 1993...non-convective high winds developed along the Front
        Range foothills.  Wind gusts to 70 mph were common near the
        foothills with numerous tree limbs broken by the winds.
        North winds gusting to 36 mph were recorded at Stapleton
        International Airport.
      In 1999...hail as large as 1 inch in diameter was measured
        in the City of Denver with 3/4 inch hail in Littleton.
      In 2001...a severe thunderstorm produced large hail in
        south metro Denver.  Hail as large as 1 1/2 inch in
        diameter fell in Littleton with 1 1/4 inch hail near
        Sheridan.
      In 2009...hail up to 1 inch in diameter was observed near
        Parker.  At Denver Interationaal Airport...a total of
        1.64 inches was measured in a 24-hr period...setting
        a new record for the date.
      In 2014...severe thunderstorms produced large hail near
        Commerce City and Fort Lupton.  The hail sizes ranged
        from 1 to 1 1/2 inches in diameter.
24    In 1873...there was a great deal of smoke from a fire in the
        mountains to the southwest of the city during the late
        afternoon.
      In 1875...smoke from forest fires in the mountains to the
        southwest could plainly be seen from the city.
      In 1958...a strong cold front produced a north wind gust to
        55 mph at Stapleton Airport where blowing dust briefly
        reduced the visibility to 1 mile.
      In 1982...one inch diameter hail pelted west Denver.  A half
        inch of rain drenched the suburb of Englewood in 10 minutes.
        Hail piled up to 5 inches deep...snarling rush hour traffic
        and damaging some stores in a shopping center when the roof
        started leaking.
      In 1988...lightning destroyed the chimney of a house near
        Evergreen.  Another bolt demolished a radio transmitter in
        the area.
      In 1989...golf ball size hail cut a swath 2 1/2 miles wide
        through open country 14 miles southwest of Bennett.  The
        storm also dropped 1.75 inches of rain on the area.  Hail
        to 3/4 inch in diameter damaged the car of a storm chaser
        just south of Bennett.
      In 1996...a funnel cloud was sighted near Hudson where hail
        up to 1 3/4 inch diameter fell.  Lightning struck a home
        in Littleton...which sparked a small fire on the roof.
        Thunderstorm wind gusts to 64 mph were recorded in Castle
        Rock.
      In 2005...severe thunderstorms produced large hail across
        metro Denver.  Hail as large as 1 inch in diameter fell
        near Castle Rock and Thornton.  Hail to 3/4 inch was
        measured near Northglenn and Fort Lupton.
      In 2006...severe thunderstorms raked metro Denver.  Hail as
        large as 2 1/2 inches in diameter shattered automobile
        windshields in and near Boulder.  Hail to 1 3/4 inches
        pounded areas in and near Lakewood and Morrison.  Hail to
        1 inch was measured in Wheat Ridge along with 7/8 inch
        hail in Arvada.  Severe thunderstorm wind gusts estimated
        to 69 mph snapped power lines for a distance of one quarter
        mile near Castle Rock.  Severe thunderstorm winds were
        measured to 60 mph in Sedalia.  Hail as large as 1 inch
        in diameter fell near Evergreen and Castle Rock.  Hail to
        3/4 inch in diameter was reported in Louviers and near
        Conifer.
      In 2014...damaging hail...from 1 to 2 inches in diameter...
        caused extensive damage to homes and automobiles over parts
        of Arapahoe and Douglas Counties including areas in and
        near:  Aurora-Cherry Creek...Buckley Air Force Base...Denver
        International Airport and Parker.  Officially...0.06 inches
        of rain fell at Denver International Airport...with a peak
        wind gust of 33 mph from the southeast.

$$



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