Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 110045

Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUN 10 2017

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

1-30  In 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.
10-11 In 1882...heavy thunderstorm rains on the morning of the
        10th caused a rapid rise in Dry Creek...which enters the
        South Platte River at Fairview in present day south
        Denver.  This...combined with additional heavy rainfall
        on the 11th caused the South Platte River to overflow.
        Five people drowned and several houses were destroyed.
        Total losses in the city and suburbs was estimated at 75
        thousand dollars.  Total rainfall in central Denver was
        2.21 inches over the 2 days.
      In 2013...the high temperature of 99 degrees on the 10th
        broke the previous record maximum temperature of 97 for
        the date.  Also...the minimum temperature of 68 and high
        temperature of 100 degrees on the 11th established a new
        record for highest minimum and maximum temperature for
        the date.
11    In 1947...a trace of snow fell over downtown Denver.  Low
        temperature of 34 degrees was a record minimum for the
      In 1962...hail caused extensive crop damage near Hudson
        northeast of Denver.
      In 1970...stratiform rainfall totaled 3.16 inches at Stapleton
        International Airport.  This was the greatest amount of
        precipitation ever recorded on a calendar day in June.
        In was the greatest amount of precipitation
        ever measured during any 24-hour period in June.  The high
        temperature climbed to only 51 degrees...which was a record
        low maximum for the date.
      In 1973...large hail from 3/4 to 1 1/2 inches in diameter fell
        west of Boulder.
      In ball size hail was reported just south of
        Arapahoe County Centennial Airport.  Lightning
        struck a home in Lakewood.
      In 1988...a 30-year-old man was seriously injured by lightning
        while mowing his lawn in Denver.
      In 1992...lightning started two house fires in the southern
        Denver suburbs where 3/4 inch hail fell and a funnel cloud
        was sighted.
      In 1999...severe thunderstorms formed over the Palmer Divide
        and moved across Douglas...Elbert...and Adams counties.
        Hail as large as 1 inch in diameter was reported in and
        near Castle Rock...Sedalia...Franktown...and Aurora.  Hail
        as large as golfballs accumulated several inches deep
        and caused a large section of a corrugated metal roof of
        a greenhouse complex to collapse near Franktown.  About a
        third of the roof covering the 30 thousand square foot
        building collapsed.  Thirty-five workers were trapped in
        the debris...but only 3 were treated for minor injuries.
        Hail 1 to 2 feet deep blocked the roadways and slowed the
        arrival of emergency vehicles.  Damage to the building
        was estimated to be around 3 million dollars.
      In 2006...a man was struck and killed by lightning as he was
        returning to his car after leaving the Mile High Flea
        Market near Henderson.  Two others were knocked down...but
        not injured by the lightning strike.  Severe thunderstorms
        produced large hail across the northern portion of metro
        Denver.  Hail to 1 1/4 inches in diameter was measured in
        Arvada...with 1 inch diameter hail reported near Fort
        Lupton.  Hail to 7/8 inch in diameter was recorded near
        Brighton...and hail...3/4 inch in diameter...fell near
      In 2009...large hail pummelled portions of Adams...Arapahoe...
        Elbert and Douglas Counties.  Hail up to 1 1/2 inches in
        diameter was measured near Parker.
      In 2010...severe thunderstorms producing very large hail
        pummeled portions of Front Range Foothills and Urban
        Corridor.  The large hail ranged in size from 1 to
        2 1/2 inches...caused extensive damage to home and
        vehicles. The hardest hit areas included:  Brighton...
        Castle Rock...Greenland...Idledale...Mountain View and
        Thornton. The combination of heavy rain and hail
        destroyed 50 thousand acres of cropland in southeast Weld
        County.  Flash flooding forced the closure of State
        Highway 52...east of Prospect Valley. Several county roads
        were either flooded or completely washed out.  At Denver
        International Airport...0.69 inches of rainfall was
11-14 In 1999...damage from several hailstorms in and near metro
        Denver totaled 35 million dollars.  About 17.5 million
        dollars was from automobile claims with another 17.5
        million in homeowner claims.  The areas hardest hit by the
        storms included Castle Rock...Commerce City...Evergreen...
        and Golden.
12    In 1901...south winds were sustained to 45 mph with an extreme
        velocity to 47 mph.
      In 1917...northwest winds were sustained to 40 mph with gusts
        to 45 mph.
      In 1927...flooding on Little Dry Creek in Englewood resulted in
        two deaths.
      In 1947...a trace of snow fell over downtown Denver during the
        early morning.  This was the latest last snow of the season
        (trace or more).  This also marked the end of the longest
        snow season...264 days...from the first snow...a trace...on
        September 22...1946.  High temperature of 43 degrees was a
        record low maximum for the date.  Minimum temperature of 33
        degrees was a record low for the date.
      In 1971...a funnel cloud sighted over Arvada possibly touched
        down at the base of the foothills.  The public reported
        3/4 inch to 1 inch diameter hail over the City of Denver.
      In 1974...strong thunderstorm winds caused damage to power
        lines in metro Denver.  Northwest winds gusted to 45 mph
        at Stapleton International Airport.
      In 1975...a thunderstorm wind gust to 56 mph was recorded at
        Stapleton International Airport.
      In 1982...three small tornadoes were sighted near Bennett.
        One of the twisters caused minor crop and road damage along
        its path.  A brief tornado was sighted by National Weather
        Service observers at Stapleton International Airport.
      In 1983...3/4 inch hail fell in Boulder.  Golf ball to 3/4 inch
        size hail fell in Arvada...denting cars and house roofs.
        Over a thousand hail damage insurance claims were filed from
        the area.  Golf ball size hail also fell in Northglenn and
        Bennett...1 to 2 inch hail in Thornton...2 1/2 inch hail in
        northeast of Denver.  A tornado was sighted 10 miles
        northeast of Stapleton International Airport; it was only
        on the ground for 1 to 2 minutes.
      In 1984...large hail pelted many parts of southern metro
        Denver.  Fifteen aircraft were damaged by golf ball
        size hail at Centennial Airport.  Golf ball size hail was
        reported in south Denver...and 3/4 inch hail was measured
        in southeast Aurora.
      In 1987...a small weak tornado touched down for about 3
        minutes near the intersection of I-70 and Colorado Blvd.
        in northeast Denver.  No damage was recorded.  A microburst
        wind gust to 53 mph was recorded at Stapleton International
      In the City of Denver...lightning struck a tree under
        which seven people were picnicking.  One person was
        critically injured.  The others received only minor
      In ball size hail fell in Evergreen.
      In 1994...microburst winds gusting to 53 mph kicked up some
        blowing dust at Stapleton International Airport.
      In 1996...lightning struck a house in Parker...which sparked a
        fire.  The bolt was strong enough to blow nails out of the
        drywall in one room.  About 85 percent of the house was
        damaged.  No dollar estimate of the damage was available.
        Lightning also struck a power line in Boulder...which left
        250 customers without electricity for a short time.
      In 1997...a tornado touched down near Parker...damaging some
        construction equipment.  Hail to 2 inches in diameter was
        measured in Henderson.  One inch diameter hail fell in the
        City of Denver with 3/4 inch hail measured in Lakewood.
      In 1999...hail as large as 1 1/2 inches in diameter struck
        Hudson.  A funnel cloud was sighted by ramp personnel to
        the east of Denver International Airport.
      In 2003...lightning blew a hole in the roof of a house in
        Highlands Ranch.  The bolt knocked several holes in the
        bedroom ceiling and damaged the home`s electrical system.
      In 2004...lightning struck a home in Louisville...but caused
        only minor damage.
      In 2006...a strong microburst wind gust...estimated at 69 mph...
        ripped the roof off a horse barn near the intersection of
        Havana Street and Smith Road in Denver.  A 13 year old
        girl was injured...when she was thrown from a horse inside
        the barn at the time the roof was being torn off.  A
        thunderstorm produced a microburst wind gust to 54 mph
        and a trace of rainfall at Denver International Airport.
        A severe thunderstorm produced hail to 0.75 inch near
12-17 In 2000...two large wildfires developed in the Front Range
        foothills as careless campers and very dry conditions
        proved to be a dangerous combination.  Strong winds
        gusting in excess of 60 mph on the 13th fanned the flames...
        spreading both wildfires out of control.  Winds gusted to
        78 mph atop Niwot Ridge near the Continental Divide west
        of Boulder.  The Hi Meadows Wildfire...about 35 miles
        southwest of Denver...consumed nearly 11 thousand acres and
        80 structures...mostly high priced homes.  The Bobcat
        Wildfire...located about 12 miles southwest of Fort Collins...
        consumed nearly 11 thousand acres and 22 structures.  Late
        on the 16th...a strong cold front moved south over the Great
        Plains into northeastern Colorado.  Low level upslope
        conditions developed in the wake of the front...producing
        2 to 4 inches of snowfall overnight at elevations above
        8 thousand feet.  Firefighters were able to contain both
        fires shortly thereafter.
13    In 1956...a microburst caused a brief wind gust to 59 mph at
        Stapleton Airport.
      In unconfirmed tornado appeared to touch the ground
        in the vicinity of Franktown.  No damage was reported from
        the twister.
      In 1968...a violent gust of wind...possibly associated with a
        thunderstorm...caused 75 hundred dollars damage in Boulder.
      In 1973...hail...1/2 to 3/4 inch in diameter...fell over
        Lakewood.  Flash flooding occurred in west Denver from the
        same storm.
      In 1974...a thunderstorm wind gust to 64 mph was recorded at
        Stapleton International Airport.
      In 1977...hail the size of table tennis balls...1 1/2 inches in
        diameter...was reported in Boulder.
      In 1981...large hail to golf ball size fell in Denver...
        Northglenn...and Brighton.  Hail as large as baseballs was
        reported in Federal Heights.
      In of the worst hailstorms ever experienced in metro
        Denver struck the northwestern suburbs of Arvada...Wheat
        Ridge...and Lakewood...but large hail also fell in Golden...
        southeast Denver...and Aurora.  Homes and other buildings
        sustained around 200 million dollars in damage.  Thousands
        of cars were battered by giant hailstones...and total damage
        to vehicles was estimated at 150 million dollars.  In some ball size hail fell continuously for 30 to 40
        minutes.  Some places were pelted with a few stones as
        large as grapefruits!  Roofs on thousands of structures
        were severely damaged.  Uncounted car windshields were
        broken; two-thirds of Arvada`s police cars were rendered
        inoperable.  Torrential rains...with as much as 4.75 inches
        in Lakewood clogged drains and caused widespread damage
        from flooding.  In some places hail was washed into drifts
        several feet deep.  About 20 people were injured by the
        giant hailstones.  One couple was hospitalized.  A woman
        drowned when she was trapped under a trailer by high water.
        Only pea size hail fell at Stapleton International Airport.
      In 1988...2 inch hail fell in Parker.  Soft hail 1 inch in
        diameter fell at the mouth of Turkey Creek Canyon 5 miles
        southeast of Morrison.  Hail between 1 inch and 1 3/4
        inches fell at both Bennett and Strasburg.  A tornado
        touched down briefly at Strasburg.  A brief funnel cloud
        was sighted by National Weather Service observers 15 miles
        southwest of Stapleton International Airport.
      In 1991...a Boulder man was injured when struck by lightning
        while in a tent.  He received only minor burns.
      In 1997...lightning struck a home in Denver.  The extent of
        the damage was unknown.  A home in Littleton was also
        struck.  The house caught fire...but the extent of the
        damage was not known.
      In 1998...a strong mountain wave produced a brief period of
        high winds along the Front Range.  A small building atop
        Squaw Pass west of Denver was blown down.  Tree limbs
        were downed across metro Denver.  Peak wind gusts
        included:  80 mph on Squaw Pass...69 mph at Jefferson
        County Airport near Broomfield...and 60 mph in Westminster
        and at the National Center for Atmospheric Research in
        Boulder.  West-northwest winds gusted to 51 mph at Denver
        International Airport.
      In 2001...high winds developed briefly in Boulder County.
        A peak wind gust to 76 mph was recorded at the National
        Center for Atmospheric Research atop the mesa in Boulder.
        A wind gust to 72 mph was recorded at Southern Hills Middle
        School in Boulder.  Lightning started a small fire...which
        damaged the roof of a house in Greenwood Village.
      In 2009...severe thunderstorms produced hail up to one inch
        in diameter near Arvada and well as 7 miles
        north-northwest of Front Range Airport near Watkins.
13-14 In 2006...the high temperature of 99 degrees on the 13th
        equaled the record maximum temperature for the date first
        set in 1994.  The high temperature of 102 degrees on the
        14th was a new record maximum temperature for the date.
14    In evening thunderstorm produced lightning which
        struck several houses and killed a cow in the bottom land
        of the South Platte River
      In 1886...hail as large as 3/4 inch in diameter fell in the
        city.  Precipitation was only 0.10 inch.
      In 1887...south winds were sustained to 41 mph.
      In 1900...a thunderstorm produced northwest winds to 51 mph
        with gusts to 61 mph...but only a trace of rain.
      In 1923...a severe thunderstorm pelted the city with hail.
        The stones ranged in diameter from 0.2 to 0.8 inch.
        Gardens and greenhouses suffered considerable damage.
        Rainfall was only 0.14 inch downtown.
      In workman was killed and 4 others injured in
        Lakewood when a partly built apartment building collapsed
        in strong winds.  Microburst wind gusts to 54 mph caused
        some blowing dust at Stapleton Airport.
      In 1967...tornadoes touched down briefly 3 miles west of
        Franktown and 4 miles northeast of Parker.  No damage was
        reported.  Numerous funnel clouds were reported over south
        metro 5 miles south of 2 to 3 miles
        north of Castle Rock...and two near Littleton.
      In 1968...a microburst wind gust to 52 mph was recorded at
        Stapleton International Airport.
      In 1972...1 3/4 inch hail was reported in Wheat Ridge.
      In 1976...high winds...unusually strong for this late in the
        season...raked metro Denver.  Wind gusts estimated to 100
        mph tore 24 boats from their moorings and damaged a total
        of 47 boats at Boulder Reservoir.  Wind gusts to 82 mph
        were recorded in Boulder.  The strong winds toppled the
        wind mast at a radio station in Boulder.  An automobile
        was smashed by a fallen tree in Boulder.  Other damage in
        Boulder was minor...but power outages occurred when tree
        limbs fell on  power lines.  At Jefferson County Airport
        near Broomfield...wind gusts to 78 mph were recorded with
        87 mph gusts clocked at Rocky Flats Nuclear plant south of
        Boulder.  Wind gusts to 66 mph were observed in Littleton...
        and northwest winds gusted to 46 mph at Stapleton
        International Airport.  The strong winds collapsed a barn
        near Arvada.  Several horses received minor injuries.
        Thirty trees were uprooted or broken in Denver.  Four major
        power outages occurred from west Denver and Lakewood to the
      In 1982...the worst hailstorm in 17 years struck Commerce
        City.  The storm left 4 to 8 inches of hail on the ground.
        A few of the stones were as large as golf balls.  Many
        vehicles were dented...and some windshields were shattered.
        Roofs of homes were damaged.   Total damage was estimated
        at over one million dollars.  Hail to 1 inch in diameter
        also fell in Littleton.  Only 1/4 inch hail was measured
        at Stapleton International Airport.
      In 1988...lightning ripped a small hole in the roof of a home
        in the southern part of Boulder.  There were some power
        outages in the area.
      In off duty National Weather Service employee
        reported hail to 1 inch diameter in Westminster.
      In inch diameter hail fell in Bennett...and 3/4
        inch hail was measured in Littleton.
      In 1999...hail as large as 1 1/2 inches in diameter hit Aurora.
        Lightning sparked two small fires at separate residences
        near the Hiwan Country Club in Evergreen.
      In 2004...lightning sparked two small fires near Jamestown.
        One was in Geer Canyon and the other 7.5 miles up Sunshine
        Canyon.  Both were quickly contained and caused no damage
        to structures in the area.
      In 2009...a complex of severe thunderstorm produced large hail
        damaging thunderstorm and funnel clouds across parts of the
        Urban Corridor.  The line formed along a boundary over the
        western suburbs of Denver then moved east. The boundary
        produced at least one well defined funnel cloud that could
        be observed by stadium full of baseball fans at Coors
        Field.  Large hail...up to 1 3/4 inches in diameter...was
        reported in Arvada...Broomfield...Denver...Federal Heights and
        Northglenn.  In addition...the storm produced peak wind gusts
        from 60 to 74 mph.  At Denver International Airport...a peak
        wind gust to 58 mph was observed from the west-northwest.
      In 2014...severe thunderstorms broke out across the Urban
        Corridor. Large hail...ranging in size from 1 to 2 inches
        in diameter...was observed. The area extended from around
        Englewood to Aurora and included:  Brookridge...Cherry Knolls...
        Greenwood Village and south Denver. As many as 212 thousand
        residences were potentially impacted by the storms. The hail
        shattered windshields and damaged vehicles.
15    In 1907...south winds were sustained to 40 mph.  The winds
        were strong all day.
      In 1908...the hail storm was unusually severe.  Heavy clouds
        moved over the city from the north and northwest...and by
        late morning the weather had become very threatening.
        Heavy rain with intermittent hail from pea to 3/4 inch
        in diameter fell near noon.  The fall of rain and hail
        totaled 0.68 inch of precipitation with 0.35 inch in just
        5 minutes.  The temperature fell from 71 degrees to 51
        degrees during the storm.  The hail did considerable
        damage to trees...gardens...and hot houses.  On sidewalks
        with northern exposures...the hail ranged in depth from
        2 to 6 inches.  West winds were sustained to 29 mph during
        the storm.
      In 1956...strong southeast winds raked metro Denver all day.
        Sustained winds at 44 mph with gusts as high as 61 mph were
        recorded at Stapleton Airport where blowing dust briefly
        reduced the visibility to 2 miles.
      In ball size hail pelted southern and central
        Aurora.  Rainfall of 2.06 inches over central Aurora in
        just over an hour produced local street flooding.
      In ball size hail fell in the southern part of
      In 1988...several tornadoes developed across metro Denver.
        One tornado touched down just northeast of the Rocky
        Mountain Arsenal.  The twister moved very slowly and did no
        damage...except to demolish a small electrical substation...
        even though it was on the ground for nearly 30 minutes.
        Later...another tornado was sighted east of Brighton about
        2 miles north of Barr Lake.  An F2 tornado cut a swath
        through northeast Denver.  The main path went through a
        thickly wooded area for about 6 blocks and uprooted about
        500 city owned trees...many of them large elms 75 to 100
        years old.  Hundreds of privately owned trees were also
        sucked from the ground by the slow moving twister...which was
        filmed by a news team in a helicopter as it uprooted trees.
        The replacement cost to the city owned trees was estimated
        at 1.5 million dollars.  The twister did little damage to
        buildings.  Some homes suffered roof and chimney damage...a
        gas main was ruptured...and some cars were damaged by
        falling trees.  The uprooted trees also caused curb and
        sidewalk damage and cut some electrical wires.  The funnel
        cloud passed close to Stapleton International Airport.
        Aircraft operations were shut down...and the tower was
        evacuated.  The tornado was on the ground for almost 25
        minutes.  An F3 tornado cut an erratic path through south
        Denver for about 25 minutes...causing extensive damage in
        at least 3 areas.  The twister damaged about 85 buildings...
        20 severely; the total loss was estimated at 5 to 10
        million dollars.  Many cars were severely damaged; at
        least 15 vehicles were overturned.  One trailer was lifted
        onto the top of a building that had just been unroofed;
        numerous antique cars inside the building were damaged.
        A Ford Bronco was blown over a church...and landed 100 yards
        away.  A metal storage shed was deposited far above the
        ground in some power lines.  The tornado uprooted many
        trees on a golf course.  No one was seriously hurt...although
        seven people suffered minor injuries from flying debris.
        A golfer was thrown 40 feet...but was not hurt;  a man
        clinging to a telephone pole was unscathed...but lost both
        shoes...a sock...and buttons off his shirt.  A woman holding
        a baby was sucked through a broken convenience store window...
        but was unhurt.  A dog...tethered to the ground by its leash...
        was suspended in the air by the twister.  Uprooted trees
        crushed cars and damaged curbs and sidewalks.  People in
        downtown Denver could see three tornadoes occurring
        simultaneously.  Hail as large as 1 3/8 inches in diameter
        fell in extreme southeast Aurora.
      In 1997...a tornado touched down briefly at the Colorado
        National Speedway near Dacono north of Denver.  The
        tornado ripped through the south grandstand causing at
        least 50 thousand dollars in damage to a shed...kiosk...
        bleachers...and several concession stands.
      In 2004...a tornado touched down briefly near Castle Rock
        and blew the roof off a machine shop.  A tornado near
        Elizabeth destroyed a barn and caused roof damage to a
        home.  Two other barns on nearby properties were damaged
        extensively.  The twister also caused widespread tree
        damage in the area.  A tornado also touched down near
        Bennett and Strasburg...but did no damage.
      In 2009...thunderstorm winds knocked a tree on to two
        vehicles in Boulder.  One of the drivers was injured
        when the tree smashed into the windshield of her car.
      In 2012...a severe thunderstorm produced hail from quarter to
        half dollar size near Littleton and Highlands Ranch.  A
        weak short lived tornado (EF0) also touched down near
15-16 In 1963...heavy rain and hail ravaged metro Denver.  In
        southeast Denver...heavy rain flooded homes and streets.
        Hail to a depth of 4 inches on the ground stripped trees
        and plants and drifted to depths of 3 to 4 feet in some
        areas.  Flood waters on the Valley Highway were 19 feet
        deep in places...trapping many cars.  Many creeks were
        running over their banks.  On the 15th...the main
        thunderstorm cell passed over south Denver...dumping as
        much as 4 inches of rain in 90 minutes.  Precipitation
        at Stapleton Airport totaled 0.91 inch on the 15th and
        1.31 inches on the 16th.  A funnel cloud was sighted
        briefly 4 miles to the south-southeast of Stapleton
        Airport on the 15th.  Damage from hail and flooding
        amounted to near a million dollars.
16    In 1950...very heavy rain and hail storms in southwest Denver
        caused an estimated 750 thousand dollars in hail and flood
        damage.  Thunderstorms produced 2.06 inches of rain at
        Stapleton Airport with 2.23 inches of rain measured in
        downtown Denver.
      In 1965...a tornado...15 miles south-southeast of Denver...
        touched down and damaged two houses in northern Douglas
        County.  Three golfers at a country club and a women who
        lived north of Castle Rock were injured by falling
      In 1983...a microburst wind gust to 54 mph was recorded at
        Stapleton International Airport.
      In 1984...a tornado touched down briefly in Parker.  No damage
        was reported.
      In 1986...lightning injured 5 people just north of the Denver
        city limits in Adams county.  The victims were members of
        a drum and bugle corps and were standing near a metal
        scaffold.  Heavy rain from the storm also caused street
        flooding in the metro area.
      In 1991...hail to golf ball size fell at Conifer.
      In 1992...a rare mid-June high wind event wrecked havoc
        over metro Denver when a Pacific cold front moved across
        the Rocky Mountains.  Strong winds at speeds of 40 to 50
        mph were common along the Front Range foothills.  Winds
        reaching 107 mph in the foothills west of Denver and 79 mph
        at Longmont...caused damage ranging from trees being toppled
        to large trucks being rolled over.  Strong winds estimated
        at 75 mph rolled a 35-foot truck carrying building supplies
        on U.S. Highway 36 north of Boulder.  The truck driver and
        a passenger as well as the driver of another car were
        slightly injured.  The winds downed power lines.  The
        gambling towns of Central City and Blackhawk were without
        power for a couple of hours.  West winds reached 43 mph at
        Stapleton International Airport.
      In 1996...a small tornado touched down in the foothills
        southwest of Boulder near Pinecliffe...knocking down
        50 to 100 large pine trees.  A house nearby sustained
        damage when shingles were ripped from the roof.  The tornado
        also picked up a 17-foot sailboat with attached trailer and
        carried it 25 feet into a nearby tree.  In addition...
        thunderstorm wind gusts to 46 mph were measured at Denver
        International Airport.
      In 2004...hail as large as 1 inch in diameter fell near Castle
        Rock.  Hail to 3/4 inch was measured near Bennett.
      In 2005...severe thunderstorms produced hail as large as 1 inch
        in diameter in Centennial.
      In 2011...severe thunderstorms produced and damaging across
         parts of metropolitan Denver. In Lakewood...a tree blew down
         and landed on at least five cars. At Centenniel Airport...a
         section of a roof on a hangar was ripped off the strong
         winds.  A peak wind gust of 46 mph was recorded at
         Centenniel Airport and Denver International Airport in
         the evening.
16-17 In 1965...on the afternoon and evening of the 16th...violent
        thunderstorms produced extremely heavy cloudbursts of rain
        over the Palmer Divide and sent a wall of water as high as
        20 feet down both branches of Plum Creek into the South
        Platte River and through metro Denver.  The heavy rainfall
        produced the most devastating flood in the history of
        Denver.  Rainfall totaled 14.0 inches in 3 hours at both
        Larkspur and Palmer Lake with 12.0 inches recorded in Castle
        Rock.  The flood waters caused extensive damage to roads and
        bridges in Larkspur...Castle Rock...and Sedalia...including
        washing out the I-25 bridge over East Plum Creek in Castle
        Rock.  The citizens of metro Denver received reports of the
        flooding to the south and had a few hours to initiate
        evacuation procedures along the South Platte River...greatly
        limiting the loss of life.  By evening...the flood reached
        Littleton where an heroic effort was made to save nearly
        150 horses at the Centennial Racetrack...which was
        completely inundated by the flood waters.  As the flood
        proceeded through the City of Denver...the river became more
        than 1/2 mile wide and destroyed all homes...trailer courts...
        and businesses in its path.  The waters contained debris
        ranging from refrigerators to old cars.  As many as 26
        bridges were damaged or destroyed...including the 6th Avenue
        freeway bridge across the South Platte.  Both Public Service
        Company power plants were shut down by the flood.  The King
        Soopers grocery chain bakery was inundated.  About midnight...
        the torrent crested at 25 feet above normal with flow
        exceeding 40 times normal and is the record flood on the
        South Platte and many of its tributaries.  The flood caused
        230 million dollars in damage and 8 deaths along the entire
        South Platte River basin.  The intense rain also caused
        flooding along Cherry Creek in Denver...on Toll Gate and Sand
        Creeks in east metro Denver...and on Kiowa and Bijou Creeks
        to the east of Denver.  The South Platte River flood closed
        nearly every major east-west highway into Denver...nearly
        isolating the city.  The flood caused heavy damage to state
        and county roads in the area.  Railroads were also hard hit
        with the main yards in lower downtown inundated.  Sewerage...
        water supply facilities...and irrigation works also received
        heavy flood damage.  The flood crest did not reach Nebraska
        until the 20th.
17    In 1915...northwest winds were sustained to 41 mph with an
        extreme velocity to 42 mph.
      In 1967...this was the 24th consecutive day with a trace
        or more of precipitation from May 25th.  Precipitation
        totaled 5.87 inches during the period...more than a
        third of the average yearly total.
      In 1975...hail more than 2 inches in diameter fell in
        eastern Aurora.
      In ball size hail was reported 3 miles east of
        Arapahoe County Centennial Airport.  Heavy
        hail to 3/4 inch in diameter was reported in Littleton...
        Castle Rock...and Sedalia.
      In 1979...a man and a girl were struck and killed by lightning
        while walking in a park in northwest Denver.
      In 1987...3/4 inch hail fell near Boulder.
      In 1991...a microburst wind gust to 59 mph kicked up some
        blowing dust at Stapleton International Airport.
      In 1998...hail as large as 3/4 inch in diameter fell in
      In 2003...lightning struck a feeder line...knocking out the
        electricity to about 3000 residents in Littleton.  A
        lightning strike caused minor damage to the roof and attic
        of a home in Lafayette.  Another lightning strike caused
        minor roof damage to a residence in Louisville.  Yet
        another lightning strike hit a home in Denver and caused
        a small attic fire.  Hail as large as 1 inch in diameter
        was measured near Centennial Airport and near Greenland.
      In 2009...hail up to 1 inch in diameter was measured near
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.

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