Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 090045

Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUL 8 2017

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

        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.
1-18  In 1874...a streak of 18 consecutive days of 90 degrees
        tied for second with another streak that was later set
        in the summer of 1901. The record of 24 consecutive days
        was established in the summer of 2008.
1-31  In was the hottest July on record in Denver since
        weather records began in 1872.  The average temperature for
        the month was 78.9 degrees which was 4.7 degrees above
        normal. There were 27 days in which the high temperature
        equaled or exceeded 90 degrees...which established a new
        record.  There were also 7 days in which the temperature
        equaled or exceeded 100 degrees which tied the record
        set in 2005.
6-23  In 1901...a streak of 18 consecutive days of 90 degrees
        tied for second with another streak set in the summer of
        1874. The record of 24 consecutive days was established in
        the summer of 2008.
7-25  In 1934...a streak of 15 consecutive days of 90 degrees
        ranked 5th on the list of hot streaks.  The record of
        24 consecutive days was established in the summer of
9     In 1872...a very brisk wind between 2:00 PM and 3:00 PM
        spread a cloud of dust and sand into the city.
      In 1874...northeast winds at sustained speeds up to 36 mph
        blew immense clouds of dust from the prairie through the
        streets of the city around mid-morning.  The houses
        across the street from the weather station were not
        visible at the peak of the storm.
      In 1875...heavy thunderstorm rains caused stream flooding...
        which damaged nearly all railroads into the city.  Rainfall
        in the city was only 0.14 inch.
      In 1953...heavy thunderstorm rains caused an estimated
        2 million dollars damage from flooded stores and basements
        across metro Denver.  The flood waters reached a depth of
        3 feet on streets in some sections of the city...damaging
        streets and automobiles.  The heavy rainfall at Lowry Air
        Force Base totaled 3.90 inches.  At Stapleton Airport where
        the heavy rain briefly reduced the surface visibility to
        1/2 mile...only 1.05 inches of rain were measured.  North
        winds gusting to 52 mph caused some damage in east Denver.
      In 1982...two small tornadoes were spotted east of Rocky Flats...
        and a tornado touched down briefly 5 miles east of Brighton.
        No damage was reported.
      In 1984...heavy rain fell over southern sections of metro
        Denver.  Rainfall totaled 1.50 inches in just 15 minutes
        between Littleton and Sedalia.
      In 1987...a thunderstorm microburst produced a wind gust of 58
        mph at Erie north of Denver.
      In 1988...hail to 3/4 inch in diameter piled up 2 to 4 inches
        deep in Idaho Springs.  Some basements were flooded and
        several thousand gallons of fuel were contaminated when
        water flooded a gasoline storage tank.  A tornado sighted
        near Manilla 5 miles west of Bennett remained on the
        ground for 9 minutes.  No damage was reported.
      In 1990...a severe thunderstorm produced a tornado and heavy
        rain over northeast metro Denver.  As much as 4 inches of
        rain fell in just 20 minutes in Commerce City...causing the
        South Platte River to rise quickly and flood lowland areas.
        The raging flood waters caused extensive damage to a 30-foot
        stretch of railroad track embankment...destroyed a railroad
        trestle and a nearby garage...and washed away a vintage
        1960`s show car near east 58th Avenue and York Street.  The
        car was found a couple of miles downstream in a pool of deep
        mud and murky water.  Rainfall totaled 1.34 inches at
        Stapleton International Airport where 1/2 inch diameter hail
        fell.  The same thunderstorm produced a brief tornado in a
        vacant field near 64th Avenue and Tower Road just east of
        the Rocky Mountain Arsenal.  No damage was reported from the
        twister.  Lightning from the storm caused power outages to
        as many as 7 thousand homes and businesses.
      In 1996...a tornado (F0) was reported 5 miles south of Hudson.
        No damage was reported.  Twin weak tornadoes (F0) formed
        for a short time near the northeast runways at Denver
        International Airport.  Less than 15 minutes later...a weak
        tornado (F0) touched down in the employee parking lot at
        DIA.  Several car windows were blown out...and a few vehicles
        sustained minor body damage from flying debris.  Several
        signs were also blown down.  Later...twin weak tornadoes (F0)
        touched down again in open country between DIA and Watkins.
      In 2004...severe thunderstorms produced hail to 3/4 inch in
        diameter near Tiny Town and wind gusts to 66 mph in Bennett.
        A thunderstorm wind gust to 56 mph was measured at Denver
        International Airport.
      In 2005...a thunderstorm produced a wind gust to 54 mph at
        Denver International Airport.
9-10  In 1980...a series of severe thunderstorms hit metro Denver...
        dumping heavy rain and producing a spectacular lightning
        display lasting for several hours.  A number of homes were
        damaged by lightning.  Winds gusted to 60 mph at Stapleton
        International Airport where about half an inch of rain fell
        in just 10 minutes along with 1/4 inch diameter hail.  The
        evening thunderstorms continued into the early morning hours
        with total rainfall of 1.35 inches at Stapleton International
      In 1998...thunderstorm rainfall totaled 2.04 inches at the
        site of the former Stapleton International Airport.
10    In 1878...a lunar rainbow was observed during a light mist and
      In 1895...the temperature warmed to a high of only 53 degrees...
        the all-time record lowest maximum temperature for the month
        of July.
      In ball size hail damaged aircraft at Jefferson
        County Airport near Broomfield.
      In 1983...two people were injured when struck by lightning
        just southwest of Morrison.  A man was injured when he was
        swept downstream by a flash flood on a tributary of Clear
        Creek in the canyon 8 miles west of Golden.  Heavy
        thunderstorm rains caused mudslides which closed several
        roads.  Rainfall amounts included:  1.75 inches in 20
        minutes in southeast Denver...1.26 inches in 35 minutes in
        Boulder...2.14 inches in 2 hours in Lakewood...1.70 inches in
        45 minutes in Aurora...and 1.25 inches in 30 minutes atop
        Floyd Hill in the foothills west of Denver.
      In 1992...storm spotters reported 3/4 inch diameter hail
        near the construction site of the new Denver airport just
        northeast of the city.
      In 1995...microburst winds toppled a pine tree 60 feet high
        and 2 feet in diameter in Denver.  The tree fell and
        injured a man nearby.  Microburst winds to 59 mph broke the
        glass on a door at the National Weather Service Forecast
        Office at the site of the former Stapleton International
      In 1998...thunderstorm rainfall totaled 2.35 inches at
        Denver International Airport.
      In 2000...three children were critically...when
        lightning hit a nearby tree at Panorama Point atop
        Flagstaff Mountain just west of Boulder.  Lightning hit
        the tree...entered the ground...then struck the children.
        Lightning sparked a grassfire that burned about 50 acres
        at the Rocky Flats Environmental Test Facility.  Also...
        lightning sparked at least 6 fires in the Hudson and
        Keenesburg areas as thunderstorms...accompanied with heavy
        rain...large hail...and tornadoes...moved through southern
        Weld County.  Over 2 inches of very heavy rain caused
        flooding along an I-76 exit ramp near Keenesburg.  The
        fire department rescued 15 stranded motorists as high
        water inundated sections of the exit ramp and adjacent
        highway.  Basements were also flooded in Keenesburg.
        One home reportedly had 7 feet of standing water in the
        basement before the rain subsided.  A weak tornado (F0)
        touched down briefly near Brighton...but caused no damage.
      In 2001...a severe thunderstorm dumped 7/8 inch diameter
        hail in Wheat Ridge.
      In 2002...severe thunderstorms pelted the southern suburbs
        of metro Denver with large hail.  Hail as large as
        3 inches in diameter fell 6 miles southeast of Parker.
        Other large hail reports included 2 inch diameter
        hail around Centennial Airport and 3/4 inch hail near
        Sedalia and Deckers.  Hail as large as 3/4 inch was
        also reported in Broomfield.  Runoff from heavy
        thunderstorm rainfall in the Hayman Fire burn area
        flooded Lost Creek Ranch with up to 18 inches of water
        just off State Highway 126.  Floodwaters damaged a very
        expensive rug in the lodge.  A driveway to a residence
        was washed away.  In Douglas County...runoff damaged
        forest access roads in the Turkey Creek drainage.
      In 2011...a severe thunderstorm produced intense
        microburst winds in southeast Boulder County.  A peak
        wind gust to 75 mph was recorded in Superior with
        gust to 58 mph...2 miles south of Lafayette. At Denver
        International Airport...a peak wind gust of 31 mph was
11    In 1872...heavy rainfall started at 4:00 PM and continued
        into the night.  The heavy rainfall damaged homes and
        buildings in all parts of the city.  Rainfall totaled
        1.64 inches.
      In 1888...the temperature reached 100 degrees in downtown
      In 1954...the high temperature climbed to 102 degrees at
        Stapleton Airport.
      In 1970...a girl walking in a park in southeast Denver
        received eye and facial injuries when lightning struck
        nearby.  Lightning also caused numerous power outages
        and heavy rainfall produced local flooding at several
        locations across metro Denver.
      In 1974...large hail up to 1 1/2 inches in diameter fell in
      In 1990...the worst hailstorm in American history in terms of
        dollar damage at the time battered metro Denver.  Storm
        damage totaled 605 million it cut a 5-to 10-mile
        wide swath from just southeast of Estes Park to northeast of
        Colorado Springs.  Hail as large as baseballs (2.75 inches)
        pounded metro Denver.  Hardest hit areas were southeast
        Boulder County...the Jefferson County Airport in Broomfield...
        Arvada...east Wheat Ridge...southwest and south-central
        Westminster...west Thornton...northwest...west-central and
        downtown Denver...northeast and east-central Lakewood...just
        east of Littleton...portions of Arapahoe County west of I-25...
        and northern and central Douglas County near Castle Rock
        and Franktown.  Golf ball to baseball size hail severely
        damaged roofs on thousands of homes and buildings...battered
        tens of thousands of
        lights...and traffic signals...stripped paint...awnings...and
        trim from buildings...punched holes in the roofs of two homes
        in Arvada...knocked out power and telephone service to
        thousands of homes and businesses...defoliated thousands of
        trees...ripped up greens and fairways on a number of golf
        courses...and severely damaged several aircraft tied down at
        Jefferson County Airport.  Hail the size of baseballs fell
        for several minutes in Old Town Arvada. ball
        size hail and heavy rain pummeled two northwest Denver
        amusement parks.  Hardest hit was Elitch Gardens Amusement
        Park where 47 people were injured and received treatment
        for bumps...cuts...and bruises at local hospitals.  Many of the
        injured were stranded on rides during the storm when power
        failed.  Hail clogged storm sewers...causing rain water to
        back up 3 to 6 feet deep on some roads and intersections in
        Arvada.  Several basements were flooded.  In some places
        hail was washed into drifts several feet deep.  In addition...
        the storm spawned 2 small tornadoes.  One touched down
        briefly in Lakewood near 6th Avenue and Kipling Blvd....but
        did no damage.  In Castle Rock...a tornado (F1) did heavy
        damage to some homes and vehicles in the Founders Village
        development near Ridge Road.
      In 2001...lightning struck two homes in Thornton.  Most of the
        damage was confined to the attics of both homes.  Hail as
        large as 3/4 inch in diameter fell in Keenesburg...Longmont...
        and near Boulder.
11-12 In 1872...heavy rain from 4:00 PM until 2:00 AM caused much
        damage.  Rainfall totaled 1.76 inches.
12    In 1881...during the early evening...a brisk rain fell for
        30 minutes from a nearly clear sky containing not one
        tenth of clouds with the sun shining brightly.  Rainfall
        was 0.16 inch.
      In 1885...thunderstorms produced widespread lightning across
        the city during the evening.  Several people were injured
        when their homes were struck by lightning.
      In 1954...the high temperature reached 101 degrees at Stapleton
      In 1962...lightning struck and killed a Denver man...while he
        was assisting a co-worker with his car.
      In 1971...the temperature climbed to a high of 101 degrees at
        Stapleton International Airport.
      In 1974...hail to 3/4 inch in diameter fell in Castle Rock.
      In 1991...hail to 2 inches in diameter fell in Thornton with
        golf ball size hail in Brighton.  Dime size hail was
        recorded in the City of Denver.  Very heavy rain caused
        flooding across metro Denver.  Water was up to 2 feet deep
        in parts of Golden where one foot of water was reported in
        the lot of a mobile home park.  Flood water washed away part
        of a parking lot at the Colorado School of Mines in Golden.
        Heavy rain caused a rock slide and flooding along I-70 in
        the foothills just west of Denver.  Flood waters were a foot
        deep at the intersection of I-70 and I-25 just north of
        downtown Denver.  A funnel cloud was sighted just east of
        the Rocky Mountain Arsenal.
      In 1996...very heavy rainfall from a fast moving thunderstorm
        dumped 2 to 3 inches of rain within an hour over southern
        Jefferson County.  Two people were killed near the town
        of Buffalo Creek when a 20-foot wall of water flooded
        the area.  Utility poles and trees were uprooted; cars...
        propane tanks...and bridges were destroyed in the flood`s
        path.  Entire buildings were moved from their foundations
        and heavily damaged by the floodwaters.  The first fatality
        occurred along State Highway 126 when the driver of a
        pick-up truck was washed off the road by the deadly wall of
        water.  The second death occurred farther upstream when a
        man in a 5th-wheel trailer was washed away.  This was the
        second disaster to strike the area in the last couple of
        months.  The community was already recovering from a
        wildfire which burned about 12 thousand acres of forest land
        in late May.  With the forest burned by fire...very little
        vegetation was available to slow the storm`s runoff...which
        resulted in the flash flood.  Power...water...and sewer
        service were heavily damaged in the flood some
        cases...beyond repair.  The cost of repairing the roads and
        water system in the area was estimated at around a half
        million dollars.  Elsewhere across metro Denver...severe
        thunderstorms produced hail...damaging winds...and small
        tornadoes.  Weak tornadoes (F0) were reported in Broomfield...
        3 miles east of Englewood...and in Dacono.  No damage was
        reported...except a trampoline was blown into a window and
        several trees were downed in Broomfield.  Thunderstorm
        wind gusts estimated as high as 60 mph blew a fence down
        in Louisville where winds also toppled a tree near a house.
        The house received only minor damage.  Large hail...strong
        winds and heavy rain caused substantial property damage
        in portions of southeastern Boulder and northern Jefferson
        counties.  Damage estimates in the Broomfield area alone
        were about 1 million dollars.  Winds gusted to 81 mph in
        Broomfield.  Large hail...3/4 to 1 1/2 inches in diameter
        fell in Evergreen...Lakewood...Englewood...Broomfield...near
        Morrison...northeast of Boulder...and just east of Denver
        International Airport.
      In 2000...heavy rain fell across a portion of the Hi Meadow
        Fire burn area near Buffalo Creek...causing localized
        flooding.  About 3/4 inch of rain fell in 30 minutes over
        Miller Gulch.  Some culverts become plugged by debris from
        the fire.  As a result...small sections of a U.S. Forest
        Service road along Miller Creek were washed out.  Lightning
        struck a home in Castle Rock...causing extensive damage to
        the roof...attic...and second floor.
      In 2011...severe thunderstorms developed over parts of Adams
        and Denver Counties. At Denver International Airport...a
        severe thunderstorm produced a peak wind gust to 66 mph...
        with another gust to 59 mph measured in Denver.  In
        Commerce City...the intense winds blew down a large tree.
13    In 1902...west winds were sustained to 42 mph with gusts to
        48 mph.
      In apparent dry microburst produced northeast winds
        sustained to 41 mph.
      In 1961...hail as large as 1 inch in diameter was reported
        near Commerce City.
      In 1982...a tornado touched down briefly south of Parker.  No
        damage was reported.
      In 1985...thunderstorms drenched the Highlands Ranch area of
        northern Douglas County with 1.50 inches of rain in just
        30 minutes.  Half an inch of rain fell in 15 minutes in
      In 1986...a lightning bolt struck a church steeple in
        Littleton...toppling it to the ground.
      In 1989...thunderstorm winds blew down trees and bent a metal
        basketball fixture just north of Castle Rock in the Surrey
        Ridge area.
      In 1993...1 inch diameter hail was measured in Lakewood.
      In 1995...lightning struck and injured an assistant coach
        during a baseball game at Highlands Ranch south of Denver.
      In 1996...3/4 inch diameter hail fell in Lochbuie with 1 1/2
        inch hail measured in Brighton.  Thunderstorm winds gusted
        to 69 mph at Bennett.  The strong winds were responsible
        for flipping three semi-trailer trucks onto their sides
        along I-70...3 miles east of Bennett.  A few cars were also
      In 2001...heavy thunderstorm rain caused flash flooding over
        south metro Denver.  Three inches of rain reportedly fell
        near the Greenwood Village Police Department in the span
        of 15 minutes.  The heavy rain caused Toll Gate Creek to
        overflow...flooding low lying areas along Parker Road.
        Heavy rainfall also caused local flooding along streets
        near the Denver Technology Center.  A severe thunderstorm
        dumped hail to 1 3/4 inches in diameter near Castle Rock.
      In 2003...maximum temperature of 100 degrees was a record high
        for the date.
      In 2009...severe thunderstorms produced wind gusts to 70 mph
        near Parker and Strasburg.  At Denver International
        Airport...west-northwest winds gusted to 40 mph.
      In 2011...severe thunderstorms produced extensive damage as
        they moved across the Urban Corridor. At Denver
        International Airport alone...large hail up to golfball
        size...very heavy rain and wind gusts to 59 mph caused
        substantial damage to 40 planes and stranded approximately
        1500 passengers overnight. Frontier and United Airlines
        were hardest hit as dozens of planes were taken out of
        service for repairs; forcing the cancellation of at least
        220 flights over the next several days. Damage to the
        aircrafts alone was nearly five million dollars. In
        addition...83 cars in airport parking lots were damaged...
        along with some police cars and maintenance vehicles. In
        Watkins...two people suffered minor injuries and 35 to 40
        homes were damaged. As many as two hundred residents in a
        mobile home park were left homeless by the storm...forcing
        the Red Cross to open a shelter at Bennett High School.
        The trailer park contained 52 mobile homes...14 recreational
        vehicles...3 houses and a commercial building. Hailstones
        the size of softballs cratered the north sides of the
        mobile homes. Some farmers in the area said they lost as
        much as 85 percent of their total wheat crop. Power lines
        were also damaged which affected about 1200 customers in
        Watkins. The strong winds also flipped over a tractor-
        trailer rig on I-70 near Watkins Road. Insurance claims for
        the Watkins...Bennett and Brighton areas was estimated to be
        seventeen million dollars. The total damage estimate across
        the entire Urban Corridor...was near one hundred sixty five
        million dollars...and included 17200 automobile claims and
        12600 homeowner claims. In addition...thunderstorms
        producing very heavy rainfall...caused flash flooding in the
        Four Mile Canyon burn scar west of Boulder. Three homes
        reportedly had water up to the windows with water flowing
        into structures at Fourmile Canyon Road and Gold Run Road.
        The heavy rain caused a 4-ft surge along Fourmile Creek
        through Orodell and into the entry of Boulder Creek.
        Several roads were affected which restricted access to the
        area. Roads were closed due to water and debris. Private
        bridges and drives were washed out and several residents
        were stranded and later rescued. Numerous cars were damaged
        in debris flows and several structures suffered flood
        damage but were not destroyed.
13-5  In 2008...a streak of 24 consecutive days of 90 degrees
        shattered the previous record of 18 consecutive days
        established in 1901 and 1874. new single
        day record high temperatures were set in the month of July.
        In August however...a record of 104 degrees was set on the
        1st...and another record of 103 degrees was set on the 2nd.
        In addition...a record low min of 70 degrees was set on
        August 2nd.
14    In 1878...the temperature reached a high of 100 degrees in
        downtown Denver.
      In 1906...a thunderstorm produced north winds sustained to
        52 mph and 0.53 inch of rain in 10 minutes.
      In 1912...a heavy thunderstorm cloudburst in the late afternoon
        combined with a similar storm to the south of the city to
        produce widespread flooding on Cherry Creek in downtown
        Denver...which resulted in two deaths and several injuries.
        The flooding was the worst since 1864 and covered around 3
        square miles of lower downtown.  Bridges along Cherry Creek
        were washed out and water lapped at the floor of the Broadway
        bridge over the South Platte River...causing authorities to
        declare it unsafe except for pedestrians.  By nightfall...
        Union Depot was under 2 to 3 feet of water...and railroad and
        street car traffic was stalled.  Those forced from their
        homes by the surging flood waters took refuge in the Denver
        Auditorium.  The flood waters caused great damage to the
        sewerage system...parkways...bridges and residences and
        commercial warehouses near Cherry Creek in the wholesale
        district.  Flood damage was estimated at several million
        dollars.  Heavy thunderstorm rainfall of 2.00 inches...of
        which nearly 1.75 inch fell in 30 minutes in central Denver...
        was accompanied by severe thunderstorm winds sustained to 55
        mph with gusts as high as 74 mph.
      In 1933...thunderstorm rainfall was only 0.01 inch...but
        northwest winds sustained to 37 mph with gusts to 47 mph
        produced a dust storm for about 10 minutes during the
        late afternoon.
      In 1967...heavy rain flooded areas of north and west metro
        Denver...and high water closed street intersections in the
        city.  Crops were damaged...and 200 chickens drowned by
        flooding northwest of Denver where farm buildings and
        irrigation facilities were also damaged.
      In 1969...a thunderstorm wind gust to 51 mph was recorded at
        Stapleton International Airport.
      In 1975...heavy rains caused locally heavy flash flooding along
        Niver Creek south of Thornton and in other parts of north
        metro Denver.  Over 40 thousand dollars in damage to public
        property was reported...and numerous homes and yards were
      In 1986...thunderstorm winds blew down a power line in west-
        central Jefferson County.  The it moved into
        Denver...snapped tree limbs and damaged a fence near
        Washington Park.  Wind gusts in the area were estimated at
        80 to 85 mph.
      In 1990...thunderstorm wind gusts to 58 mph were recorded at
        Buckley Field in Aurora.  No damage was reported.  Winds
        gusted to 44 mph at Stapleton International Airport.
      In 1993...a severe thunderstorm moved across southern sections
        of metro Denver.  Dime size hail fell in Lakewood...and hail
        up to one inch diameter was measured at Cherry Creek
        Reservoir.  Later in the afternoon...hail to one inch
        diameter fell in Golden and Arvada.
      In 1994...hail to 1 1/4 inches in diameter fell north of
      In 1998...dry microburst winds estimated to 70 mph snapped
        tree branches up to 4 inches in diameter in Brighton
        where some road signs were twisted and blown down.  At
        Denver International Airport...dry microburst winds gusted
        to 61 mph.
      In 1995...thunderstorm winds gusted to 62 mph near Strasburg.
      In 2001...a severe thunderstorm dumped hail to 3/4 inch in
        diameter in the foothills about 10 miles northwest of
      In 2011...severe thunderstorms in the Denver metropolitan
        area produced very heavy rain...large hail and damaging
        winds. The strong winds toppled a few trees and the heavy
        rain caused street flooding and minor flash flooding.
        Several cars were stranded at the intersection of Santa Fe
        Drive and Oxford...and near Broadway and U.S. Highway 285.
        A 16-yr old teenager was seriously injured when he tried
        to retrieve a ball along the banks of West Toll Gate Creek.
        He was pulled from the swollen creek and died several days
        later. Hail up to one inch in diameter was reported
        around the area. The thunderstorms also produced frequent
        lightning. One strike sparked a fire at Aspen Academy...a
        private school in Greenwood Village. Most of the damage
        was confined to the roof and attic. In Englewood...a
        40-ft tree was blown into a house and knocked down some
        power lines.  At Denver International Airport...a severe
        thunderstorm produced sustained winds of 47 mph and a
        peak wind gust to 68 mph.
14-15 In 1985...thunderstorms dumped heavy rain and hail at numerous
        locations along the Front Range from Denver north.  Some of
        the heaviest rain fell in northern and western suburbs of
        Denver.  Up to 2.6 inches of rain drenched Arvada...and
        Thornton was soaked with 2 inches in 45 minutes.  At least
        5 homes in Arvada suffered extensive damage from water and
        mud...and many streets and basements were flooded.  In
        southern Jefferson county...11 homes were struck by
15    In 1879...a terrific hail storm occurred in the vicinity of
        of Buffalo Station on the South Park Railroad in the
        South Platte River canyon about 39 miles south of Denver.
        Stones as large as hen`s eggs fell thick and fast and broke
        nearly every pane of glass in the windows of the building.
        A "waterspout" or cloudburst caused much loss of property
        from flash flooding on a nearby gulch.  The torrent of
        water caused a deafening roar as it uprooted trees and
        carried huge boulders and other debris.  It struck the
        house and sawmill simultaneously and carried them away
        like straws...leaving little behind.  The water continued
        to rush down the gulch for several hours.  Serious damage
        was done to the South Park Railroad.  The track and
        roadbed were destroyed for several miles.  At about the
        same time...heavy rains in the vicinity of the headwaters
        of Cherry Creek produced a rapid rise in the creek...which
        drowned a few head of cattle and washed away two footbridges
        and some fences.  Only 0.10 inch of rainfall was recorded in
      In 1896...a thundestorm produced sustained southwest winds to
        40 mph with gusts to 46 mph.
      In 1902...the temperature reached a high of 100 degrees in
        downtown Denver...which was a record maximum for the date.
      In 1929...a thunderstorm did considerable damage to property
        in the eastern portion of the city.  Heavy hail ranging
        in size from 1/4 to 3/4 inch in diameter...severe lightning...
        and high winds accompanied the heavy rain.  Basements were
        flooded...and streets were impassable in places for several
        hours due to the heavy rainfall.  Lightning damaged several
        telephone poles.  Hail did extensive damage to gardens and
        flowers.  The hail was up to a foot deep in places.  There
        was no estimate of damage from the storm.  A thunderstorm
        produced only a trace of rain and east winds to 24 mph in
        downtown Denver.
      In 1959...thunderstorm rain totaled 0.41 inch in 8 minutes
        and winds gusted to an estimated 50 mph near downtown
        Aurora where half inch diameter hail was also reported.
        After the storm moved to the east...complete double rainbows
        were observed from the Weather Bureau office at Stapleton
      In 1962...hail pelted the area in Adams County around Henderson
        and Brighton...causing extensive damage to corn...grain...
        beets...and row crops.  Crop damage was estimated at 250
        thousand dollars.
      In 1963...a man received severe burns when struck by lightning
        while painting a building in south Denver.
      In 1965...a State Patrolman sighted a tornado near Bennett.  It
        touched down over open ground...but caused no damage.
      In 1967...heavy rains flooded streets and underpasses in south
        Denver.  Heavy rain and minor wind damage were reported in
        Wheat Ridge...Aurora...Englewood...and Littleton.  Basements
        were flooded and power disrupted.  The clouds and rain
        resulted in a high temperature of only 72 degrees...which
        was a record low maximum for the date.
      In 1974...a severe lightning storm damaged several homes and
        caused a number of power outages in both Denver and western
        Arapahoe counties.
      In 1975...lightning killed a girl west of Boulder.
      In 1982...winds gusted to 60 mph at Stapleton International
        Airport...and strong winds blew down walls at a construction
        site in Aurora where a nearby tree was uprooted.
      In 1985...0.79 inch of rain fell in 30 minutes at Castle
        Rock.  Much of the town lost power when lightning struck
        the town`s transformer.
      In 1992...a man was struck by lightning while horseback riding
        near Castle Rock.  Two people were struck by lightning near
        Highlands Ranch in south metro Denver.  A man was struck by
        lightning while riding in the back of a pick-up truck in
        Franktown.  All received minor injuries.  Strong
        thunderstorms moved through east metro Denver...producing
        large hail and flash flooding.  Hail up to 1 1/4 inches in
        diameter fell near Buckley Air National Guard Base.
        Rainfall of 1 to 3 inches fell in Aurora in less than an
        hour...leaving water up to 18 inches deep in some areas.
        Thunderstorm rainfall was measured at 0.97 inch at
        Stapleton International Airport...where 3/8th inch diameter
        hail fell and south winds gusted to 44 mph.
      In 1993...dime size hail fell in Golden.  National Weather
        Service observers at Stapleton International Airport
        sighted a small rope-like funnel overhead for about 3
        minutes before it dissipated.
      In 1994...a small...short-lived tornado caused damage to a house
        under construction in Parker.
      In 1995...thunderstorm winds of unknown strength downed trees
        and branches...damaging a porch and nearby cars in Denver.
      In 1998...hail to 7/8 inch in diameter fell near Keenesburg.
      In 2000...this date marked the end of a near record hot streak
        for metro Denver.  The high temperature at Denver
        International Airport equaled or exceeded the 90-degree
        mark for 17 consecutive days...from June 29th.  This was
        one day short of equaling the all time record.  The
        record of 18 consecutive days was set in two different
        years...July 1st-18th...1874 and July 6th-23rd...1901.
      In 2005...severe thunderstorms produced large hail over
        southeast metro Denver.  Hail as large as 1.75 inches
        in diameter fell in southwest Aurora along with 7/8 inch
        hail in Centennial.  Hail to 3/4 inch in diameter was
        measured near Centennial Airport and near Watkins.
15-16 In 2006...a brief mid July hot spell resulted in two 100
        plus degree high temperatures and two daily maximum
        temperature records.  The high temperature climbed to
        101 degrees on the 15th and 103 degrees on the 16th
        at Denver International Airport.

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