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 JUL 30 2016

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

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.   Ironically...no 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.
18-2  In 1987...a streak of 16 consecutive days of 90 degrees
        ranked 4th on the list of hot streaks.  The record of
        24 consecutive days was established in the summer of
        2008.
27-31 In 1956...96 percent of the total precipitation for the month
        of July occurred over the last five days of the month.
        Heavy thunderstorms produced 4.00 inches of rainfall at
        Stapleton Airport.  This amount of precipitation in 5 days
        or less had been exceeded only 3 times in previous record.
        The last time had been in December of 1913 as snow.
        Considerable property damage occurred across metro Denver
        from flooding.
31    In 1873...the all-time lowest recorded temperature in July...
        42 degrees...occurred.  The same temperature also occurred
        on July 4...1903.
      In 1874...during the late afternoon rain and hail fell for
        5 minutes followed by brief heavy rain.  Pieces of solid
        ice of irregular shape fell upon the roof of the station.
        The hail stones measured 1 1/2 inches in diameter.
        Precipitation (rain and melted hail) was only 0.16 inch.
      In 1889...the high temperature climbed to 100 degrees in
        downtown Denver.
      In 1919...heavy thunderstorm rainfall totaled 2.59 inches in
        downtown Denver during the evening.  Rainfall was 1.90
        inches in an hour...a new record at that time.
      In 1961...over an inch of rain in a short period of time caused
        flooding of streets and basements in Denver.  Rainfall
        totaled 1.30 inches at 11th and Lincoln in central Denver.
      In 1964...the temperature reached 91 degrees in Denver...making
        this the 27th day of the month that the temperature reached
        90 degrees or more.  This is the all time record for 90
        degree days in a month in Denver.
      In 1972...one inch diameter hail fell in Hudson northeast of
        Denver.
      In 1976...during the evening hours extremely heavy thunderstorm
        rains produced flash flooding in Big Thompson Canyon which
        killed 144 people between Estes Park and Loveland.  No
        significant weather occurred in metro Denver at the time.
      In 1987...1 inch diameter hail fell in Lakewood and 3/4 inch
        hail fell near Louisville.  Southeast Boulder County was
        drenched with 1.25 inches of rain in just 20 minutes.
      In 1993...thunderstorm winds damaged a chimney of a home near
        Parker.
      In 1996...a weak tornado (F0) was sighted 12 miles east of
        Denver International Airport.  No damage was reported.
      In 1998...heavy monsoonal thunderstorm rain triggered a mud
        slide in Blackhawk.  The mudslide blocked Main St. and
        caused an estimated half million dollars in damage to a
        casino.  Heavy thunderstorm rain...up to 3 inches in an
        hour...caused a flash flood along Buffalo Creek.  Portions
        of County Road 126 just south of the town of Buffalo
        Creek were washed out.  The flood waters nearly washed
        away the bridge as mud and debris slammed into the
        structure.  Hail to 1 3/4 inches in diameter fell near
        Idaho Springs.
      In 2004...severe thunderstorm winds toppled a 65-foot blue
        spruce tree in Parker.  The tree landed on a home damaging
        the roof and gutters.  The downed tree poked dozens of holes
        into the shingles.
      In 2013...severe thunderstorm winds...with gusts estimated to 80
        mph...downed power poles which caused scattered outages in and
        around Byers...Bennett and Strasburg. Some property damage was
        also observed. Near Byers...aluminum siding and roofing was
        peeled off sheds. Large hail...up to one inch in diameter...was
        reported north of Bennett.  At Denver International Airport...
        a peak wind gust to 40 mph was observed from the northeast.
1     In 1888...heavy rain in the mountains and foothills caused
        flooding on Clear Creek in Golden.  The high waters also
        washed away portions of the railroad tracks in the canyon
        between Idaho Springs and Golden.
      In 1901...the temperature reached a high of 100 degrees in
        the city.
      In 1902...the high temperature climbed to 100 degrees in
        downtown Denver.
      In 1914...a thunderstorm produced 1.00 inch of rainfall in
        just 21 minutes and north winds sustained at 43 mph with
        gusts to 50 mph.  Rainfall totaled 1.17 inches.
      In 1938...the temperature climbed to a high of 100 degrees
        in downtown Denver...which is the record maximum for the
        date.  The temperature was also recorded on this date in
        previous years.
      In 1976...flight operations at Stapleton International Airport
        were suspended for 90 minutes when the airport tower radar
        was knocked out and water reached a foot deep on some taxi
        ramps after 1.50 inches of rain fell in one hour.  Heavy
        rain also caused minor flooding in east Denver and Aurora
        where lightning damaged the roof of a home and injured the
        owner.  One young man was swept down a flooded ditch...but
        was rescued by firemen.  A number of rafts were floated in
        flooded streets.  Thunderstorm rainfall totaled 1.71 inches
        at Stapleton International Airport.
      In 1978...a tornado damaged a house and broke a power pole
        5 miles northwest of Parker.  A microburst wind gust to
        52 mph briefly reduced visibility to 1 mile in blowing
        dust at Stapleton International Airport.
      In 1985...heavy thunderstorms roared through the southern and
        western sections of metro Denver...producing large hail
        and heavy rain.  Lightning hit a recreational vehicle
        trailer causing it to burn.  There was a lot of street
        flooding over western suburbs where rainfall totaled
        over 2 inches in some areas.  One inch diameter hail was
        reported in Littleton and near Evergreen.  Hail piled 4
        to 6 inches deep at Tinytown in the foothills southwest
        of Denver.
      In 1990...a small rope-like tornado was spotted in open
        country 15 miles southeast of Centennial Airport.
        No damage was reported from the twister.
      In 1992...pilots reported a funnel cloud near the
        construction site of the new Denver International
        Airport.  A few minutes later...a tornado was reported
        near Bennett.  The tornado remained on the ground for
        about 18 minutes and was visible from the National
        Weather Service office at Stapleton International
        Airport.  Thunderstorm wind gusts to 70 mph were
        reported near Bennett and Watkins with a wind gust
        to 60 mph at Brighton.  Two men were injured when
        struck by lightning.  A young man sustained serious
        injuries when struck by lightning while jet skiing on
        Cherry Creek Reservoir.  A man received only minor
        injuries when struck by lightning while golfing in
        Westminster.
      In 1994...heavy thunderstorm rains in the foothills west
        of Denver caused the closure of the Virginia Canyon
        road north of Idaho Springs by rocks and debris.
      In 2001...a 34 year old man on the South Platte River bike
        path in Denver received minor injuries when lightning
        struck a nearby tree.  Lightning...coupled with strong
        thunderstorm winds...knocked out electrical power to
        about 10 thousand homes and businesses in Golden.
      In 2006...strong thunderstorms hit southern metro Denver.
        A severe thunderstorm wind gust estimated to 71 mph
        knocked down a tree in Aurora near Cherry Creek.
        Lightning sparked a fire in a home near Lone Tree and
        struck a transformer at an RTD Light Rail station at
        Interstate 25 and Yosemite Street.  Heavy thunderstorm
        rainfall forced the closure of Arapahoe Road between
        Holly and Quebec streets due to high water.  Flooding
        was also reported near Park Meadows Mall and Greenwood
        Village.  Heavy rainfall also caused flooding in
        Highlands Ranch...Lone Tree...and Parker.  Water up to
        6 inches deep was reportedly running over the roads.
2     In 1878...the high temperature reached 100 degrees in
        downtown Denver.
      In 1911...an apparent dry microburst produced sustained
        west winds to 42 mph.
      In 1972...one workman was killed and another injured when
        a strong gust of wind destroyed a partially completed
        apartment building in south Denver.  Hail to 1 3/4 inch
        diameter fell in Golden.
      In 1973...hail to 3/4 inch diameter was reported in Boulder.
      In 1986...a major outbreak of severe thunderstorms occurred
        along the Front Range.  Thunderstorms developed
        explosively.  Some places were hit by large hail twice.
        Two inch diameter hail broke car windows on I-25 west of
        Brighton...and up to 1 1/4 inch hail broke windows in
        Thornton.  Baseball size hail damaged several planes near
        Watkins.  Funnel clouds were sighted around Aurora.  Hail
        over 1/2 inch in diameter covered the ground 3 to 4 inches
        deep at Hudson northeast of Denver.  Most of the hail fell
        north of metro Denver...but 3/4 inch diameter hail was
        measured at Stapleton International Airport.  Total damage
        from the hail storms this day was estimated at over
        10 million dollars.
      In 1991...late afternoon thunderstorms produced heavy rain
        across metro Denver.  Two feet of water covered parts of
        I-25 in southeast Denver...while one foot of water covered
        parts of U.S. Highway 285 in Englewood.  Thunderstorm
        rainfall totaled 0.50 inch at Stapleton International
        Airport.
      In 2001...severe thunderstorms producing heavy rain and hail...
        either washed out or damaged several county roads in the
        Watkins and Bennett areas.  A small tornado (F0) touched
        down near Bennett...but did no damage.  Hail as large as
        1 3/4 inches in diameter fell near Watkins.  One inch
        diameter hail was measured near Hudson and Keenesburg.
      In 2008...strong winds blew several trees down in Denver...
        damaging homes and downing power lines.  A peak wind gust
        of 67 mph occurred at Centenniel Airport...with gusts to 60
        mph estimated in Denver.  A peak wind gust of 37 mph was
        measured at Denver International Airport.  An elderly man
        was killed when a wind damaged tree broke free and crushed
        him while he attempted to remove it.  The downed power
        lines caused outages to about 500 Xcel Energy customers.
2-3   In 1876...grasshoppers were in great abundance in the city
        and caused considerable damage to gardens and to crops
        in the surrounding farms and ranches.
      In 1951...heavy thunderstorms rumbled across metro Denver
        through the night.  Heavy rain totaled 3.45 inches at
        Stapleton Airport.  This was the greatest 24 hour
        precipitation ever recorded during the month of August
        in Denver.
      In 2007...Heavy rain caused localized flash flooding near
        Ft. Lupton.  Up to 8 inches of water was reported across
        County Road 18.  In addition...several other county roads
        in the immediate area were washed out.
3     In 1878...the high temperature climbed to 100 degrees in
        downtown Denver.
      In 1900...a thunderstorm produced west winds sustained to
        48 mph with gusts to 55 mph...but only a trace of rain.
      In 1903...a thunderstorm produced a trace of rainfall and
        northwest winds sustained to 45 mph with gusts to 60 mph.
        The high temperature was 99 degrees.
      In 1927...a thunderstorm produced hail and sustained north
        winds to 22 mph.
      In 1933...heavy cloudburst rains caused the failure of the
        Castlewood Dam...which resulted in flash flooding on Cherry
        Creek...the deaths of 7 people in Denver...and flood damage
        estimated at 1 million dollars.  Lower Denver was flooded
        during the morning by waters pouring down Cherry Creek
        and its valley from Castlewood Dam...which had broken
        between midnight and 2:00 AM.  Heavy rain of 3 to 9 inches
        in 9 hours in the watershed above the dam resulted in the
        failure.  At 7:30 AM...the flow in Cherry Creek was reported
        at 16 thousand second-feet as compared with a peak flow of
        3 thousand second-feet in other years.  The flood waters
        ruined hundreds of acres of crops and drowned scores of
        farm animals.  Six bridges in Denver were swept away.
        Great deposits of mud were left in the lower sections of
        the city...including hundreds of basements and lower floors
        of buildings.  At the end of the month...a deadly stench
        still rose from swampy areas near the lower city limits.
      In 1963...heavy thunderstorm rains in the Parker area caused
        Cherry Creek to overflow...which damaged roads.
      In 1985...a tornado touched down briefly about 10 miles
        northeast of Parker.  No damage was reported.
      In 1991...upslope northeast winds produced chilly temperature
        readings and heavy rain across metro Denver.  Rainfall...
        with no thunder...totaled 1.56 inches at Stapleton
        International Airport where the heavy rain briefly reduced
        the surface visibility to 7/8 mile.  The mercury climbed to
        a high of only 63 degrees.
      In 1992...a thunderstorm wind gust to 64 mph was recorded in
        Brighton.  A wind gust to 60 mph was measured near the
        construction site of the new Denver International Airport.
        Lightning started a fire in an Evergreen church...causing
        over 75 thousand dollars in damage.
      In 1998...3/4 inch hail fell in Jefferson County 15 miles
        northwest of Arvada.
      In 2006...heavy thunderstorm rainfall caused flash flooding
        along Leyden Creek in unincorporated Jefferson County.
        An automated rain gauge on upper Leyden Creek...6 miles
        northwest of Arvada...measured 2.68 inches of rainfall in
        less than 2 hours.  Two to three feet of water covered the
        roadway at the intersection of 82nd and Quaker Street.
      In 2009...a woman riding her bike...in training for an Ironman
        Triatholon...was struck by lightning in Boulder.  She was in
        the 78th mile of a 100-mile training ride when she was
        hit.  The woman lost her vision initially and couldn`t
        move her arms.  After a short stay in the hospital...she
        made of complete recovery.
      In 2013...severe wet microburst thunderstorms produced
        damaging winds and very heavy rain in and around Buckley
        Air Force Base...Erie and Lafayette. Peak gusts included:
        68 mph in Erie...61 mph at Buckley AFB...and 60 mph in
        Broomfield...4 miles east-southeast of Erie and Lafayette.
        In Erie...a velodrom under construction was heavily damaged
        by heavy rain and high winds.  The wind toppled the eastern
        third of the 250-meter cycling track. Bolts measuring
        one-half-inch thick by 7 1/2 inches in length were ripped out
        of concrete footers while 16-inch-wide trusses...collapsed
        under the force of the wind. In town...heavy rain...around
        2.5 inches in less than one hour...caused extensive street
        flooding.  The intense wind also downed trees which resulted
        in localized power outages. In addition...an empty semi-trailer
        was blown on its side.  A weak non supercell tornado touched
        down briefly in an open field...7 miles northwest of Hudson.
        The storm forced seven incoming flights at Denver
        International Airport to be diverted and contributed to
        45-minute delays for others.  At Denver International
        Airport...a peak wind gust of 55 mph was observed from the
        northeast...with 0.66 inches of rainfall recorded.  The very
        heavy rain produced flash flooding in part of Aurora.  Road
        closures were set up in both directions on both Picadilly Road
        and Gun Club Road...just north of Buckley AFB. A man had to be
        rescued when his car was trapped in flood waters at the
        intersection of 6th Ave. and Picadilly Road. Flash Flooding
        was also observed at the junction of E-470 and I-70 with water
        running over the road.
3-4   In 1988...two inches of rain fell in 3 hours at both Morrison
        and Wheat Ridge.  Thunderstorm rainfall totaled 0.80
        inch overnight at Stapleton International Airport.
4     In 1889...southwest winds were sustained to 42 mph with
        an extreme velocity to 52 mph.
      In 1924...0.01 inch of rain fell over downtown Denver.  This
        along with the 0.01 inch of rainfall on the 10th was the
        only rainfall of the month...the driest August on record.
      In 1963...heavy rains in the foothills above Idaho Springs
        caused mud and rock slides which closed U.S. Highways 6
        and 40 for a time.
      In 1976...hail to 1 inch diameter was reported 12 miles
        southwest of Denver.  Hail to 3/4 inch in diameter was
        reported in Lakewood.  Small hail...1/4 to 1/2 inch in
        diameter...fell at Stapleton International Airport.
      In 1982...heavy rain poured through the roof of a clothing
        store in Aurora...causing widespread water damage.  The roof
        was being repaired when the storm hit.
      In 1983...hail up to one inch in diameter fell in Aurora
        where heavy rain produced street flooding.
      In 1984...a Colorado State Trooper was struck and injured by
        lightning in Northglenn.
      In 1989...a microburst wind gust to 52 mph was recorded at
        Stapleton International Airport.
      In 1997...lightning sparked a small fire in a home in Arvada...
        causing minor damage.  Several intersections in both Arvada
        and Westminster were flooded by thunderstorms producing
        heavy rain.  Several cars were damaged by the high waters...
        and a number of businesses were flooded.
      In 1999...flooding and flash flooding problems developed over
        metro Denver as slow moving thunderstorms dumped from 2 to
        3.5 inches of rainfall in about 3 hours.  Near the junction
        of I-25 and U.S. Highway 36...up to 4 feet of water flooded
        an auto dealership.  About 45 cars were ruined.  Damage
        estimates to the dealership alone totaled nearly a half
        million dollars.  Sections of I-25 and U.S. 36 near the
        interchange were closed due to floodwaters.  Floodwaters...
        up to 5 feet deep...forced the evacuation of two mobile
        home parks in Federal Heights.  Railroad tracks were
        washed out near Federal Blvd. and 64th Avenue.  Numerous
        power outages caused widespread blackouts in Thornton and
        Littleton.  Along Massey Draw near Carr St. and Chatfield
        Reservoir...4 homes were flood damaged and portions of their
        backyards washed out.  Widespread street flooding was also
        reported in Boulder where several buildings were flood
        damaged...including the University of Colorado Memorial
        Center.
      In 2004...two golfers were shocked when lightning struck the
        eighth green of the golf course at Castle Pines north of
        Castle Rock.  The two men suffered only minor injuries.
        Heavy thunderstorm rain from the same storm caused flash
        flooding.  Floodwaters rushed across parts of U.S. Highway
        85 near the entrance to the Castle Pines Golf Club.  The
        traffic lanes were covered with up to 6 inches of running
        water.
      In 2008...lightning sparked a grassfire that consumed 300
        acres on the northern edge of Green Mountain...in Jefferson
        County.  Gusty winds and very dry conditions allowed the
        wildfire to quickly spread and threaten several houses.
        Fortunately...only minor damage was reported to homes due
        to smoke and melted siding.
5     In 1881...the low temperature cooled to only 76 degrees...the
        record high minimum temperature for the month.
      In 1889...southwest winds were sustained to 42 mph.
      In 1918...hail pelted the city...but was light and caused no
        damage.  Precipitation totaled 0.25 inch.  Northwest winds
        were sustained to 31 mph.
      In 1964...lightning struck two boys in Denver while playing
        ball.  One was treated and released from the hospital...but
        the other boy suffered second degree electrical shock and
        cardiac arrest and was hospitalized in critical condition
        for several days.
      In 1969...two tornadoes touched down briefly in an open field
        southeast of Buckley Field in Aurora.  No damage was
        reported.
      In 1970...heavy rain in the Indian Hills area in the
        foothills west of Denver caused flash flooding...which
        washed out roads and damaged other property.  Hail
        accumulated to a 3 inch depth with stones up to golf ball
        size; however...most of the damage was from flooding.
      In 1982...2.38 inches of rain fell in an hour in Arvada...
        causing minor flooding on Ralston Creek.  In Westminster...
        1 1/2 inches of rain fell...causing damage to streets and
        culverts.  In addition...lightning caused some minor power
        outages across metro Denver.
      In 1983...very heavy thunderstorms hit the southern portion of
        metro Denver.  Heavy rainfall...as much as 2.89 inches in 38
        minutes...caused widespread street flooding in southeast
        Denver.  Two feet of water covered a section of I-25.  Hail
        up to golf ball size accompanied the storm in Littleton and
        Englewood...along with 60 mph winds.
      In 1984...a heavy thunderstorm drenched Littleton with up to
        2.35 inches of rain in an hour...along with small hail that
        piled up to 2 inches deep.  Flood waters were up to 4 feet
        deep in parts of town with many basements flooded.  There
        were some power outages caused by lightning.
      In 1990...a thunderstorm dumped 1.25 inches of rain in 12
        minutes near Tower and Smoky Hill Roads in southeast
        Aurora.  Minor street flooding was reported in the area.
      In 1992...a pilot reported two funnel clouds near Cherry Creek
        Reservoir.  Both dissipated quickly.  Dime size hail fell
        near Franktown.
      In 1994...one inch diameter hail fell near Strasburg.  No
        damage was reported.
      In 1999...a dog kennel east of Denver International Airport...
        was flooded when a small dam...upstream in Elbert County...
        was breached.  The floodwaters...up to 4 feet deep...washed
        away some 6-foot fences and other small buildings.  Ten of
        the 70 dogs boarded at the kennel drowned.
      In 2002...a mail carrier was struck by lightning as he
        inserted a key into a multi-unit mailbox in Bailey.
        The shock knocked the man back against the mail truck.
        He suffered minor injuries.  Lightning struck a residence
        in Commerce City.  The resulting fire destroyed the roof
        of a detached garage and damaged much of its contents.
        Hail as large as 1 3/4 inches in diameter pelted Pine.
        One inch diameter hail fell in Arvada and southwest Denver.
        Heavy rain triggered a mudslide along U.S. Highway 285
        near Bailey.  Both lanes of traffic had to be closed
        until debris could be removed from the highway.  Several
        residences in the Bailey and Glenisle areas were also
        flooded.
      In 2004...heavy thunderstorm rainfall caused localized flash
        flooding in Virginia Canyon near Idaho Springs.  Sections
        of the Virginia Canyon Road had to be closed due to the
        floodwaters.
      In 2008...a severe thunderstorm produced large hail...up to
        1 1/4 inches in diameter...northeast of Parker.  Several
        automobiles were damaged.
6     In 1877...a severe rain...hail...and wind storm struck Denver.
        The storm produced a one minute sustained wind speed of
        75 mph.  Rainfall totaled 1.00 inch in 25 minutes.  The
        hail storm damaged vegetable gardens in the city.
      In 1954...an unconfirmed tornado was reported in Westminster.
        A funnel cloud was sighted in the area...but it was not
        certain if it had touched down.  No damage was reported.
      In 1980...the temperature reached 100 degrees...setting a new
        record high for the date.
      In 1982...3/4 inch diameter hail was reported in north Denver.
        Heavy rain caused street flooding in central Denver where
        4 to 5 feet of water inundated I-25...closing the freeway
        for a while.  Rainfall across metro Denver ranged up to
        2.35 inches in just over an hour.  An estimated 2000
        basements were flooded.  Only 0.01 inch of rain fell at
        Stapleton International Airport.
      In 1991...heavy rain caused flooding at the junction of I-25
        and I-70.  Dime size hail was reported northeast of Boulder
        near Niwot.
      In 1995...microburst winds gusting as high as 58 mph caused
        minor damage to an apartment complex in Broomfield.  Some
        homes under construction were also damaged when the winds
        knocked over 2 by 4 wood beams along with some insulation
        and roofing materials...which broke a few windows.
        Microburst winds also overturned a camper near Barr Lake.
      In 1996...hail ranging in size from 1 to 1 1/2 inches fell
        near Bennett.
      In 2001...3/4 inch hail fell in the foothills near Conifer.
      In 2008...a record daily rainfall record was set at Denver
        International Airport.  The record of 1.29 inches in 24
        hours broke the previous record of 1.10 inches set in
        1929.

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