Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 030045

Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT SEP 2 2017

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

1-5   In 1995...record breaking heat occurred on the first 5 days
        of the month when the temperature climbed into the 90`s
        on each day.  Record high temperatures of 97 degrees on
        both the 1st and 4th equaled the all-time record maximum
        for the month.  High temperature of 95 degrees on the 3rd
        was a record for the date.  High temperatures of 94 degrees
        on both the 2nd and the 5th were not records.  The low
        temperature of 64 degrees on the 4th equaled the record
        high minimum for the date.
1-7   In 1978...the temperature reached 90 degrees or more on seven
        consecutive days with the highest temperature...94 degrees...
        recorded on both the 4th and 6th.
2-3   In 1892...there was a trace of rainfall each day.  This...
        together with a trace of rain on both the 7th and 8th...was
        the only rainfall of the month...making the month the driest
        on record.  The monthly record was equaled in 1944.
3     In 1901...a thunderstorm produced rain...hail of unknown size...
        and south winds sustained to 40 mph with gusts to 43 mph.
      In 1961...Labor Day snow storm is the earliest date of the
        first snow...trace and measurable...of the season.  The heavy
        wet snow broke many limbs from trees that were still in full
        foliage.  The storm produced 4.2 inches of snowfall at
        Stapleton Airport with nearly a foot of snow in western
        suburbs and in the foothills.  Minimum temperature of 33
        degrees was a record for the date and the coldest ever
        recorded so early in the season.
      In 1999...severe thunderstorms dumped large hail across metro
        Denver.  Hail as large as 1 inch in diameter was measured
        near Cherry Creek in Aurora and near Bennett.  Hail to 3/4
        inch in diameter fell in the City of Denver.
      In 2002...a thunderstorm produced a wind gust to 51 mph at
        Denver International Airport.
      In 2003...very heavy thunderstorm rain washed out parts of
        the Virginia Canyon Road above Idaho Springs.  Up to
        4 feet of mud reportedly washed down the road during the
        storm.  Several vehicles were trapped on the road.  In
        Idaho Springs...several streets...including the main street...
        were also buried in mud and gravel.  Some buildings in
        town experienced minor flooding...including the basement
        of the town library and the police station.
3-6   In 1909...rainfall for the 4 days accumulated to 3.97 inches
        in Boulder...while in Denver rainfall totaled 2.45 inches
        on the 4th...5th...and 6th.
4     In 1909...apparent post-frontal heavy rainfall totaled 1.94
        inches in downtown Denver.  North winds were sustained
        to 19 mph.
      In 1944...a trace of rain fell.  This together with a trace
        of rain on the 9th...10th...and 30th was the only
        precipitation for the month.  The total of a trace of
        precipitation for the month equaled the driest September
        on record first set in 1892.
      In 1960...the highest recorded temperature in September...97
        degrees...occurred.  The same temperature also occurred on
        September 5...1899...September 1...1995...and September 4...
      In 1989...a strong thunderstorm wind gust flipped a plane
        taxiing on a private runway in Adams County east of Denver.
        Two people were slightly injured and the plane was heavily
      In 1992...strong winds developed across metro Denver behind a
        Pacific cold front.  Sustained winds above 40 mph with gusts
        as high as 60 mph were recorded mainly in and near the
        foothills.  Pre-frontal south winds gusted to 37 mph at
        Stapleton International Airport.
      In 1995...two people were injured when lightning struck their
        home in Lakewood.  The lightning entered the attic where it
        started a small fire.  It then traveled through the walls...
        exploding a mirror and spraying glass on the residents.
        Lightning also sparked small grass fires near Aurora...Denver
        International Airport...and Bennett.  The highest recorded
        temperature in September...97 degrees...occurred.  The same
        temperature also occurred on September 5...1899...September
        4...1960...and September 1...1995.
      In 2000...thunderstorm winds gusted to 64 mph in Castle Rock.
5     In 1899...the highest recorded temperature in September...97
        degrees...occurred.  The same temperature was also reached on
        September 4...1960...and September 1 and 4...1995.
      In 1940...a severe wind and hail storm confined mostly to the
        west and north parts of the city occurred shortly after
        4:30 PM.  Hail stones ranged in size from 1/4 to 1/2 inch
        in diameter.  In north Denver...hail piled to a depth of
        4 inches.  Flooding occurred in one underpass...which
        stalled 2 cars.  One girl was injured when the weight
        of the hail flattened a porch on which she stood.
        Northeast winds were sustained to 29 mph with gusts to
        32 mph in downtown Denver.
      In 1987...a thunderstorm complex produced hail as large as
        1 3/8 inches in diameter...2 miles east of Buckley Field in
        Aurora.  No damage was reported.
5-9   In 1988...layers of smoke aloft from large forest fires in
        Yellowstone National Park completely obliterated the sun
        at times.  At Stapleton International Airport...surface
        visibility was reduced at times to 5 and 6 miles in smoke.
5-13  In 2010...the Fourmile Canyon Wildfire...northwest of Boulder...
        broke out on the morning of the 5th.  It originated from
        an unattended fire pit at a local residence. The wildfire
        quickly consumed 5 1/2 square miles or 3500 acres the
        first day...and forced the evacuation of over three
        thousand residents.  Erratic 45-mph gusts sent the fire in
        two directions at times. Very dry weather conditions
        preceded the fire. The combination of strong winds...low
        relative humidities and dry fuels allowed the wildfire
        spread rapidly through the steep...heavily forested terrain.
        The flames were reportedly 20 to 50 feet in length.  Towns
        within the burn area included Salina...Wallstreet and Gold
        Hill. The dry conditions coupled with gusty winds ranging
        from 45 to 64 mph persisted for several more days. Fire
        managers used as many as 700 firefighters and support
        personnel from 35 agencies and seven air tankers to battle
        the wildfire.  A total of 6181 square acres or
        approximately 10 square miles were burned.  The Fourmile
        Canyon Wildfire was the most destructive fire in Colorado
        history in terms of the damage to personal property.  It
        destroyed 171 homes with an estimated cost of 217 million
6     In 1940...a thunderstorm pelted the city with small hail.
        The storm produced some lightning damage.  One woman was
        stunned by a bolt which struck near her.  Heavy rain from
        the storm raised the level of Cherry Creek by more than
        3 feet during the height of the storm.  Rainfall downtown
        was only 0.26 inch.
      In 1988...strong winds blew down two houses that were under
        construction in Castle Rock.  Northwest winds gusted to 44
        mph at Stapleton International Airport.
      In 1993...a man was struck and killed by lightning while
        standing outside his home in unincorporated Arapahoe County
        11 miles south of Denver.  Lightning also struck a cabin in
        Marshdale...20 miles southwest of Denver...which started a
        fire and damaged one room and a portion of the roof.
      In 1995...hail as large as 3/4 inch in diameter fell in Coal
        Creek Canyon in northern Jefferson County.
      In 2001...a thunderstorm dropped 3/4 inch diameter hail in
        Aurora near Cherry Creek.
7     In 1875...the creeks were running dangerously high during
        the night from heavy rains in the mountains.
      In 1885...a thunderstorm produced very white hail of irregular
        shape and about the size of beans.  Precipitation was
        only 0.10 inch.
      In 1971...a vigorous cold front accompanied by a thunderstorm
        produced wind gusts to 48 mph at Stapleton International
        Airport and much upslope cloudiness and light rain across
        metro Denver.
      In 1989...widespread thunderstorms produced lightning strikes
        that knocked out power to about 13 thousand homes in Boulder
        County.  In a rugged area stripped of vegetation by a forest
        fire earlier in July...heavy rain triggered mud slides that
        destroyed one home and severely damaged another in Boulder
        Canyon 10 miles west of Boulder.  In one home...the mud
        caved in an exterior wall and poured into the residence
        only seconds after 2 people had evacuated the premises.
        Rainfall totaled 1 to 3 inches.  Hail 1 3/4 inches in
        diameter fell in Nederland...Idaho Springs...and Golden
        Gate Canyon.  Hail 1 inch in diameter was measured 10
        miles north of Golden.
      In 1993...thunderstorm winds toppled an overhead sign onto
        the intersection of I-70 and I-25 in Denver...causing
        considerable damage to 4 vehicles.  The winds also caused
        a police car to be blown off the road northeast of Denver.
        Thunderstorm winds gusting to 66 mph damaged the siding of
        a residence southeast of Brighton.  A thunderstorm wind
        gust to 53 mph was recorded at Stapleton International
        Airport.  Hail to 7/8 inch in diameter fell at Kittredge
        in the foothills of Jefferson County.
      In 1994...lightning severely damaged a public television
        transmitter atop Squaw Mountain west of Denver.
7-8   In 1884...a windstorm from mid-afternoon until the early
        morning hours of the 8th produced south winds sustained
        to 48 mph.  The strong winds toppled several trees in
        the city.
      In 1892...there was a trace of rainfall each day.  This
        together with a trace of rain on both the 2nd and 3rd was
        the only rainfall of the month...making the month the driest
        on record.  The record was equaled in 1944.
8     In 1886...the last thunderstorm of the season pelted the
        city with hail the size of beans and dropped 0.81 inch of
      In 1962...the earliest first freeze of the season occurred.
        The temperature dipped to a low of 31 degrees.
      In 1973...hail up to 1 1/2 inches in diameter fell northeast
        of Boulder.  A tornado was reported by a pilot east of
        Parker.  No damage was reported.
9     In 1933...heavy rain in the foothills over the Clear Creek
        and Golden Gate canyon watersheds caused flooding in
        Golden and damaged the roadway in Golden Gate Canyon...
        which resulted in its closure.
      In 1969...a funnel cloud was sighted in southeast Denver.
        There was also considerable thunderstorm activity and
        local heavy rain across metro Denver.  Rainfall totaled
        1.30 inches at Stapleton International Airport where small
        hail also fell.
      In 1973...hail from 3/4 inch to 1 3/4 inches in diameter fell
        in Westminster and south of Broomfield.
      In 2009...A man was critically injured when he was struck by
        lightning while riding his bicycle.  He was nearing a
        paramedic van when he was hit.  His heart stopped but
        paramedics quickly responded and were able to resuscitate
      In 2011...A man was struck by lightning at the Adams County
        Fairgrounds.  He was leaning against a tree while watching
        a cross country meet when the tree was hit.  The lightning
        traveled down the tree and up through the ground...using
        him as a conductor.  The victim received second and third
        degree burns.
9-10  In 1933...heavy rain over the Cherry Creek...Plum Creek...Big
        Dry Creek...and Little Dry Creek watersheds caused flooding
        on the South Platte River in Denver overnight.  Nearly an
        inch of rain...0.98 inch...fell in the city.
      In 1944...a trace of rain fell on each day.  This together
        with a trace of rain on the 4th and 30th was the only
        precipitation for the month.  The total of a trace of
        precipitation for the month equaled the driest September
        on record first set in 1892.
      In 1994...unusually very warm weather resulted in three
        temperature records being equaled.  High temperatures
        of 94 degrees on the 9th and 93 degrees on the 10th
        equaled record maximums for the dates.  Low temperature
        of 63 degrees on the 9th equaled the record high minimum
        for the date.

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