Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 220859

Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT SAT JUL 22 2017

...Today in metro Denver weather history...

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
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.
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
19-23 In 2005...the high temperature climbed above 100 degrees on
        each of the 5 days with readings of 101 on the 19th...105 on
        the 20th...104 on the 21st...and 102 on both the 22nd and 23rd.
        A new record maximum temperature for the month of July of 105
        degrees was set on the 20th...which also equaled the all time
        record maximum for Denver of 105 degrees first set on August
        8th in 1878.  Daily maximum temperature records were set on
        each day...and the 5 day period equaled the record for the
        most consecutive days of 100 degrees or more first set from
        July 4th through 8th in 1989.  The intense heat resulted in
        a high use of electricity for cooling purposes.  The demand
        for electric power exceeded the supply and rolling black-outs...
        each lasting about an hour...were scheduled across metro Denver
        during the afternoons and early evenings.
20-23 In 1961...unusually cool weather for July resulted in several
        temperature records.  Record minimum temperatures were
        set or equaled on each day with readings of 51...51...49...
        and 49 degrees.  High temperature of only 64 degrees on the
        21st was a record low maximum for the date.
20-25 In 1965...heavy showers and thunderstorms doused metro Denver
        with significant rain each day.  Rainfall for the six days
        totaled 5.16 inches at Stapleton International Airport.
        Massive rainfall occurred on the 20th...21st...and 25th...
        flooding streets and basements and causing streams to
        overflow.  The heaviest rainfall...2.05 Stapleton
        International Airport occurred on the 25th.
22    In 1874...a severe thunderstorm during the late afternoon
        produced 1.36 inches of rainfall in an hour...most of which
        fell in 20 minutes.  There was much damage from flooding
        of streets and considerable damage to private property.
        The lightning was brilliant and continuous during the
        storm.  Seven buildings were struck by lightning in the addition to many places where it struck only the
        ground.  A magnificent example of ball lightning was
        observed.  When about 200 feet above the house tops...the
        ball exploded and broke into 7 or 8 different balls...each
        about 6 inches in diameter.  Upon reaching about 20 feet
        above the ground...these balls broke into small fragments
        about 3 inches long and 1/2 inch wide.  A shed situated
        in an alley about one block away was literally covered
        with these sparks.  After the storm was over...the shed
        and adjacent area showed no trace of the event.  Not the
        slightest mark could be detected on structures or on the
      In 1879...a terrific electrical storm passed over the city
        during the afternoon.  The lightning display was unusually
        vivid and the crash of thunder seemed at the very house
        tops.  A few homes and buildings were struck by lightning.
        A home on Capitol Hill sustained much damage to furniture...
        but the residents in another wing of the house were not
        injured.  Lightning struck a fence at the corner of Curtis
        and Broadway.  A lightning bolt stunned a workman and
        knocked a mason`s trough from his hand.  A school was struck
        but was not damaged.  Lightning struck the ground near
        Tenth and Colfax.  Rain fell in torrents for a time...but the
        heaviest was on the outskirts of the city.  Rainfall in the
        city was only 0.30 inch.
      In 1882...lightning struck and killed a man in the northern
        part of the city.
      In 1895...heavy rainfall of 1.53 inches was measured in
        downtown Denver.
      In 1931...the high temperature reached 100 degrees in
        downtown Denver.
      In 1965...lightning struck and killed a boy standing by an
        automobile near Stapleton International Airport.  Scattered
        heavy showers accompanied by hail and wind occurred across
        metro Denver.  Heavy rain caused some street damage in
        Commerce City.
      In 1973...minor thunderstorm wind damage was reported in
      In 1983...heavy thunderstorms dumped torrential rain and large
        hail across metro Denver.  The most serious problems were
        caused by heavy rainfall in the foothills...which produced
        flooding on Bear Creek.  Runoff from 3 inches of rain in
        45 minutes at Kittredge caused Bear Creek to rise 5 feet in
        10 minutes at Morrison...washing out two bridges.  One bridge
        collapsed...plunging a fire truck into the water...but the
        occupants were not injured.  The town was evacuated for 2
        hours.  Evergreen was drenched with 2.61 inches of rain in
        30 minutes...which caused street flooding along with power
        outages.  Hail to golf ball size damaged cars.  A deck on a
        house east of Evergreen was washed away.  At Idaho Springs...
        2 inches of rain fell in 45 minutes.  Golden received
        3 inches of rain in an hour with 0.80 inch of rain in seven
        minutes at Littleton.  Heavy rain and large hail also fell
        in the City of Denver and its northern and eastern suburbs...
        causing street flooding.  Water was 6 feet deep on one
        Aurora street.
      In 1991...heavy rains caused extensive flooding across north
        metro Denver.  Ralston Creek in Arvada flowed out of
        its banks.  At the intersection of I-25 and I-70...up to 8
        feet of water covered the highway.  A foot of water covered
        a stretch of I-70 in northwest Denver.  Thunderstorm
        rainfall totaled only 0.82 inch at Stapleton International
      In 1998...lightning sparked a fire which caused extensive
        damage to a home in Englewood.  Most of the second floor
        was destroyed.
      In 2004...severe thunderstorms produced hail to 1.25 inches
        in diameter in Commerce City and near Brighton.
22-23 In 1991...heavy rains over the Palmer Divide and along the
        Front Range caused the South Platte River to flood from
        near Henderson to Fort Lupton.  The river was out of its
        banks at several locations with water covering the roads
        through the night.  Only minor damage was reported.

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