Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 310859

Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT TUE MAY 31 2016

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

26-31 In 1995...a cool period with light morning showers and
        moderate to heavy afternoon showers and thunderstorms
        pushed rivers already swollen from mountain snow melt
        over their banks causing minor flooding.  Streams and
        rivers such as the South Platte and Boulder Creek flooded paths...roads near streams...and other
        low lying areas.  No significant property damage was
        reported and crop damage was unknown.  Rainfall totaled
        1.79 inches at the site of the former Stapleton
        International Airport and only 1.51 inches at Denver
        International Airport.
29-1  In 1894...heavy rain combined with snowmelt runoff caused
        widespread flooding over the South Platte River basin.
        Rainfall was heaviest in the foothills where 5 to 8
        inches were measured over the 4 days.  Heavy rainfall
        west of Boulder flooded mining towns and damaged mining
        properties.  In the canyons above Boulder...railroads
        and roads were washed out along with many bridges.  The
        floodwaters spread into central Boulder and covered a
        wide area from University Hill north to near Mapleton
        Hill to a maximum depth of 8 feet.  Many houses were
        swept away...and every bridge in Boulder was destroyed.
        A few people...trapped in their homes by the floodwaters...
        had to be rescued.  However...the gradual rise of the flood
        waters resulted in only one death.  Boulder Creek spread to
        a width of nearly one mile in the pasture land to the east
        of Boulder.  Extensive flooding on Left Hand Creek north
        of Boulder washed away railroad and wagon bridges.  The
        heavy cloudbursts caused flooding on Bear Creek...which
        washed away bridges...railroad tracks...and structures and
        destroyed the canyon roadway.  Morrison sustained the
        heaviest flood damage on Bear Creek.  In Denver...rainfall
        totaled only 1.50 inches on the 30th and 31st...but the
        heavy rainfall on upstream tributaries of the South Platte
        River caused the river to rise as much as 10 feet above the
        low water mark in the city...which caused some flooding of
        pasture land downstream to a depth of 6 feet near Brighton.
30-31 In 1935...heavy thunderstorm rains overnight caused flash
        flooding east of the city on both Kiowa and Bijou creeks...
        resulting in a total of 9 deaths.  Most of the damage was
        on Kiowa Creek where there were more structures.  The
        water rose rapidly during the storm...ripping houses and
        stores from their foundations and sweeping them downstream.
        Precipitation in Denver totaled only 0.01 inch.  Hail fell
        in the city for a short time.  The hail was very small and
        caused no damage.
      In 1983...a late storm of rain and snow hit the Front Range.
        Over an inch of rain fell at some spots...and above 7
        thousand feet...1 to 5 inches of snow whitened the ground.
        Some snow flakes even fell in the western suburbs of metro
        Denver on the night of the 30th.
      In 2002...unseasonably warm weather at the end of the month
        resulted in 3 temperature records.  High temperature of
        91 degrees on the 30th equaled the record maximum for the
        date.  Low temperature of 61 degrees on the 31st was a
        record high minimum for the date.  High temperature of 93
        degrees on the 31st was a record maximum for the date.
31    In 1917...rainfall totaled 0.55 inch and was mixed briefly
        with snow around midday.  Only a trace of snow fell.
        Cold temperatures during the day resulted in a high
        of 44 degrees and a low of 35 degrees.  The month closed
        as the coldest May on record with a mean temperature of
        only 48.7 degrees...about 8 degrees below normal.  The
        cold temperatures during the month had a marked effect
        on shade trees and shrubs in the city.  Elms were just
        starting to leaf.  Leaves on cottonwoods and maples were
        only half formed.  Lilacs were just blooming...and snowball
        clusters would not bloom for days.
      In 1959...the public reported a tornado briefly touching the
        ground 10 miles south of Stapleton Airport.  No damage
        was reported.
      In 1984...a thunderstorm microburst produced a wind gust to 67
        mph...7 miles east of Boulder.
      In 1991...hail to golf ball size pummeled southern and
        southeastern sections of metro Denver and continued on east
        to Watkins.  Several houses and cars were damaged.  Later...
        thunderstorms dumped heavy rain across the City of Denver...
        causing street flooding in an area just south of downtown
        and just northwest of downtown.  Water was up to 10 inches
        deep over northwest Denver.  A brief tornado touched down in
        Castle Rock where 3/4 inch diameter hail also fell.
      In 1993...thunderstorms dropped dime size hail in Commerce
      In 1994...lightning struck an apartment in Louisville and
        damaged electronic equipment...including a computer.
      In 2006...a severe thunderstorm produced 1 inch diameter
        hail near Boulder.

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