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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT WED AUG 13 2025

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

8-13  In 1875...from the 8th to the 13th...clouds of grasshoppers were
        seen flying through the air on the prevailing winds during
        each day.
12-13 In 1975...overnight from the 12th to the 13th...heavy rains
        caused flash flooding along the foothills from Denver
        north.  Thunderstorm rainfall totaled 1.56 inches at
        Stapleton International Airport.
      In 2004...a brief cool spell resulted in two daily
        temperature records.  The low temperature of 49
        degrees was a record minimum for the 12th...as was
        the low temperature of 48 degrees on the 13th.
13    In 1959...thunderstorm winds gusted to 53 mph at Stapleton
        Airport.
      In 1983...thunderstorms dumped torrential rain in Northglenn...
        Thornton...and Broomfield.  Northglenn was drenched with
        1.72 inches in 30 minutes.  Street flooding was widespread.
        Hail...as large as 3/4 inch in diameter...was reported
        7 miles northeast of Boulder along with heavy rain which
        caused some street flooding.
      In 2000...lightning sparked 3 small grass fires near Golden.
        The fires were quickly contained.  Hail as large as 3/4
        inch in diameter fell in Castle Rock.
      In 2019...Hail up to 1 3/4 inches in diameter was observed
        4 miles west of Frederick...with hail up to one inch in
        diameter near Dacono.

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