Public Information Statement
Issued by NWS Denver/Boulder, CO
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
meadowlands...bike 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
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
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.