Public Information Statement
Issued by NWS Denver/Boulder, CO
NOUS45 KBOU 310045
Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUL 30 2016
...This week in metro Denver weather history...
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. Ironically...no 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
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
27-31 In 1956...96 percent of the total precipitation for the month
of July occurred over the last five days of the month.
Heavy thunderstorms produced 4.00 inches of rainfall at
Stapleton Airport. This amount of precipitation in 5 days
or less had been exceeded only 3 times in previous record.
The last time had been in December of 1913 as snow.
Considerable property damage occurred across metro Denver
31 In 1873...the all-time lowest recorded temperature in July...
42 degrees...occurred. The same temperature also occurred
on July 4...1903.
In 1874...during the late afternoon rain and hail fell for
5 minutes followed by brief heavy rain. Pieces of solid
ice of irregular shape fell upon the roof of the station.
The hail stones measured 1 1/2 inches in diameter.
Precipitation (rain and melted hail) was only 0.16 inch.
In 1889...the high temperature climbed to 100 degrees in
In 1919...heavy thunderstorm rainfall totaled 2.59 inches in
downtown Denver during the evening. Rainfall was 1.90
inches in an hour...a new record at that time.
In 1961...over an inch of rain in a short period of time caused
flooding of streets and basements in Denver. Rainfall
totaled 1.30 inches at 11th and Lincoln in central Denver.
In 1964...the temperature reached 91 degrees in Denver...making
this the 27th day of the month that the temperature reached
90 degrees or more. This is the all time record for 90
degree days in a month in Denver.
In 1972...one inch diameter hail fell in Hudson northeast of
In 1976...during the evening hours extremely heavy thunderstorm
rains produced flash flooding in Big Thompson Canyon which
killed 144 people between Estes Park and Loveland. No
significant weather occurred in metro Denver at the time.
In 1987...1 inch diameter hail fell in Lakewood and 3/4 inch
hail fell near Louisville. Southeast Boulder County was
drenched with 1.25 inches of rain in just 20 minutes.
In 1993...thunderstorm winds damaged a chimney of a home near
In 1996...a weak tornado (F0) was sighted 12 miles east of
Denver International Airport. No damage was reported.
In 1998...heavy monsoonal thunderstorm rain triggered a mud
slide in Blackhawk. The mudslide blocked Main St. and
caused an estimated half million dollars in damage to a
casino. Heavy thunderstorm rain...up to 3 inches in an
hour...caused a flash flood along Buffalo Creek. Portions
of County Road 126 just south of the town of Buffalo
Creek were washed out. The flood waters nearly washed
away the bridge as mud and debris slammed into the
structure. Hail to 1 3/4 inches in diameter fell near
In 2004...severe thunderstorm winds toppled a 65-foot blue
spruce tree in Parker. The tree landed on a home damaging
the roof and gutters. The downed tree poked dozens of holes
into the shingles.
In 2013...severe thunderstorm winds...with gusts estimated to 80
mph...downed power poles which caused scattered outages in and
around Byers...Bennett and Strasburg. Some property damage was
also observed. Near Byers...aluminum siding and roofing was
peeled off sheds. Large hail...up to one inch in diameter...was
reported north of Bennett. At Denver International Airport...
a peak wind gust to 40 mph was observed from the northeast.
1 In 1888...heavy rain in the mountains and foothills caused
flooding on Clear Creek in Golden. The high waters also
washed away portions of the railroad tracks in the canyon
between Idaho Springs and Golden.
In 1901...the temperature reached a high of 100 degrees in
In 1902...the high temperature climbed to 100 degrees in
In 1914...a thunderstorm produced 1.00 inch of rainfall in
just 21 minutes and north winds sustained at 43 mph with
gusts to 50 mph. Rainfall totaled 1.17 inches.
In 1938...the temperature climbed to a high of 100 degrees
in downtown Denver...which is the record maximum for the
date. The temperature was also recorded on this date in
In 1976...flight operations at Stapleton International Airport
were suspended for 90 minutes when the airport tower radar
was knocked out and water reached a foot deep on some taxi
ramps after 1.50 inches of rain fell in one hour. Heavy
rain also caused minor flooding in east Denver and Aurora
where lightning damaged the roof of a home and injured the
owner. One young man was swept down a flooded ditch...but
was rescued by firemen. A number of rafts were floated in
flooded streets. Thunderstorm rainfall totaled 1.71 inches
at Stapleton International Airport.
In 1978...a tornado damaged a house and broke a power pole
5 miles northwest of Parker. A microburst wind gust to
52 mph briefly reduced visibility to 1 mile in blowing
dust at Stapleton International Airport.
In 1985...heavy thunderstorms roared through the southern and
western sections of metro Denver...producing large hail
and heavy rain. Lightning hit a recreational vehicle
trailer causing it to burn. There was a lot of street
flooding over western suburbs where rainfall totaled
over 2 inches in some areas. One inch diameter hail was
reported in Littleton and near Evergreen. Hail piled 4
to 6 inches deep at Tinytown in the foothills southwest
In 1990...a small rope-like tornado was spotted in open
country 15 miles southeast of Centennial Airport.
No damage was reported from the twister.
In 1992...pilots reported a funnel cloud near the
construction site of the new Denver International
Airport. A few minutes later...a tornado was reported
near Bennett. The tornado remained on the ground for
about 18 minutes and was visible from the National
Weather Service office at Stapleton International
Airport. Thunderstorm wind gusts to 70 mph were
reported near Bennett and Watkins with a wind gust
to 60 mph at Brighton. Two men were injured when
struck by lightning. A young man sustained serious
injuries when struck by lightning while jet skiing on
Cherry Creek Reservoir. A man received only minor
injuries when struck by lightning while golfing in
In 1994...heavy thunderstorm rains in the foothills west
of Denver caused the closure of the Virginia Canyon
road north of Idaho Springs by rocks and debris.
In 2001...a 34 year old man on the South Platte River bike
path in Denver received minor injuries when lightning
struck a nearby tree. Lightning...coupled with strong
thunderstorm winds...knocked out electrical power to
about 10 thousand homes and businesses in Golden.
In 2006...strong thunderstorms hit southern metro Denver.
A severe thunderstorm wind gust estimated to 71 mph
knocked down a tree in Aurora near Cherry Creek.
Lightning sparked a fire in a home near Lone Tree and
struck a transformer at an RTD Light Rail station at
Interstate 25 and Yosemite Street. Heavy thunderstorm
rainfall forced the closure of Arapahoe Road between
Holly and Quebec streets due to high water. Flooding
was also reported near Park Meadows Mall and Greenwood
Village. Heavy rainfall also caused flooding in
Highlands Ranch...Lone Tree...and Parker. Water up to
6 inches deep was reportedly running over the roads.
2 In 1878...the high temperature reached 100 degrees in
In 1911...an apparent dry microburst produced sustained
west winds to 42 mph.
In 1972...one workman was killed and another injured when
a strong gust of wind destroyed a partially completed
apartment building in south Denver. Hail to 1 3/4 inch
diameter fell in Golden.
In 1973...hail to 3/4 inch diameter was reported in Boulder.
In 1986...a major outbreak of severe thunderstorms occurred
along the Front Range. Thunderstorms developed
explosively. Some places were hit by large hail twice.
Two inch diameter hail broke car windows on I-25 west of
Brighton...and up to 1 1/4 inch hail broke windows in
Thornton. Baseball size hail damaged several planes near
Watkins. Funnel clouds were sighted around Aurora. Hail
over 1/2 inch in diameter covered the ground 3 to 4 inches
deep at Hudson northeast of Denver. Most of the hail fell
north of metro Denver...but 3/4 inch diameter hail was
measured at Stapleton International Airport. Total damage
from the hail storms this day was estimated at over
10 million dollars.
In 1991...late afternoon thunderstorms produced heavy rain
across metro Denver. Two feet of water covered parts of
I-25 in southeast Denver...while one foot of water covered
parts of U.S. Highway 285 in Englewood. Thunderstorm
rainfall totaled 0.50 inch at Stapleton International
In 2001...severe thunderstorms producing heavy rain and hail...
either washed out or damaged several county roads in the
Watkins and Bennett areas. A small tornado (F0) touched
down near Bennett...but did no damage. Hail as large as
1 3/4 inches in diameter fell near Watkins. One inch
diameter hail was measured near Hudson and Keenesburg.
In 2008...strong winds blew several trees down in Denver...
damaging homes and downing power lines. A peak wind gust
of 67 mph occurred at Centenniel Airport...with gusts to 60
mph estimated in Denver. A peak wind gust of 37 mph was
measured at Denver International Airport. An elderly man
was killed when a wind damaged tree broke free and crushed
him while he attempted to remove it. The downed power
lines caused outages to about 500 Xcel Energy customers.
2-3 In 1876...grasshoppers were in great abundance in the city
and caused considerable damage to gardens and to crops
in the surrounding farms and ranches.
In 1951...heavy thunderstorms rumbled across metro Denver
through the night. Heavy rain totaled 3.45 inches at
Stapleton Airport. This was the greatest 24 hour
precipitation ever recorded during the month of August
In 2007...Heavy rain caused localized flash flooding near
Ft. Lupton. Up to 8 inches of water was reported across
County Road 18. In addition...several other county roads
in the immediate area were washed out.
3 In 1878...the high temperature climbed to 100 degrees in
In 1900...a thunderstorm produced west winds sustained to
48 mph with gusts to 55 mph...but only a trace of rain.
In 1903...a thunderstorm produced a trace of rainfall and
northwest winds sustained to 45 mph with gusts to 60 mph.
The high temperature was 99 degrees.
In 1927...a thunderstorm produced hail and sustained north
winds to 22 mph.
In 1933...heavy cloudburst rains caused the failure of the
Castlewood Dam...which resulted in flash flooding on Cherry
Creek...the deaths of 7 people in Denver...and flood damage
estimated at 1 million dollars. Lower Denver was flooded
during the morning by waters pouring down Cherry Creek
and its valley from Castlewood Dam...which had broken
between midnight and 2:00 AM. Heavy rain of 3 to 9 inches
in 9 hours in the watershed above the dam resulted in the
failure. At 7:30 AM...the flow in Cherry Creek was reported
at 16 thousand second-feet as compared with a peak flow of
3 thousand second-feet in other years. The flood waters
ruined hundreds of acres of crops and drowned scores of
farm animals. Six bridges in Denver were swept away.
Great deposits of mud were left in the lower sections of
the city...including hundreds of basements and lower floors
of buildings. At the end of the month...a deadly stench
still rose from swampy areas near the lower city limits.
In 1963...heavy thunderstorm rains in the Parker area caused
Cherry Creek to overflow...which damaged roads.
In 1985...a tornado touched down briefly about 10 miles
northeast of Parker. No damage was reported.
In 1991...upslope northeast winds produced chilly temperature
readings and heavy rain across metro Denver. Rainfall...
with no thunder...totaled 1.56 inches at Stapleton
International Airport where the heavy rain briefly reduced
the surface visibility to 7/8 mile. The mercury climbed to
a high of only 63 degrees.
In 1992...a thunderstorm wind gust to 64 mph was recorded in
Brighton. A wind gust to 60 mph was measured near the
construction site of the new Denver International Airport.
Lightning started a fire in an Evergreen church...causing
over 75 thousand dollars in damage.
In 1998...3/4 inch hail fell in Jefferson County 15 miles
northwest of Arvada.
In 2006...heavy thunderstorm rainfall caused flash flooding
along Leyden Creek in unincorporated Jefferson County.
An automated rain gauge on upper Leyden Creek...6 miles
northwest of Arvada...measured 2.68 inches of rainfall in
less than 2 hours. Two to three feet of water covered the
roadway at the intersection of 82nd and Quaker Street.
In 2009...a woman riding her bike...in training for an Ironman
Triatholon...was struck by lightning in Boulder. She was in
the 78th mile of a 100-mile training ride when she was
hit. The woman lost her vision initially and couldn`t
move her arms. After a short stay in the hospital...she
made of complete recovery.
In 2013...severe wet microburst thunderstorms produced
damaging winds and very heavy rain in and around Buckley
Air Force Base...Erie and Lafayette. Peak gusts included:
68 mph in Erie...61 mph at Buckley AFB...and 60 mph in
Broomfield...4 miles east-southeast of Erie and Lafayette.
In Erie...a velodrom under construction was heavily damaged
by heavy rain and high winds. The wind toppled the eastern
third of the 250-meter cycling track. Bolts measuring
one-half-inch thick by 7 1/2 inches in length were ripped out
of concrete footers while 16-inch-wide trusses...collapsed
under the force of the wind. In town...heavy rain...around
2.5 inches in less than one hour...caused extensive street
flooding. The intense wind also downed trees which resulted
in localized power outages. In addition...an empty semi-trailer
was blown on its side. A weak non supercell tornado touched
down briefly in an open field...7 miles northwest of Hudson.
The storm forced seven incoming flights at Denver
International Airport to be diverted and contributed to
45-minute delays for others. At Denver International
Airport...a peak wind gust of 55 mph was observed from the
northeast...with 0.66 inches of rainfall recorded. The very
heavy rain produced flash flooding in part of Aurora. Road
closures were set up in both directions on both Picadilly Road
and Gun Club Road...just north of Buckley AFB. A man had to be
rescued when his car was trapped in flood waters at the
intersection of 6th Ave. and Picadilly Road. Flash Flooding
was also observed at the junction of E-470 and I-70 with water
running over the road.
3-4 In 1988...two inches of rain fell in 3 hours at both Morrison
and Wheat Ridge. Thunderstorm rainfall totaled 0.80
inch overnight at Stapleton International Airport.
4 In 1889...southwest winds were sustained to 42 mph with
an extreme velocity to 52 mph.
In 1924...0.01 inch of rain fell over downtown Denver. This
along with the 0.01 inch of rainfall on the 10th was the
only rainfall of the month...the driest August on record.
In 1963...heavy rains in the foothills above Idaho Springs
caused mud and rock slides which closed U.S. Highways 6
and 40 for a time.
In 1976...hail to 1 inch diameter was reported 12 miles
southwest of Denver. Hail to 3/4 inch in diameter was
reported in Lakewood. Small hail...1/4 to 1/2 inch in
diameter...fell at Stapleton International Airport.
In 1982...heavy rain poured through the roof of a clothing
store in Aurora...causing widespread water damage. The roof
was being repaired when the storm hit.
In 1983...hail up to one inch in diameter fell in Aurora
where heavy rain produced street flooding.
In 1984...a Colorado State Trooper was struck and injured by
lightning in Northglenn.
In 1989...a microburst wind gust to 52 mph was recorded at
Stapleton International Airport.
In 1997...lightning sparked a small fire in a home in Arvada...
causing minor damage. Several intersections in both Arvada
and Westminster were flooded by thunderstorms producing
heavy rain. Several cars were damaged by the high waters...
and a number of businesses were flooded.
In 1999...flooding and flash flooding problems developed over
metro Denver as slow moving thunderstorms dumped from 2 to
3.5 inches of rainfall in about 3 hours. Near the junction
of I-25 and U.S. Highway 36...up to 4 feet of water flooded
an auto dealership. About 45 cars were ruined. Damage
estimates to the dealership alone totaled nearly a half
million dollars. Sections of I-25 and U.S. 36 near the
interchange were closed due to floodwaters. Floodwaters...
up to 5 feet deep...forced the evacuation of two mobile
home parks in Federal Heights. Railroad tracks were
washed out near Federal Blvd. and 64th Avenue. Numerous
power outages caused widespread blackouts in Thornton and
Littleton. Along Massey Draw near Carr St. and Chatfield
Reservoir...4 homes were flood damaged and portions of their
backyards washed out. Widespread street flooding was also
reported in Boulder where several buildings were flood
damaged...including the University of Colorado Memorial
In 2004...two golfers were shocked when lightning struck the
eighth green of the golf course at Castle Pines north of
Castle Rock. The two men suffered only minor injuries.
Heavy thunderstorm rain from the same storm caused flash
flooding. Floodwaters rushed across parts of U.S. Highway
85 near the entrance to the Castle Pines Golf Club. The
traffic lanes were covered with up to 6 inches of running
In 2008...lightning sparked a grassfire that consumed 300
acres on the northern edge of Green Mountain...in Jefferson
County. Gusty winds and very dry conditions allowed the
wildfire to quickly spread and threaten several houses.
Fortunately...only minor damage was reported to homes due
to smoke and melted siding.
5 In 1881...the low temperature cooled to only 76 degrees...the
record high minimum temperature for the month.
In 1889...southwest winds were sustained to 42 mph.
In 1918...hail pelted the city...but was light and caused no
damage. Precipitation totaled 0.25 inch. Northwest winds
were sustained to 31 mph.
In 1964...lightning struck two boys in Denver while playing
ball. One was treated and released from the hospital...but
the other boy suffered second degree electrical shock and
cardiac arrest and was hospitalized in critical condition
for several days.
In 1969...two tornadoes touched down briefly in an open field
southeast of Buckley Field in Aurora. No damage was
In 1970...heavy rain in the Indian Hills area in the
foothills west of Denver caused flash flooding...which
washed out roads and damaged other property. Hail
accumulated to a 3 inch depth with stones up to golf ball
size; however...most of the damage was from flooding.
In 1982...2.38 inches of rain fell in an hour in Arvada...
causing minor flooding on Ralston Creek. In Westminster...
1 1/2 inches of rain fell...causing damage to streets and
culverts. In addition...lightning caused some minor power
outages across metro Denver.
In 1983...very heavy thunderstorms hit the southern portion of
metro Denver. Heavy rainfall...as much as 2.89 inches in 38
minutes...caused widespread street flooding in southeast
Denver. Two feet of water covered a section of I-25. Hail
up to golf ball size accompanied the storm in Littleton and
Englewood...along with 60 mph winds.
In 1984...a heavy thunderstorm drenched Littleton with up to
2.35 inches of rain in an hour...along with small hail that
piled up to 2 inches deep. Flood waters were up to 4 feet
deep in parts of town with many basements flooded. There
were some power outages caused by lightning.
In 1990...a thunderstorm dumped 1.25 inches of rain in 12
minutes near Tower and Smoky Hill Roads in southeast
Aurora. Minor street flooding was reported in the area.
In 1992...a pilot reported two funnel clouds near Cherry Creek
Reservoir. Both dissipated quickly. Dime size hail fell
In 1994...one inch diameter hail fell near Strasburg. No
damage was reported.
In 1999...a dog kennel east of Denver International Airport...
was flooded when a small dam...upstream in Elbert County...
was breached. The floodwaters...up to 4 feet deep...washed
away some 6-foot fences and other small buildings. Ten of
the 70 dogs boarded at the kennel drowned.
In 2002...a mail carrier was struck by lightning as he
inserted a key into a multi-unit mailbox in Bailey.
The shock knocked the man back against the mail truck.
He suffered minor injuries. Lightning struck a residence
in Commerce City. The resulting fire destroyed the roof
of a detached garage and damaged much of its contents.
Hail as large as 1 3/4 inches in diameter pelted Pine.
One inch diameter hail fell in Arvada and southwest Denver.
Heavy rain triggered a mudslide along U.S. Highway 285
near Bailey. Both lanes of traffic had to be closed
until debris could be removed from the highway. Several
residences in the Bailey and Glenisle areas were also
In 2004...heavy thunderstorm rainfall caused localized flash
flooding in Virginia Canyon near Idaho Springs. Sections
of the Virginia Canyon Road had to be closed due to the
In 2008...a severe thunderstorm produced large hail...up to
1 1/4 inches in diameter...northeast of Parker. Several
automobiles were damaged.
6 In 1877...a severe rain...hail...and wind storm struck Denver.
The storm produced a one minute sustained wind speed of
75 mph. Rainfall totaled 1.00 inch in 25 minutes. The
hail storm damaged vegetable gardens in the city.
In 1954...an unconfirmed tornado was reported in Westminster.
A funnel cloud was sighted in the area...but it was not
certain if it had touched down. No damage was reported.
In 1980...the temperature reached 100 degrees...setting a new
record high for the date.
In 1982...3/4 inch diameter hail was reported in north Denver.
Heavy rain caused street flooding in central Denver where
4 to 5 feet of water inundated I-25...closing the freeway
for a while. Rainfall across metro Denver ranged up to
2.35 inches in just over an hour. An estimated 2000
basements were flooded. Only 0.01 inch of rain fell at
Stapleton International Airport.
In 1991...heavy rain caused flooding at the junction of I-25
and I-70. Dime size hail was reported northeast of Boulder
In 1995...microburst winds gusting as high as 58 mph caused
minor damage to an apartment complex in Broomfield. Some
homes under construction were also damaged when the winds
knocked over 2 by 4 wood beams along with some insulation
and roofing materials...which broke a few windows.
Microburst winds also overturned a camper near Barr Lake.
In 1996...hail ranging in size from 1 to 1 1/2 inches fell
In 2001...3/4 inch hail fell in the foothills near Conifer.
In 2008...a record daily rainfall record was set at Denver
International Airport. The record of 1.29 inches in 24
hours broke the previous record of 1.10 inches set in