Public Information Statement
Issued by NWS Denver/Boulder, CO
NOUS45 KBOU 240045
Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT JUL 23 2016
...This week 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. 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
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 inches...at Stapleton
International Airport occurred on the 25th.
24 In 1896...heavy cloudbursts in the foothills west of Denver
caused flash flooding on Bear Creek...Clear Creek...Golden
Gate Gulch...and Mount Vernon Creek...resulting in a total of
27 deaths. The downpour dislodged large boulders...one of
which crushed a house. The heavy rain also caused a dam on
Cub Creek to wash out...adding even more water to the flood.
A wall of water as high as 10 feet flooded Evergreen and
passed down Bear Creek...washing away many structures along
the way. The flood crest produced 3 feet of water in
downtown Morrison during the early evening. Flash flooding
on Mount Vernon Creek added to the flooding in Morrison.
In Golden...the flooding washed out bridges on Clear Creek
and on Cresman and Tucker Gulches and forced the closure of
the power plant. In Denver...a thunderstorm produced hail
of unknown size during the afternoon and rainfall of 1.23
In 1958...a thunderstorm wind gust to 52 mph was recorded at
In 1965...heavy rain caused flooding on Clear Creek and Tucker
Gulch in Golden and west Denver. Damage in Golden was
estimated at 80 thousand dollars. Heavy rain south of
Denver washed out temporary earthen bridges constructed
following the June floods in Castle Rock...Littleton...
Englewood...and Denver. Bear Creek in south Denver reached
flood stage. A cloudburst on Cub Creek in Evergreen washed
out bridges and roads. Heavy rain fell over all the Denver
and Aurora areas...causing some flooding of roads...streets...
and bridges. A man drowned in a flooded irrigation canal
near Hudson. Heavy rain caused flooding of streets and
roads in Blackhawk and Central City. Hail caused minor
damage in Idaho Springs.
In 1967...seven bridges were washed out along a normally dry
creek bed south of State Highway 7 west of Brighton. One
car was washed into the creek when a bridge gave way.
In 1970...hail stones to 1 1/4 inches in diameter fell in the
foothills of Jefferson County southwest of Denver.
In 1971...golf ball size hail was reported in foothill areas
of Jefferson County west of Denver. A funnel cloud was
sighted in Aurora. Wind gusts estimated at 60 mph...hail...
and heavy rain up to an inch in 15 minutes caused local
flooding and some other damage in several areas of metro
Denver. Hailstones to 3/4 inch in diameter fell 7 miles
southeast of Denver.
In 1973...a thunderstorm wind gust to 52 mph was recorded
at Stapleton International Airport where one inch diameter
hail was measured.
In 1981...strong winds downed a power line in northeast Denver.
Wind gusts to 50 mph were recorded at Chatfield Reservoir.
In 1987...3/4 inch diameter hail fell 5 miles northeast of
In 1996...hail...up to 1 3/4 inches in diameter...fell at
Chatfield Reservoir. Hail to 3/4 inch in diameter was
measured near Bennett.
In 2000...lightning struck near two golfers at Ute Creek Golf
Course near Longmont...knocking them to the ground. The
men received only minor injuries.
In 2001...lightning from a thunderstorm knocked out electrical
power to about 1500 residents in the City of Denver.
In 2004...a chilly day with fog and thunderstorms resulted in
two temperature records. The low temperature of 49 degrees
was a record minimum for the date. The high temperature of
only 58 degrees was a record low maximum for the date.
24-25 In 2003...maximum temperature of 100 degrees on the 24th was a
record high for the date. Low temperature of 73 degrees
on the 25th was a record high minimum for the date.
25 In 1875...brief heavy rain and hail lasted only 5 minutes...
but the 1/4 inch diameter hail covered the ground to a
depth of 1/2 inch and made the streets look like there
had been snowfall. There was much crop damage...especially
to corn...and some sheep were killed. Precipitation totaled
0.51 inch in the city.
In 1896...a heavy thunderstorm produced sustained northwest
winds to 45 mph with gusts to 50 mph and 1.02 inches of
In 1965...a cloudburst dumped 1.99 inches of rain in 30
minutes at Stapleton International Airport. The storm was
accompanied by strong winds gusting to 70 mph. The heavy
rain flooded numerous streets in east Denver and Aurora.
One inch diameter hail accompanied a cloudburst...9 miles
southwest of Denver. A funnel cloud was sighted 25 miles
northwest of Denver. In Aurora...there were unofficial
reports of 2.30 inches of rain in 40 minutes and 3.30
inches of rain in 30 to 40 minutes. Rainfall totaled 2.05
inches at Stapleton International Airport. Rainfall of
2.42 inches for 24 hours on the 24th and 25th was the
second greatest on record for July.
In 1977...a tornado touched down briefly in Aurora southeast
of Cherry Creek Reservoir. No damage was reported.
A funnel cloud was sighted for 4 minutes by National
Weather Service personnel 10 miles north of Stapleton
International Airport near Henderson.
In 1991...heavy rain...up to half an inch in 10 minutes...caused
flooding in Westminster...Northglenn...and north Denver where
a section of railroad track was washed away. At Stapleton
International Airport...heavy thunderstorm rain totaled 1.85
inches and briefly reduced the visibility to 1/4 mile.
Hail to 1/8 inch in diameter was also measured. A tornado
touched down briefly near Fort Lupton. No damage was
In 1998...heavy monsoonal thunderstorm rains caused flooding
and flash flooding in eastern and southern sections of
metro Denver...including Englewood and Aurora...when about 2
to 3 inches of rain inundated the area. Both I-25 and I-70
were closed for 2 to 3 hours as several low lying areas
became impassable due to the high waters. The water was
estimated to be 15 feet deep in one flooded underpass along
I-25. As a result...the freeway was closed from south of
6th Avenue to University Blvd. Standing water forced the
closure of I-70 at Gun Club Road east of Denver. In
Englewood...U.S. Highway 285 was closed...when high water
made it impassable. Several cars were reportedly floating
down the roadway near Sheridan Blvd. In Aurora...the
intersection at Yale Ave. and Chambers Rd. was flooded by
high water up to 4 feet deep when a spillway on the High
Line Canal was breached. Lightning also knocked out 11
transformers across metro Denver...causing several small
fires and scattered power outages. Flood and flash
flooding also occurred north of Strasburg when as much
as 2.51 inches of rain fell in an hour. The deluge
resulted in considerable flooding of local streets and
county roads. Torrential rainfall of 2 to 3 inches in
less than an hour triggered a flash flood in Virginia
Canyon. County Road 279 between Idaho Springs and
Central City was closed for two days to clear debris
from mudslides. Several cars in Idaho Springs were
washed off the road...and numerous basements were flooded
in town. Thunderstorm rainfall totaled 2.69 inches at
Denver International Airport.
In 2001...lightning struck two homes in Lafayette...damaging
the roof and attic of one and shorting out the electrical
system in another. Hail to 1 3/4 inch in diameter was
measured 7 miles north of Castle Rock with 3/4 inch hail
7 miles north of Sedalia.
In 2005...heavy thunderstorm rain in the vicinity of the
Overland Wildfire burn scar triggered a mudslide in
Jamestown. Rocks the size of bowling balls...along with
silt and mud slid down the mountain into the town. No one
was injured. One parked car was buried by the debris.
In 2006...heavy thunderstorm rainfall caused flash flooding
1 mile north of the town of Westcreek in southwestern
Douglas County. Several maintenance roads were washed out
by the floodwaters.
26 In 1891...a thunderstorm produced sustained northeast winds
to 44 mph with gusts to 60 mph and 0.16 inch of rain.
In 1894...a thunderstorm produced sustained southwest winds
to 36 mph with gusts to 58 mph...but only 0.04 inch of rain.
In 1910...the high temperature reached 100 degrees in
In 1959...a Denver man was stunned while standing by a car
that was struck by lightning. He was treated for burns and
shock at a local hospital. Thunderstorm winds gusted to 55
mph at Stapleton Airport.
In 1983...two heavy thunderstorms hit the northern and western
suburbs. The first drenched Northglenn with an inch of rain
in 30 minutes. The second storm dumped an inch or more of
rain in Idaho Springs and Evergreen. The heaviest rainfall...
2.90 inches in an hour...caused minor street flooding in
In 1984...heavy early morning thunderstorms drenched the
foothills southwest of Denver. Rainfall to 1 1/2 inches in
just 30 minutes occurred between Evergreen and Conifer. In
nearby Turkey Creek Canyon...1.80 inches of rain was recorded
in 35 minutes.
In 1985...a long rope-like white tornado touched down 5 miles
east of Erie and stayed on the ground...mainly over an open
field...for 18 minutes. However...the twister damaged a few
cars on I-25 and injured 3 people from broken glass. The
storm flipped over a van...blew out car windows...and ripped
a highway sign. It also blew an outbuilding off its
foundation. A tornado also touched down briefly 8 miles
north of Bennett. No damage was reported from this storm.
In 1988...a 9-year-old girl was slightly injured by lightning
In 2003...a severe thunderstorm in and south of Franktown
produced hail as large as 1.75 inches in diameter.
26-27 In 1885...heavy cloudbursts on the Palmer Divide south of
Denver caused flooding on Cherry Creek in the city
overnight. The high water washed away street and railroad
bridges and a few houses. The flood waters completely
inundated the rail yards in lower downtown. This was the
worst flood on Cherry Creek since May 19-20...1864...but the
damage was mitigated by stream improvements and fewer
structures near the channel. There was also no simultaneous
flood on the South Platte River to slow the flow of water
through the city. Rainfall in the city was only 0.08 inch
on the 26th.
27 In 1897...an apparent dry microburst produced sustained west
winds to 48 mph with gusts to 60 mph and a trace of rain.
In 1901...a thunderstorm produced north winds to 38 mph with
gusts to 41 mph and rainfall of only 0.01 inch in downtown
Denver. This was the only measurable rainfall of the month...
making this the driest July on record.
In 1953...an unconfirmed tornado in south Lakewood touched down
briefly and abruptly dissipated. No damage was reported
from the twister.
In 1955...the public sighted a funnel cloud estimated at 500
feet above the ground near the western edge of Lowry Field.
Wind estimates up to 60 mph were reported in the vicinity.
In 1956...a severe thunderstorm produced 3/4 inch diameter hail
and wind gusts to 48 mph at Stapleton Airport where rain
fall totaled 1.08 inches.
In 1965...a tornado was sighted 21 miles south of Denver in
Douglas County. No damage was reported.
In 1977...a thunderstorm wind gust to 51 mph was recorded
at Stapleton International Airport. A funnel cloud was
sighted by an aircraft east of Parker.
In 1982...heavy rain doused Boulder with 1 1/2 to 3 inches of
rain over a short period of time...causing extensive street
In 1984...strong thunderstorms drenched several areas.
Rainfall of 1.04 inches occurred in just 20 minutes at
Boulder. Downpours also hit Aurora and northeast Denver...
delaying flights at Stapleton International Airport for an
hour. Up to 3/4 inch of rain fell in central Aurora in 15
In 1989...lightning hit a home in Littleton...setting a bed on
fire. Damage was confined to the bedroom.
In 1994...lightning struck a furniture store in Boulder...
igniting a fire which caused major damage to the building
In 1997...lightning sparked a fire...causing extensive damage
to a home in Watkins. Heavy rain caused Lena Gulch to
surge 2 feet over its banks in Golden. The fire department
had to rescue a man when his van stalled in high waters.
High waters from swollen creeks and streams washed out
bridges and several sections of road in southeast Aurora.
A 200-to-300 foot section of road was washed away where
Picadilly Street dips across Coal Creek. Three youths
had to be rescued when they became stranded by rapidly
rising water in another normally dry creek bed.
In 1999...lightning was suspected of igniting a fire which
caused substantial damage to a farm in Hudson. The blaze
destroyed a 10-foot by 60-foot metal pole barn...a pick-up
truck...a SUV...a boat and trailer...3 four wheeler vehicles...
and other farm equipment.
In 2007...a man was struck and killed by lightning while
jogging at Matthews Winters Park in Morrison.
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
28 In 1882...intense thunderstorm lightning struck a number of
places in the city...but no significant damage was reported.
In 1910...heavy thunderstorm rainfall totaled 2.21 inches in
downtown Denver. Rainfall was 1.11 inches in an hour during
the early afternoon.
In 1922...heavy rainfall to the south of Denver caused Cherry
Creek to rise to the top of the retaining walls in the city.
The creek did not flood; however...the large volume of water
discharged into the South Platte River did inundate a few
blocks of Globeville. Flooding also occurred along Bayou
Creek near Franktown to the south of the city.
In 1923...thunderstorm winds were sustained to 38 mph with
gusts to 52 mph.
In 1957...iridescent cirrocumulus clouds of unusual formation
and brilliant color...oriented from southwest to northeast
over metro Denver...were sighted by U.S. Weather Bureau
observers at Stapleton Airport shortly after noon.
In 1966...heavy rains from a severe thunderstorm caused flash
flooding on Deer Creek...southwest of Littleton. A child was
injured when washed from a car caught in the flood waters.
The flooding damaged property along the creek. Strong winds
damaged several houses in suburban Littleton.
In 1970...a microburst wind gust to 52 mph was recorded at
Stapleton International Airport.
In 1974...a tornado was sighted just east of Buckley Field in
Aurora. No damage was reported.
In 1982...up to 2.50 inches of rain drenched an area just
southwest of Denver in 30 minutes. This was the second day
of heavy rain across portions of metro Denver.
In 1984...1.25 inches of rain fell in 45 minutes in Arvada.
Minor flooding occurred on Bear Creek after a small dam
In 1989...lightning killed two men in Arvada. They were taking
wash from a clothesline when a bolt hit the older man...39...
killing him instantly. The bolt then traveled along the
line...which was stretched between 2 tall trees...and hit his
26-year-old brother who died the next day.
In 1996...several weak tornadoes developed along a thunderstorm
outflow boundary that moved into southern Weld...northern
Jefferson...and Adams counties. The tornadoes sighted near
Bennett...Barr Lake...and in Arvada caused little damage.
Strong thunderstorm winds downed several trees in the City
of Denver and toppled several trees 7 miles west of Arvada
where shingles were blown off several houses. Thunderstorm
wind gusts reached 58 mph in Broomfield.
In 1997...a weak tornado touched down briefly in Parker...
damaging a greenhouse. Twenty pieces of the fiberglass
roof were ripped away. Heavy rainfall in the foothills
washed out some culverts in the Pine and Conifer areas.
Heavy rainfall spread over the plains with 4 to 7 inches
reportedly falling near Hudson. Several county roads
were washed out between Fort Lupton and Hudson. Several
basements in the area were flooded up to the ceiling.
Standing water...up to 3 feet deep...was reported in some
backyards. Later in the evening...a flash flood killed
5 people and injured 40 others in two mobile home parks
in Fort Collins. The torrential rainfall also caused
extensive damage on the Colorado State University campus.
Thunderstorm rainfall totaled 0.80 inch at Denver
International Airport and 1.09 inches at the site of
the former Stapleton International Airport.
In 1999...heavy rainfall...up to 3 inches an hour...triggered
a massive rock and mudslide along I-70 near Bakerville.
The slide area was about 200 feet wide and 20 feet deep.
Several other smaller slides were also reported along
the highway. As a result...I-70 was closed for nearly
25 hours in both directions until the debris could be
cleared from the roadway. The blockage of I-70 was one
of the longest in the history of the highway in Colorado.
A severe thunderstorm produced a wind gust to 64 mph at
Denver International Airport. The storm also produced
1.56 inches of rain and briefly reduced the visibility
to 1/4 mile.
In 2004...a severe thunderstorm produced hail as large as
1 inch in diameter in Thornton.
In 2010...a wet microburst produced very heavy rain and
torrential hail in Boulder County...in the vicinities of
Caribou...Nederland and Eldora. Flash flooding washed
out sections of County Roads 126 and 128 near Caribou.
Several large boulders had fallen across the roadways.
Considerable flooding was reported in Nederland.
Water was also observed running across County Road
130...between Eldora and Nederland. The hail had
accumulated up to 8 inches deep near Eldora. Several
vehicles were stuck in the ice...forcing the temporary
closure of CR130 and the Lake Eldora Ski Road until
snowplows could clear away the hail. Lightning strikes
caused minor damage to two local businesses in
Nederland. At Denver International Airport...a
thunderstorm produced 0.30 inches of rain along with a
peak wind gust to 38 mph.
In 2012...a tornado touched down briefly at the southeast
corner of Mt. Evans near Lincoln Lake. The estimated
elevation where this tornado touched down was near
12500 feet. This would make this tornado one of the
highest ever observed in the U.S.
In 2014...two weak landspouts touched down; one near Ft.
Lupton and the other on the southwest side of the
Rocky Mountain Arsenal Wildlife Refuge. No damage was
reported. A strong thunderstorm wind capsized a boat
in Barr Lake. All three occupants made it to shore
with no injuries.
28-30 In 1889...dense smoke from forest fires in the mountains
obscured the sun over the city for three days.
In 1971...a vigorous cold front late on the 28th produced
northeast wind gusts to 39 mph and record breaking cold
temperatures on the 29th and 30th. The temperature dipped
to 47 degrees on the 29th and 43 degrees on the 30th...
setting record minimums for the dates. Upslope cloudiness
along with rain and fog early on the 29th helped set a
record low maximum temperature of 58 degrees for the date.
29 In 1878...a total eclipse of the sun was observed at 2:20 PM.
From before to during the eclipse...the temperature in the
sun fell from 114 degrees to 82 degrees...while the shade
temperature fell from 89 degrees to 83 degrees.
In 1880...heavy thunderstorm rain and hail flooded streets
and ditches. In 25 minutes...0.76 inch of rain fell on the
city along with large hail to 3/4 inch in diameter. There
were no strong winds with the storm.
In 1890...a thunderstorm produced sustained west winds to
48 mph with gusts to 60 mph...but only 0.01 inch of rain.
In 1956...heavy rain and hail fell over west and north Denver.
In 1964...hail to 3/4 inch in diameter fell at Lowry Airfield.
In 1978...a small tornado was sighted just east of Parker. No
damage was reported.
In 1989...heavy rain drenched all areas of the Front Range...
both in the foothills and adjacent plains. Amounts of 1 to
3 inches were general over the area. Damage was confined to
a few minor road washouts and some street...basement...and
crop flooding. Thunderstorm rainfall totaled 1.44 inches at
Stapleton International Airport where north winds gusted to
43 mph. Lightning struck a 250 thousand dollar home near
Nederland and started a fire which destroyed all of it
except two garages. Lightning started a fire in a home in
Evergreen. It reached the house by hitting a tree...then
traveling through a metal clothesline strung between the
tree and the building.
In 1995...thunderstorm winds gusted to 59 mph in Brighton.
Thunderstorm winds from the south-southeast gusted to 41
mph at Denver International Airport. High temperature
of 99 degrees was a new record maximum for the date in
In 1997...heavy rain caused flooding in an apartment building
in Westminster. Several residents had to be evacuated from
their apartments. A woman in Aspen Park received minor
injuries...when lightning passed through an office window
and struck her. She suffered temporary blindness for about
In 2003...hail as large as 1 inch in diameter pelted Conifer...
Highlands Ranch...and Franktown.
29-30 In 1997...heavy rain caused flooding and flash flooding in
central portions of Adams and Arapahoe counties. Two
homes were extensively damaged when water flooded the
basements and adjacent pasture area in Strasburg. Water
4 to 5 feet deep had pooled in the lower lying areas of
the town. A portion of Quincy Road was closed in Arapahoe
County when 4 feet of water covered the roadway.
Rainfall totaled 3.06 inches at Denver International
Airport...establishing a new record for 24-hour rainfall
in July. The previous record was 2.42 inches set in 1965
on the 24th and 25th.
30 In 1879...lightning struck a brick kiln in north Denver.
Three men were knocked senseless...but all recovered.
Rainfall in the city was only 0.09 inch.
In 1881...a thunderstorm dumped heavy rain and hail on the
city...causing street flooding and much damage. A heavy
torrent of rain fell with 1.10 inches measured in just
20 minutes. Storm total rainfall was 1.60 inches. The
rain turned streets into running streams. Wood street
crossings were torn up and washed away. The storm caused
great damage by flooding many cellars where goods were
stored. The brick yards suffered severe damage when
the heavy rainfall destroyed many unfired bricks.
In 1913...northeast winds were sustained to 41 mph with gusts
to 48 mph.
In 1939...a thunderstorm produced 0.08 inch of rainfall. This
was the only measurable precipitation of the month...making
the month the second driest July on record.
In 1961...heavy rain and lightning disrupted power lines and
caused flooding in Denver. Thunderstorm rains totaled 1.60
inches at 11th and Lincoln in central Denver.
In 1972...the temperature climbed to a high of 100 degrees at
Stapleton International Airport.
In 1983...hail 3/4 to 1 inch in diameter fell in central and
southeast Denver and in Littleton. Rainfall of 1.50 inches
occurred in just 30 minutes in Littleton. There was some
street flooding in both cities with wind gusts up to 55
In 1984...central Aurora was hit by a downpour that produced
1.80 inches of rain and sent water 2 to 3 feet deep into
some streets. Before the rain stopped later in the evening...
the storm had dropped as much as 2.80 inches of moisture on
the city. Thunderstorm rainfall totaled only 0.82 inch at
Stapleton International Airport.
In 1985...a tornado was spotted in open country 10 miles
southwest of Bennett. No damage was reported. One inch
hail was reported in south Lakewood.
In 1997...one man was killed and his girlfriend critically
injured when they were struck by lightning on the Kennedy
Golf Course in southeast Denver. Both were struck in the
head when they took refuge under a tree during a downpour.
Lightning struck a home in unincorporated Arapahoe County
east of Buckley Field. The fire started in the electrical
panel boxes...causing extensive damage to the home. Heavy
rain and hail triggered a flash flood in Boulder...which
sent water through a window of the financial aid office
on the University of Colorado campus. In addition...ceiling
tiles...carpets...and dressing rooms were damaged at the Coors
Events Center when a pipe draining rainwater broke during
the downpour. In all...10 buildings on the campus received
water damage estimated at 100 thousand dollars. Hail as
large as 1.25 inches in diameter accompanied the heavy
rain in Boulder. Thunderstorm rainfall totaled 2.71 inches
at Denver International Airport where west winds gusted
to 41 mph. This was the greatest calendar day official
precipitation ever recorded in July.
In 1998...heavy rain...up to 3 inches in an hour...caused flash
flooding problems from Castle Rock to Parker. I-25 north
of Castle Rock was closed as high waters covered sections
of the highway. Some cars were left floating in the flood
In 2001...a severe thunderstorm produced a wind gust to 70
mph at a wind sensor on the northeast corner of Denver
In 2004...a severe thunderstorm produced wind gusts to 71 mph
In 2005...the temperature climbed to a high of 101 degrees
at Denver International Airport. This was a new record
maximum temperature for the date. In addition...this was
the 7th day of the month with a high temperature of 100
degrees or more...which set a new Denver record for the most
100 degree days in a month...for a season...and in a year.