Current Watches and Warnings
Colorado, Logan County
Public Information Statement
Statement as of 6:45 PM MDT on September 20, 2014
... This week in Metro Denver weather history...
20-21 in 1963... heavy rain and hail caused local flooding in
southeast Denver. Thunderstorm rainfall was only
0.60 inch at Stapleton Airport on the 20th.
In 1983... the cold front on the 19th brought an unusually cold
air mass into Metro Denver for so early in the season. The
temperature dipped to a daily record minimum of 28 degrees
on both days.
In 1995... a vigorous late Summer storm brought the season's
first heavy snow to portions of Metro Denver. Millions
of trees were damaged and power lines downed as 4 to 8
inches of heavy wet snow settled on fully leafed trees in
the Boulder and Denver areas. Branches snapped and trees
split under the weight of heavy snow... Downing power lines.
Firefighters responded to numerous transformer fires.
Around 100 thousand people were left without electricity
in Boulder and Denver areas alone. It took over a week
to fully restore power to some areas. Insurance claims
were estimated to be around 6 million dollars to homes
in Metro Denver and about 500 thousand dollars in damage
to automobiles. It was estimated that about 80 percent
of 125 million dollars Worth of city owned trees in Denver
were damaged. Snowfall totaled 7.4 inches at the site of
the former Stapleton International Airport where the
greatest depth of snow on the ground was only 4 inches
due to melting. Temperature records were set on the
21st when the thermometer dipped to a record low reading
of 27 degrees and climbed to a high of only 36 degrees...
setting a record low maximum for the date. North winds
gusted to 29 mph at Denver International Airport on the
20-22 in 1902... a thunderstorm on the 20th... in advance of an
apparent cold front... produced rain... hail... and northwest
winds to 40 mph with gusts to 48 mph. Widespread rain
developed behind the cold front and totaled 3.21 inches
from the evening of the 20th through the early afternoon
of the 22nd. The 2.70 inches of precipitation recorded
from 800 PM on the 20th to 800 PM on the 21st is the
greatest 24 hour precipitation ever recorded in the
month of September. The temperature dipped from a high
of 80 degrees on the 20th to a high of only 51 degrees
on the 21st.
21 in 1951... 4.2 inches of snow fell at Stapleton Airport...
where northeast winds gusted to 27 mph. This was the
first snowfall of the season in Denver... marking the end
of the second shortest snow-free period on record... 109
days... from June 4th through September 20th. A trace of
snow fell on June 3rd.
In 1984... thunderstorm winds gusted to 56 mph at Stapleton
In 1992... the only precipitation of the month at Stapleton
International Airport... 0.01 inch of rain... fell from a
brief shower around daybreak.
In 2009... an early season storm brought moderate to heavy
snow to the foothills of Clear Creek... Jefferson and park
counties... west and southwest of Denver. A trained
spotter... 4 miles west-northwest of Conifer... was the big
Winner with 14 inches of snow. Storm totals elsewhere
generally ranged from 5 to 10 inches.
21-22 in 1870... strong winds occurred in the foothills and in
Boulder and Denver.
In 1895... rain changed to snow overnight and totaled 11.4
inches in downtown Denver. This was the first snowfall
of the season and the second heaviest first snowfall of
the season on record. North winds were sustained to 27
mph with gusts to 30 mph on the 21st.
22 in 1913... a thunderstorm produced northwest winds sustained
to 40 mph with gusts to 44 mph.
In 1946... a trace of snow fell in downtown Denver. This
marked the start of the longest snow season on record...
263 days through June 11... 1947... when a trace of snow
23 in 1873... north to northwest winds blowing almost a gale
spread clouds of dust and sand into the city during the
afternoon and evening. From the roof of the weather
observer's building... houses a few hundred yards away were
not visible and not even the sky could be seen through the
clouds of sand. The wind reached sustained speeds of 35
mph... but only 28 mph was registered for any one hour.
In 1977... wind gusts from 50 to 80 mph were reported along the
foothills. A northwest wind gust to 53 mph was recorded at
Stapleton International Airport.
23-24 in 2000... the first snowstorm of the season brought heavy
snow to areas in and near the foothills. While the
heaviest snow fell north of Metro Denver... 6 inches were
measured in Boulder... 4 inches at both Castle Rock and
Morrison... but only 0.2 inch at the site of the former
Stapleton International Airport where most of the
precipitation fell as rain. At Denver International
Airport where drizzle and rain fell on the 23rd...
snowfall during the early morning of the 24th was
estimated at 2.1 inches due to melting. The foothills
west of Denver received more snow with 10 inches measured
at Conifer... 9 inches 11 miles southwest of Morrison...
8 inches atop Crow Hill... 7 inches at chief hosa... and
5 inches at Ralston Reservoir.
24 in 1901... northwest winds were sustained to 50 mph with
gusts as high as 57 mph in the city.
In 1932... thunderstorm rainfall of only 0.11 inch was the
only measurable precipitation for the month that year
in the city.
In 1986... a very strong wind storm roared across Metro
Denver. Boulder was hit hardest. Winds peaked to 131 mph
at the National center for atmospheric research. This is
thought to be the highest wind gust ever recorded in Boulder
during September. A wind gust to 118 mph was clocked on
Davidson Mesa and to 92 mph near Niwot. Gusts of 70 to 80
mph were common over all of Boulder where an estimated 70
to 90 large trees were uprooted. About a dozen of them hit
cars. Two walls of a building under construction were
toppled and solar panels were blown off a house. Traffic
lights and power lines were downed. Damage to power
equipment alone was estimated at 100 thousand dollars.
Wind gusts to 87 mph at Jefferson County Airport damaged
two planes. A woman was seriously injured in Boulder.
She suffered a fractured skull when struck by a falling
tree limb. Trees were also downed in Louisville and
Lafayette. West wind gusts to 45 mph were recorded at
Stapleton International Airport.
25 in 1873... a fire was sighted in the Woods near Platte Canyon...
probably caused by high winds blowing Sparks among the
In 1896... an apparent cold front produced northeast sustained
winds to 40 mph with gusts to 48 mph.
In 1910... a thunderstorm produced sustained north winds to
51 mph. This was the highest recorded wind speed in the
city in September at the time.
In 1936... a vigorous cold front produced a deadly dust storm
in the city. North winds sustained to 36 mph with gusts
to 38 mph produced much blowing dense dust... greatly
restricting the visibility. The temperature plunged from
a high of 84 degrees to a low of 38 degrees by midnight.
The weather observer described the event with the following.
"At 6:00 PM the temperature was 82 degrees and the wind
velocity was only 4 mph; but with the wind shifting to the
north and the barometer rising quite rapidly... the temperature
fell sharply. By 6:30 PM... the wind velocity increased
rapidly and by 7:00 PM had reached a maximum sustained
velocity of 36 mph... bringing with it clouds of dust which
had been picked up by gale force winds in southern Wyoming
and northern Colorado... covering the city. The visibility
was generally reduced to about 1/4 mile; however... the
whirling of the dust down the streets and alleys... the
visibility was at times somewhat less. Airplanes were
grounded... traffic was halted at times... and homes filled
with dust. The strong winds damaged electric power and
telephone lines... leaving homes in darkness for a few hours
in the city and for 18 hours in suburban towns and putting
2500 telephones out of service because of broken lines. An
electric lineman was killed while repairing damage by the
high winds. The dust storm was followed by rain that began
falling at 10:55 PM... which turned to snow during the early
morning hours of the 26th. A major snow storm followed on
the 27th through the 29th."
In 1999... high winds developed in the foothills of Boulder
County. Winds gusted to 90 mph at Wondervu.
25-26 in 1908... apparent Post-frontal rain changed to snow overnight
and totaled 6.5 inches in downtown Denver. This was the
first snow of the season. Precipitation totaled 0.76 inch.
North winds were sustained to 39 mph on the 25th.
25-27 in 1996... an early season snowstorm brought heavy snow
to the Front Range eastern foothills. Snowfall totals
included: 8 to 12 inches around Conifer... 7 inches on
Floyd hill... and 6 inches at both Bailey and chief hosa.
Snowfall totaled only 4.7 inches at the site of the
former Stapleton International Airport. This was the
first measurable snow of the season. After the passage
of a strong cold front... north winds gusted to 38 mph at
Denver International Airport on the 25th.
26 in 1907... a late afternoon thunderstorm produced hail... 0.23
inch of precipitation... and north winds sustained to 24 mph.
In 1927... snowfall of 1.7 inches... mixed at times with sleet...
was the first measurable snowfall of the season.
In 2012... a man was seriously injured when he was struck by
lightning outside the hebrew educational Alliance as he
and his family were getting in their car. The victim
stopped breathing but was saved when his wife performed
cardiopulmonary resuscitation on him immediately
following the lightning strike. He suffered Burns to 15
percent of his body which included his legs... chest...
abdomen and neck. Lightning also caused 48 outages in
Denver which affected 6582 xcel energy customers.
26-28 in 1936... the heaviest snowfall ever recorded in September
and the heaviest snowfall ever recorded so early in the
season dumped a total of 16.5 inches of snow on downtown
Denver and 21.3 inches at Denver Municipal Airport. The
15.0 inches of snow measured from 6:00 PM on the 27th to
6:00 PM on the 28th is the greatest 24 hour snowfall ever
recorded in September. This was the first snow of the
season. The snow was intermittent through the 26th... but
continuous from early afternoon on the 27th to around
midnight on the 28th... except for a period of rain during
the afternoon of the 28th which contributed to a loss of
depth on the ground. The greatest snow depth on the ground
downtown was 13 inches with 8 inches at Denver Municipal
Airport. There were no high winds with the storm and
traffic was interrupted for only a short period. The
storm produced property damage estimated at 7 million
dollars. With trees and shrubs in full foliage... the leaves
caught and held the heavy water-laden snow... until the
branches snapped from the weight. More than 3000 workmen
were called to remove the debris and snow from the city. The
city firemen who were off duty... as well as all the reserves...
were asked to report to their stations. All schools in the
city remained open... but attendance was only 50 percent of
normal. Grade school students were sent home at noon on the
28th. The early storm caught stockmen with many cattle still
in higher ranges. Warm weather followed the snow... which had
all melted by the end of the month... except for a few inches
in sheltered places.
27 in 1877... smoke from heavy Forest fires in the mountains
spread over the city on upper wind currents.
In 1935... the first snow of the season was 2.8 inches in
downtown Denver. The low temperature dipped to 31
degrees for the first freeze of the season.
27-28 in 1984... heavy snow fell over the plains and foothills.
Snowfall amounts ranged from 2 to 5 inches on the plains
with up to a foot at higher elevations in the foothills.
The main problem caused by the storm was thousands of
power outages caused by snow-laden tree limbs snapping and
falling onto power lines. Over 15 thousand homes lost
power in Metro Denver. Some cars were damaged by falling
trees and limbs. The snow also caused some flight delays
at Stapleton International Airport where 5.1 inches of
snow fell and northeast winds gusted to 29 mph. Maximum
snow depth on the ground was 3 inches due to melting. The
high temperature of only 34 degrees on the 28th was a
record low maximum for the date and equaled the all-time
record for the month at that time.
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