Public Information Statement
Issued by NWS Denver/Boulder, CO
NOUS45 KBOU 230859
Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT SUN APR 23 2017
...Today in metro Denver weather history...
20-23 In 1989...unusually warm weather resulted in several daily
temperature records being broken in Denver. The high
temperature of 89 degrees on the 21st exceeded the record
maximum for the month at that time. Daily record high
temperatures were either exceeded or equaled with 83
degrees on the 20th...88 degrees on the 22nd...and 85
degrees on the 23rd. The low temperature of 55 degrees
on the 22nd equaled the record high minimum for the date.
21-23 In 1999...a spring snowstorm dumped heavy snowfall over metro
Denver and in the foothills. Nearly 3 feet of snow fell
in the foothills with over a foot in the city. The heavy
wet snow downed power lines in Douglas and Elbert counties.
Scattered outages were reported at Parker...Franktown...
Sedalia...and Castle Rock. Some residents were without
electricity for as long as 20 hours. The inclement weather
was blamed...at least in part...for several traffic accidents
along the I-25 corridor between Denver and Castle Rock.
Snowfall totals included: 32 inches at Idaho Springs; 31
inches on Crowhill; 29 inches near Evergreen; 26 inches at
Chief Hosa and Coal Creek Canyon; 25 inches at Bailey; 24
inches at Floyd Hill; 23 inches at Conifer...Genesee...Golden
Gate Canyon...North Turkey Creek...and Pine Junction; 13
inches at Broomfield and near Sedalia; 12 inches in
Boulder; 11 inches at Louisville and Parker; and 9 inches
at the site of the former Stapleton International Airport.
In 2004...heavy snow fell across metro Denver...when low level
upslope conditions developed against the foothills and
Palmer Divide. Snowfall totals included: 18 inches in the
foothills southwest of Boulder...17 inches at Intercanyon and
near Conifer...10 inches near Blackhawk and Parker...9 inches
at Castle Rock and near Sedalia...7 inches in Centennial...
Littleton...and near Lone Tree. Elsewhere across metro
Denver...snowfall generally ranged from 2 to 5 inches.
Snowfall was 4.7 inches at Denver Stapleton. Northwest
winds gusted to 35 mph at Denver International Airport
on the 21st.
22-23 In 1885...the worst snow storm since station records began in
1872 dumped a total of 24.0 inches of snowfall on the city.
The 23.0 inches of snow recorded on the 22nd and 23rd was
the greatest 24-hour snowfall ever recorded during the
month of April. Streets were impassable...roofs caved in...
telegraph and telephone wires were downed...railroads were
blocked and trains delayed...and most business came to a
complete standstill. Estimated losses were reported to
50 thousand dollars. The total snowfall was partly
estimated due to melting. Precipitation from the storm
totaled 2.79 inches.
In 1915...post-frontal rain during the day and overnight
totaled 2.00 inches. Most of the rain fell on the 22nd.
In 1945...6.7 inches of snow fell over downtown Denver. This
was the third major snow in a little over 3 weeks...which
made this month the 4th snowiest on record. Northeast winds
were sustained to 25 mph and light hail fell on the 22nd.
In 2013...a spring storm brought heavy snow to the mountains...
with period of moderate to heavy snow to portions of the
Front Range Foothills and Urban Corridor. In the mountains
and foothills...storm totals included: 18 inches at Niwot
Ridge SNOTEL; 16.5 inches near Ward; 13 inches at Arapahoe
Basin and Roach SNOTEL...12 inches near Blackhawk; 11.5
inches near Nederland; 11 inches near Allenspark and at
Loveland Ski Area; 10 inches near Idaho Springs and
Pinecliffe; with 9.5 inches and near Silverthorne. Along
the Urban Corridor storm totals included: 7.5 inches near
Morrison; 7 inches at the National Weather Service Office
in Boulder and Niwot; 6.5 inches near Arapahoe Park and
Superior; with 6 inches at Lafayette and Lakewood. At
Denver International Airport...4.7 inches of new snowfall
22-24 In 2010...a potent spring storm brought heavy...wet snow to
areas in and near the Front Range Foothills and widespread
rainfall across the adjacent plains. In the Front Range
Foothills and North-Central Mountains east of the
Continental Divide...storm totals ranged from 15 to 30
inches. Storm totals included: 29.5 inches...3 miles
southeast of Pinecliffe; 27 inches...8 miles northeast
of Four Corners; 23 inches at Willow Creek; 22.5 inches...
13 miles northwest of Golden; 21 inches at Never Summer;
17 inches at Eldorado Springs; 16.5 inches...3 miles west
of Jamestown. Denver International Airport reported just
a trace of snowfall...but measured 2.01 inches of rainfall
for the duration of the storm. In addition...a peak wind
gust to 54 mph from the northwest was observed at the
airport on the 23rd
23 In 1889...north winds were sustained to 48 mph.
In 1913...northeast winds were sustained to 46 mph with gusts
to 60 mph behind a dry cold front.
In 1914...a thunderstorm produced considerable hail and 0.29
inch of rain. West winds were sustained to 42 mph with
gusts to 48 mph.
In 1942...hail of unknown size fell over the city.
In 1958...a funnel cloud was sighted for 20 minutes...15 miles
southeast of Stapleton Airport. The funnel formed in
advance of a thunderstorm and hung about a thousand feet
below the base of the cloud...but remained aloft. Later in
the day...3.6 inches of snow fell at Stapleton Airport.
In 2002...persistent dry conditions in the foothills
contributed to the first large forest fire of the season
near Bailey. Very dry and windy conditions allowed the
fire...initially started by a careless smoker...to grow
into a 2400-acre blaze before it could be contained.
Fortunately...no significant damage occurred to homes or
other property in the area.
In 2006...severe thunderstorms produced large hail across
metro Denver. Hail as large as 1.25 inches in diameter
fell in south Denver with hail to 0.88 inch across the
rest of the city. Hail to 1.00 inch in diameter was
reported near Morrison...in south Lakewood...and in Aurora
near Cherry Creek. Hail to 0.88 inch was measured in
Golden with 0.75 inch hail in east Lakewood.
23-24 In 1883...snowfall totaled 7.6 inches in downtown Denver.
In 1904...a thunderstorm produced hail during the late evening
of the 23rd. Apparent post-frontal rain changed to snow
during the early morning of the 24th...but totaled only 2.0
inches. Precipitation consisting of rain...melted hail...and
snow totaled 0.60 inch. Northeast winds were sustained to
41 mph with gusts as high as 52 mph on the 24th.
In 1905...rain changed to snow and totaled 8.0 inches. Much
of the snow melted as it fell with only 2.5 inches measured
on the ground. Precipitation totaled 1.88 inches.
Northeast winds were sustained to 20 mph on the 23rd.
In 1942...the South Platte River reached flood conditions in
the city. As many as 15 thousand residents were warned
to evacuate their homes temporarily. Two lives were lost
in the city. Four bridges were washed out by the flood
waters and other bridges were endangered. The damage was
generally limited to bridges that were in poor condition.
However...the flood waters did not overflow their channel
banks within the city limits.
In 1980...heavy rain began in the eastern foothills on the
night of the 23rd and turned to heavy wet snow on the 24th.
Up to a foot and a half of snow fell in the foothills west
of Denver. At Stapleton International Airport precipitation
totaled 1.58 inches...but only 3.7 inches of snow fell from
the storm. East winds gusted to 24 mph.
In 1997...locations in and near the foothills received the
greatest snow of the year as a winter-like storm system
moved into metro Denver. East to southeast winds at speeds
of 15 to 35 mph were common with even stronger gusts above
9 thousand feet. Snow fell at a rate of 2 to 3 inches an
hour as deep upslope combined with a moist and unstable
air mass. The snow began in the foothills above 7500 feet
during the evening of the 23rd. By sunrise the snow level
had dropped to 5000 feet. The hardest hit areas extended
from I-25 into the foothills. Snowfall totals in the
foothills ranged from 1 1/2 to over 3 1/2 feet. In the
city...snowfall ranged from 8 to 18 inches. Some snowfall
amounts included: 36 inches at Coal Creek Canyon; 31 inches
at Nederland and Wondervu; 20 to 24 inches near Blackhawk...
at Echo Lake...and North Turkey Creek Canyon; 15 to 19 inches
at Boulder...Central City...Conifer...Evergreen...Georgetown...
and Louisville; 8 to 14 inches in Arvada...Broomfield...
Westminster...Wheat Ridge...Castle Rock...and Ken Caryl Ranch.
Only 2.3 inches of snow fell at the site of the former
Stapleton International Airport on the 24th. East winds
gusted to 36 mph at Denver International Airport on the
In 2003...a strong and deep northerly flow circulating around
a closed upper low pressure center allowed heavy snow to
fall in the mountains and eastern foothills. Snowfall
totaled 14 inches in Idaho Springs. Rain was mixed with
snow and thunder across metro Denver. Snowfall was only
0.9 inch overnight at the site of the former Stapleton
International Airport. Precipitation totaled 1.34 inches
at Denver International Airport...where northwest winds
gusted to 55 mph on the 23rd.
In 2007...a storm system intensified over Southeast Colorado...
allowing for heavy snow and rain to develop over much of
North-Central and Northeast Colorado. Severe thunderstorms
preceded the storm system on the 23rd...affecting the Urban
Corridor. Nickel size hail was reported in Boulder and a
small landspout touched down near Byers. On the 24th...heavy
snow fell in the foothills west of Denver and Boulder...where
storm totals ranged from 1 to 2 feet. Heavy snow also
occurred along the Palmer Divide...with storm totals of 10 to
16 inches. Elsewhere...a steady moderate to heavy rainfall
was reported. Denver International Airport measured 2.09
inches of rainfall...which shattered the previous 24-hr
record of 1.29 inches for the 24th of April. The heavy wet
snow caused several power outages. In some instances it
took several days to restore power. Several road closures
were reported...including Interstates 25 and 70. A jacknifed
semi-trailer backed up traffic for nearly 20 miles...on
southbound I-25...between Denver and Colorado Springs. In
addition...a 50-ton boulder blocked the southbound lane of
State Highway 285...near Parmalee Gulch. Crews had to use
explosives to break up the boulder and clear the debris.
Stranded buses and impassable roadways also forced several
23-25 In 1935...heavy wet snow fell across metro Denver. The storm
started as rain on the 23rd and changed to snow early on the
morning of the 24th. There was continuous precipitation for
a period of 48 hours. Snowfall totaled 19.0 inches over the
city and 20.0 inches at Denver Municipal Airport. However...
due to warm temperatures in the 30`s...much of the snow
melted as it fell and did not seriously disrupt traffic.
The greatest snow accumulation on the ground downtown was
12 inches...but it quickly melted. The highest sustained
wind speed recorded during the storm was 28 mph from the
north on the 23rd. The storm contained 3.16 inches of