Public Information Statement
Issued by NWS Denver/Boulder, CO

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NOUS45 KBOU 070045

Public Information Statement
National Weather Service Denver/Boulder CO
645 PM MDT SAT MAY 6 2017

...This week in metro Denver weather history...

4-8   In 1969...heavy rains caused flooding on Boulder Creek
        in Boulder...which resulted in one death on the 7th.
        Flooding also occurred on Bear Creek in Sheridan and
        on the South Platte River in Denver.  Rain over most
        of the eastern foothills started late on the 4th and
        continued with only brief interruptions in many areas
        until the morning of the 8th.  Very high rates of
        rainfall occurred on the 6th and 7th with the greatest
        intensities in a band along the foothills from about 25
        miles southwest of Denver northward to Estes Park.  Storm
        totals by both official and unofficial measurements
        exceeded 10 inches over much of this area and were over 12
        inches in some localities.  Heavy snow fell in the higher
        mountains and in the foothills later in the period.  The
        saturation of the soil resulted in numerous rock and land
        slides...and the heavy run-off caused severe damage along
        many streams and flooding on the South Platte River.  Many
        foothill communities were isolated as highways were blocked
        and communications disrupted.  Roads were severely damaged
        over a wide area...and a large number of bridges washed out.
        Many roads were closed due to the danger from falling
        rocks.  A building in Georgetown collapsed from the weight
        of heavy wet snow.  In Boulder...a man drowned when caught
        by the flooding waters of Boulder Creek...and a patrolman was
        injured.  Rainfall totaled 7.60 inches in Boulder with
        9.34 inches recorded at the Public Service Company electric
        plant in Boulder Canyon.  In Morrison...rainfall totaled
        11.27 inches in 4 days.  Heavy rainfall totaled 4.68 inches
        at Stapleton International Airport over 3 days from the 5th
        through the 7th.  Rainfall of 3.14 inches was recorded in 24
        hours on the 6th and 7th.  Downstream flooding continued
        along the South Platte River until the 12th when the flood
        crest reached the Nebraska line.
6-7   In 1873...snowfall totaled 8.9 inches in downtown Denver.
        Most of the snow fell on the 6th.
7     In 1904...west winds were sustained to 48 mph with gusts to
        60 mph.  A shower produced 0.16 inch of rain.
      In 1953...a microburst caused a brief wind gust to 58 mph at
        Stapleton Airport.
      In 1958...3/4 inch diameter hail fell over south metro Denver...
        10 miles southwest of Stapleton Airport.
      In size hail damaged windows in Wheat Ridge.
        Hail was 4 inches deep on the ground in Arvada.  Hail 3/4
        to 1 inch diameter fell in Westminster and Kittredge.
      In 1990...a fast moving cold front produced wind gusts of 40
        to 60 mph.  Brighton reported a wind gust to 57 mph...while
        north wind gusts to 44 mph were measured at Stapleton
        International Airport.
      In 1995...severe thunderstorms struck Aurora.  Hail piled 4 to
        5 inches deep in the vicinity of Quincy Reservoir in south
        Aurora.  Lightning struck an Aurora Police communications
        tower causing significant malfunction to the primary
        system.  Minor damage was sustained when lightning struck
        an apartment building.  Hail...up to 1 1/4 inches in
        diameter...while soft and slushy...accumulated up to 6 inches
        deep in 15 minutes.  Many streets were closed for an hour
        or more due to flooding caused by heavy rain and melting
        hail stones.  Some trees were stripped of their leaves.
        Hail as large as 1/2 inch diameter was measured at Denver
        International Airport where a funnel cloud was sighted.
      In 2003...a tornado touched down briefly near Bennett...but
        did no reported damage.
      In 2005...severe thunderstorms produced 3/4 inch hail near
        Brighton and a thunderstorm wind gust to 60 mph near
        Fort Lupton.
      In 2014...severe thunderstorms produced large hail...from 1 to
        1 1/2 inches in diameter...across parts of Arvada...Broomfield...
        Dacono...Northglenn and Thornton.
7-8   In 1958...rainfall totaled 2.50 inches at Stapleton Airport.
8     In 1873...a very light rain fell until 5:00 AM...when it
        turned into light snow and sleet and was accompanied by
        brisk northeast winds.  The snow froze as it fell...
        breaking the telegraph lines in many places.
        Precipitation totaled only 0.14 inch in the city.
      In 1883...a severe rain and hailstorm struck the city.  In
        25 minutes the hail was 5 inches deep in the vicinity of
        the weather office in downtown Denver and reported as
        deep as 10 to 12 inches in other parts of the city.
        Gutters were blocked by the hail...and many cellars were
        flooded.  Precipitation from the storm was 1.90 inches
        with the total for the day recorded at 2.02 inches.  The
        size of the hail was not recorded.
      In 1988...a wind gust to 68 mph was recorded at Echo Lake.
        Northwest winds gusted to 35 mph at Stapleton Airport.
      In 1995...high winds of unknown strength blew a camper shell
        from the back of a pickup truck near Fort Lupton.  North
        winds gusted to 49 mph at Denver International Airport.
      In 1996...1 to 2 inch diameter hail was measured in
        Lochbuie northeast of Denver.  Bean size hail fell in
        Brighton.  The large hail fell from severe thunderstorms
        to the northeast of metro Denver.
      In 2003...tornadoes touched down briefly near Brighton...
        Watkins...and Strasburg...but did no reported damage.
        Hail to 3/4 inch in diameter was measured near Hudson.
8-9   In 1957...intense heavy rain caused flash flooding on Toll
        Gate Creek in Aurora where 3 people were killed in a car.
        Up to 4 inches of rain fell in 5 hours in the Toll Gate
        Creek basin.  The rain also caused flash flooding on Sand
        Creek in Aurora and Denver.  Rainfall totaled 3.29 inches
        at Stapleton Airport with most of the rain...2.34 inches...
        occurring on the 9th.
8-10  In 1979...4.3 inches of snow fell at Stapleton International
        Airport where northwest winds gusted to 30 mph on the 8th.
        Most of the snowfall...2.3 inches...occurred on the 9th.
        High temperature of only 35 degrees on the 9th equaled the
        record low maximum for the date.
9     In 1875...a heavy windstorm swept across the city for most
        of the day.  West-northwest winds averaged a sustained
        speed of 31 mph between 6:00 AM and 3:00 PM.  The peak
        wind was sustained to 45 mph at 9:50 AM.
      In winds were sustained to 40 mph with
        gusts as high as 43 mph.  Only a trace of rain fell.
      In 1941...a tornado was noted at 2:20 PM to the northeast
        of downtown and was followed by another similar shaped
        cloud or dust roll estimated 3 miles behind.  Thick dust
        followed with heavy gusts of wind.  The temperature fell
        15 degrees in 10 minutes following the twister.  The mild
        tornado did little damage except to unprotected frame
        structures.  Winds were sustained to 50 mph with the
        passing of the tornado at Stapleton Airport.  It was
        visible to observers for 10 minutes and was lost from
        sight as it traveled east into huge rolls of dust.  Hail
        and rain followed with a few hailstones as large as 1/2
        inch in diameter downtown.  No damage was reported from
        the hail.  Thunderstorm winds sustained to 31 mph produced
        blowing dust downtown.  Precipitation was only 0.07 inch.
      In 1983...streams swollen by recent rain and snowmelt caused
        an earthen dam to collapse...washing out portions of State
        Highway 67 near Deckers in southern Douglas county.
      In 1992...three boys...ages 11...12...and 16...were struck by
        lightning while taking cover under a large tree during a
        thunderstorm in Jefferson County...just 7 miles northwest
        of Denver.  The three were seriously injured.
9-10  In 1889...heavy rainfall totaled 2.15 inches in downtown
        Denver.  The cold rain was mixed with snow at times
        overnight.  Temperatures on the 10th ranged from a
        high of 38 degrees to a low of 32 degrees with north
        winds sustained to 22 mph.
      In 2003...a late spring snowstorm hammered the mountains...
        eastern foothills...and urban corridor.  The heaviest
        snowfall occurred north of Interstate 70.  The heavy
        wet snow caused damage to trees throughout metro Denver
        and downed power lines.  About 40 thousand people along
        the urban corridor were without power.  Storm total
        snowfall amounts included:  11.5 inches in Louisville...
        8 inches in Boulder and Broomfield; 7 inches in Denver International Airport...
        and at the site of the former Stapleton International
        Airport; and 6 inches 4 miles east of Denver.  Snowfall
        ranged from 4 to 9 inches across extreme southern Weld
        County.  In the foothills...15 inches of snow fell near
        Jamestown...9 inches at Rollinsville and Rawah...with
        8 inches at Chief Hosa and atop Lookout Mountain.
        The snow was accompanied by thunder on the afternoon
        of the 9th at Denver International Airport where west
        winds gusted to 25 mph on the 9th and north winds gusted
        to 22 mph on the 10th.
10    In 1875...a windstorm sand-blasted the city from 10:00 AM
        until midnight.  Northwest winds sustained to 60 mph
        brought clouds of sand...which caused high damage to
        unfinished buildings.
      In 1912...a vigorous cold front produced strong north winds
        and rain.  North winds were sustained to 48 mph with gusts
        as high as 60 mph.  Rainfall totaled 1.10 inch.
      In precipitation occurred...making this one of
        only two days without precipitation during the entire
        month.  The other day was the 21st.  Precipitation
        totaled 4.95 inches for the month.
      In 1956...northwest winds gusted to 53 mph at Stapleton
        Airport where the visibility was briefly reduced to 1/2
        mile in blowing dust.
      In 1974...strong winds caused 30 thousand dollars in damage
        to a building under construction in Lakewood.  Microburst
        winds gusted to 46 mph at Stapleton International Airport.
      In 1988...lightning struck a house in Boulder...setting it
        afire.  The house...valued at 170 thousand dollars...was a
        total loss.
      In ball size hail fell over southeast Denver near
        the junction of I-25 and I-225.  Hail to 3/4 inch in
        diameter fell over southeast Aurora.  Only 3/8 inch hail
        fell at Stapleton International Airport.
      In 1991...high winds up to 63 mph raked the eastern foothills.
        Winds estimated to 50 mph tore a roof from a home in
        Lafayette.  A tower at Jefferson County Stadium in west
        metro Denver was blown over by the high winds.  No
        injuries were reported.  Southeast winds gusting to 48 mph
        at Stapleton International Airport produced some blowing
        dust.  The temperature climbed to a high of 86 degrees...
        equaling the record maximum for the date.
      In 2005...severe thunderstorms produced hail as large as
        2 inches in diameter in and near Longmont.
10-11 In snowfall totaled 4.7 inches in downtown
        Denver.  Northwest winds gusted to 19 mph on the 10th.
      In 1923...winds were strong and gusty on both days.  Northwest
        winds were sustained to 40 mph with gusts to 44 mph on the
        10th.  North winds were sustained to 39 mph with gusts to
        46 mph behind an apparent cold front on the 11th.
10-12 In 2011...a spring snowstorm brought heavy snow to the Front
        Range Foothills and Palmer Divide. Storm totals included:
        18 inches...4 miles south-southeast of Pinecliffe; 16 inches
        in Coal Creek Canyon; 15 inches...4 miles west-southwest of
        Eldorado Springs; 13 inches at Gold Hill...12 inches...4
        miles west-southwest of Conifer and 4 miles northwest of
        Elizabeth; 11.5 inches...6 miles southwest of Evergreen and
        4 miles east-northeast of Nederland; 11 inches...3 miles
        east of Jamestown and 10.5 inches...3 miles east of
        Franktown and 3 miles south of Golden and 10 inches...10
        miles north of Elizabeth. At Denver International Airport...
        1 inch of snowfall was observed.
11    In apparent cold front during the afternoon produced
        sustained north winds as high as 60 mph and great clouds of
        blowing dust.  The dust filled the air until the thunderstorm
        rain began...which produced 1.46 inches of rainfall.  The rain
        ended during the evening.
      In 1900...southwest winds were sustained to 40 mph with gusts
        to 46 mph.
      In 1958...a microburst caused a brief wind gust to 55 mph at
        Stapleton Airport.
      In 1963...south-southwest winds gusted to 48 mph at Stapleton
        Airport.  Winds may have been stronger over west Denver
        where some buildings were damaged.
      In 1998...large hail fell over south metro Denver.  Hail
        as large as 1 1/4 inches in diameter was measured in
        Parker with 1 inch hail recorded in Littleton and 4 miles
        south of Lakewood in Jefferson County.  Hail to 3/4 inch
        diameter was measured in Douglas County...11 miles west-
        northwest of Parker.
11-12 In 2014...A strong storm system moved from southwest Colorado
        and produced heavy snow in and near the Front Range Foothills
        and metro Denver.  The snow was heaviest in the foothills
        where up to 2 1/2 feet of snow was observed. In the foothills...
        storm totals included: 30 inches near Pinecliffe; 29 inches...
        8 miles northeast of Four Corners; 28 inches near Pingree
        Park; 27 inches near Allenspark; 20.5 inches near Idaho
        Springs; 19.5 inches at Gold Hill; 19 inches near Genesee; 18
        inches near Blackhawk; 17 inches at Aspen Springs; 16.5 inches
        near Ward; 13.5 inches at Bergen Park; with 11 inches at
        Evergreen.  Along Urban Corridor and Palmer Divide...storm
        totals included: 10.5 inches at Eldorado Springs; 10 inches at
        Ken Caryl; 9 inches at Superior; 8 inches near Morrison; 7.5
        inches in Broomfield and Highlands Ranch; 7 inches in Denver...
        near Franktown...Golden...Lakewood and Highlands Ranch; 6
        inches...5 miles northeast of Westminster...7 miles south of
        Lyons and near Parker; with 5.5 inches at Aurora. At Denver
        International Airport...1.1 inches of snowfall was observed...
        along with 0.9 inches of water.
12    In 1875...two forest fires on the eastern slope of the
        foothills were visible from the city.
      In 1904...north winds were sustained to 40 mph with gusts
        to 48 mph.
      In 1950...brilliant and complete primary and secondary
        rainbows arching across the sky were observed from
        Stapleton Airport.
      In 1951...a wind gust to 51 mph was recorded at Stapleton
      In 1984...winds gusted to 69 mph in Boulder.  Northwest winds
        gusted to 47 mph at Stapleton International Airport.
      In 1987...a small weak tornado touched down for about 2
        minutes in southeast Denver.  The twister hit a car
        dealership...blowing about a dozen windows out of cars and
        shattering four skylights on the building.  Some tin
        roofing was blown off a patio a block and a half away.  The
        tornado also downed a power pole.  Damage at the dealership
        was estimated at 10 thousand dollars.  A man was slightly
        injured by lightning in northwest Aurora.
      In 1995...several funnel clouds were sighted near Parker.
        One of the funnels produced a short-lived debris cloud
        on the ground in an open field.  No damage was reported.
12-13 In 1907...the temperature warmed to a high of 73 degrees on
        the 12th...before a cold front produced a thunderstorm...
        northeast winds sustained to 40 mph...and rain changing to
        light snow overnight.  Snowfall totaled only 2 inches...but
        the high temperature on the 13th was only 39 degrees.
      In 1961...a storm that covered metro Denver with rain and snow
        started as thunderstorms on the evening of the 12th.  Hail
        to 1 1/2 inches in diameter was reported 10 miles northwest
        of Stapleton Airport.  Rain continued overnight and changed
        to snow on the 13th.  Snowfall totaled 6.4 inches and
        precipitation (rain and melted snow) 1.96 inches at
        Stapleton Airport where north winds gusted to 39 mph.  The
        rain and heavy wet snow caused icing damage to utility
        lines.  Heavy snow occurred in the foothills.
      In 1982...a major storm dumped 1.50 to 3.50 inches of rain
        across northeast Colorado and deposited prodigious amounts
        of snow in the foothills.  Coal Creek Canyon southwest of
        Boulder was buried under 46 inches of snow with 39 inches
        at Nederland.  The heavy wet snow downed many powerlines in
        the foothills.  In Thornton...the roof of a school was
        damaged by water from the heavy rain.  At Stapleton
        International Airport...1.49 inches of rain were measured
        over the two day period.  The heavy rain ended a severe and
        prolonged drought.
      In 2004...a winter storm produced heavy snow in excess of a
        foot in the foothills above 6 thousand feet while heavy
        rain fell across the city.  The heaviest snow occurred in
        the high country of Boulder County.  Storm total snowfall
        was 14.5 inches near Jamestown.  Rainfall totaled 0.81 inch
        at Denver International Airport with 0.94 inch recorded at
        Denver Stapleton.  A trace of snow was recorded at both
        locations.  East winds gusted to 24 mph at Denver
        International Airport on the 12th.
13    In 1905...a thunderstorm produced hail during the late
        afternoon.  Precipitation totaled 0.57 inch.
13-14 In 1912...heavy snowfall totaled 12.4 inches over the city.
        Most of the snow...9.9 inches...fell on the 13th...which was
        the greatest 24 hour snowfall in May at the time.  This
        was the last snowfall of the season.  The low temperature
        dipped to 27 degrees on the morning of the 14th.
      In 1989...a spring storm brought heavy rain and snow to the
        foothills.  Metro Denver was soaked with 1 to 2 inches
        of rain.  Rainfall totaled 1.26 inches at Stapleton
        International Airport.  In the foothills...Echo Lake
        received 20 inches of snow.  A 30-ton boulder slid onto
        I-70 east of the Eisenhower Tunnel...closing the freeway
        for 2 hours.

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