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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT TUE JUN 4 2024

...Today in metro Denver weather history...

1-4   In 1977...unusually warm weather for this early in June
        resulted in 3 maximum temperature records being equaled
        at the time:  88 degrees on the 1st...90 degrees on the 2nd...
        and 93 degrees on the 4th.  Maximum of 91 degrees on the
        3rd was not a record.
2-4   In 1989...from the 2nd to the 4th...heavy rain drenched metro
        Denver with the greatest amounts recorded on the 3rd.
        Total rainfall ranged from 1 1/2 to 3 inches.  Roads were
        washed out in Boulder County...and flooded basements caused
        water damage to houses in the Gunbarrel section of Boulder.
        In suburban Denver...heavy rain caused minor flooding along
        Lena Gulch in Jefferson County where two mobile home parks
        were evacuated. Rainfall totaled 1.66 inches at Stapleton
        International Airport.
2-7   In 1921...heavy rainfall for nearly a week...from the 2nd to
        the 7th...on top of streams already swollen by mountain
        snowmelt...produced widespread flooding over the South
        Platte River basin...including the tributaries through the
        canyons to the west and southwest of Denver.  Heavy
        rainfall over the 6-day period totaled 3.36 inches in
        Boulder...4.98 inches in Morrison...4.27 inches
        in Castle Rock...and 2.94 inches in the City of Denver.
        Rainfall amounts in the foothills were estimated between
        3 and 6 inches.  The narrow-gage tracks of the Colorado and
        Southern Railroad were destroyed in the Platte canyon.  From
        the mouth of the canyon through the city to near Brighton...
        the river spread from 1/2 to nearly 1 1/2 miles wide...
        flooding farm and pasture land and destroying or damaging
        many bridges.  In the city...many businesses along with as
        many as 500 homes were inundated...forcing their evacuation.
        Bridges were swept away.  The high waters flooded the rail
        yards and stock yards in lower downtown...closing three
        adjacent packing houses.  The heavy rains also caused
        flooding on Boulder Creek in Boulder on the 6th.
3-4   In 1904...a thunderstorm during the early morning of the
        3rd turned into widespread general rain...which continued
        into the early afternoon of the 4th.  Rainfall totaled
        2.04 inches.
4     In 1878...a "waterspout" or cloudburst of rain was sighted
        up the South Platte Canyon at around noon.  The resulting
        high waters on the South Platte River slightly damaged a
        railroad bridge in the city.
      In 1937...a trace of snow fell in downtown Denver where
        rainfall totaled 0.25 inch.  Minimum temperature of 34
        degrees was a record low for the date.  Northeast winds
        were sustained to 22 mph.
      In 1951...the start of the second shortest snow-free period
        on record...109 days...occurred with the last snow of the
        season...a trace...on the 3rd.  The first snow of the next
        season occurred on September 21st when 4.2 inches of snow
        fell at Stapleton Airport.
      In 1954...a microburst produced brief sustained winds of 40
        mph with gusts as high as 64 mph at Stapleton Airport.
      In 1956...the failure of the Georgetown Dam caused downstream
        flooding on Clear Creek at Idaho Springs and Golden.
      In 1976...funnel clouds were sighted near Brighton...Erie...and
        Dacono...all north of Denver.  A tornado touched down briefly
        1 1/2 miles east of Lafayette.  Another tornado touched down
        briefly at Hyland Hills Golf Course in Westminster.  No
        damage was reported.
      In 1983...severe thunderstorms during the afternoon produced
        3/4 inch hail in south Denver...golf ball size hail 5 miles
        west of Parker...1 1/4 inch hail in Littleton...1 1/2 inch
        hail in south Aurora.
      In 2001...hail as large as 1 inch in diameter fell 17 miles
        north of Bennett in Adams County.
      In 2005...snow was mixed with rain for nearly an hour at
        Denver International Airport during mid to late morning.
        The temperature at the time was 45 degrees.  Precipitation
        totaled 0.36 inch for the day.  Northwest winds gusted
        to 37 mph.
      In 2008...a severe thunderstorm produced large hail...up to
        1 3/4 inches in diameter in Arvada...a northwest suburb of
        Denver.  Several vehicles were damaged.  In addition...a
        severe thunderstorms produced hail to 1 inch in diameter...
        10 miles northeast of Manila...east of Denver International
        Airport.
      In 2015...severe thunderstorms broke out across Boulder...
        Denver...Elbert...Jefferson and southern Larimer Counties.
        Two large and long lived tornadoes developed near Berthoud
        and near Simla. The tornado that occurred along the Boulder
        and Larimer county line.  It first touched about 3 miles
        south of Berthoud...and then tracked to the west/northwest
        and lifted about 6 miles southwest of Berthoud. The
        majority of the damage was EF1...with some areas of EF2...
        and a few small areas of EF3. At least 25 homes between
        Longmont and Berthoud were damaged; three of them
        destroyed. No injuries were reported as the winds tore
        apart homes and rolled vehicles. The EF3 rating is
        defined as maximum winds estimated at 135 to 140 mph. The
        path length was 6 miles long with a width of one
        quarter mile at times. Large hail from quarter to tennis
        tennis ball size was observed.  The largest hail occurred
        in northeast Boulder County. The hail damaged cars and
        homes; breaking windows and windshields.  In addition...
        numerous roads were closed along the Larimer and Boulder
        county line due to flash flooding. Just west of Berthoud...
        3.47 inches of rain had fallen.  At Denver International
        Airport...only 0.01 inches of rainfall was recorded...
        with a peak wind gust to 35 mph from the northeast.
      In 2020...severe thunderstorms produced intense wind gusts
        across parts of Adams and Denver counties.  A peak wind
        gust of 64 mph was observed near Bennett...with a gust to
        58 mph observed at Denver International Airport.
4-5   In 1965...lightning and an 18-hour rain storm...from the 4th
        to the 5th...damaged streets and roads and telephone and
        power lines across metro Denver.  Precipitation totaled
        2.77 inches at Stapleton International Airport where the
        visibility was reduced to 3 miles at times from
        pre-frontal thunderstorms and heavy upslope rains.
      In 1998...from the 4th to the 5th...a late season snow storm
        struck the Front Range foothills.  Up to 5 inches of snow
        fell in Coal Creek Canyon.  Light snow also fell over
        western sections of metro Denver and briefly at Denver
        International Airport. Snow covered the grass at the
        Denver Federal Center in Lakewood before melting around
        mid-morning on the 5th. No snow fell at the site of the
        former Stapleton International Airport.  Several
        temperature records were set.  High temperatures of 47
        degrees on the 4th and 49 degrees on the 5th were record
        low maximums for their respective dates.  Minimum
        temperature of 34 degrees on both the 5th and 6th were
        record lows for those dates.

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