Alert archive / Colorado / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 14, NWS Denver/Boulder, CO

June 18, 1987Douglas County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 18, 1987, 5:42 PM MDT for Douglas County, Colorado. It was in force for 63 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 18, 1987, 5:42 PM MDT (23:42 UTC)
Expired
Jun 18, 1987, 6:45 PM MDT
In force
63 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Douglas County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jun 18, 6:06 PM MDTHail 1Douglas, CO
Jun 18, 6:25 PM MDTHail 1.75Douglas, CO
Jun 18, 6:44 PM MDTTornado F1Douglas, CO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Fort Carson/Butt, CO (KFCS), launched 12:00Z, 11.7 hours before the alert went out and 75 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Fort Carson/Butt, CO at 12:00Z on 1987-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 295 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Carson/Butt, CO at 12:00Z on 1987-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
295 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
908 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 18, 1:50 PM MDT, 3 hours 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
150PM MDT THU JUN 18 1987

...THUNDERSTORMS OVER THE NORTHEAST COLORADO FOOTHILLS...

THUNDERSTORMS WERE DEVELOPING OVER THE NORTHEAST COLORADO FOOTHILLS
THIS AFTERNOON. THE STONGEST THUNDERSTORM WAS LOCATED IN WESTERN BOULDER
COUNTY...40 MILE NORTHWEST OF DENVER.  THE THUNDERSTORMS WERE MOVING TO
THE NORTHEAST AT 15 MPH.

THE THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON MOVING OUT
OVER THE PLAINS.  A FEW OF THE THUNDERSTORMS MAY BECOME SEVERE WITH
HAIL...STRONG GUSTY WINDS...LOCALLY HEAVY RAIN AND DANGEROUS LIGHTNING.
THE HEAVY RAINS WITH THE THUNDERSTORMS THIS AFTERNOON CAN CAUSE LOCAL
FLOODING OF SMALL STREAMS AND LOW LYING AREAS...LOCAL FLOODING OF
HIGHWAYS...STREETS AND UNDERPASSES.

ALL PERSONS IN EASTERN COLORADO...INCLUDING THE GREATER DENVER
METROPOLITAN AREA...SHOULD MONITOR NOAA WEATHER RADIO OR OTHER
MASS MEDIA COMMUNICATIONS FOR THE LATEST WEATHER UPDATES.

BALINT...WSFO DENVER
Special weather statement, Jun 18, 2:56 PM MDT, 2 hours 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
255 PM MDT THU JUN 18 1987

...THUNDERSTORMS CONTINUE OVER THE NORTHEAST COLORADO FOOTHILLS...

THUNDERSTORMS CONTINUED OVER THE THE NORTHEAST COLORADO FOOTHILLS SOUTH
WEST OF DENVER NORTH TO THE WYOMING BORDER. THE STONGEST THUNDERSTORM
WAS LOCATED NEAR BOULDER IN BOULDER COUNTY...25 MILES NORTHWEST OF
DENVER.  THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 15 MPH.

THE THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON AND ARE
BEGINNING TO MOVE OUT OVER THE PLAINS.  A FEW OF THE THUNDERSTORMS MAY
BECOME SEVERE WITH HAIL...STRONG GUSTY WINDS...LOCALLY HEAVY RAIN AND
DANGEROUS LIGHTNING.

ALL PERSONS IN EASTERN COLORA`DO...INCLUDING THE GREATER DENVER
METROPOLITAN AREA...SHOULD MONITOR NOAA WEATHER RADIO OR OTHER
MASS MEDIA COMMUNICATIONS FOR THE LATEST WEATHER UPDATES.

BALINT...WSFO DENVER
Special weather statement, Jun 18, 3:55 PM MDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
355 PM MDT THU JUN 18 1987

...THUNDERSTORMS CONTINUE ALONG AND NEAR THE NORTHEAST COLORADO
   FOOTHILLS...

THUNDERSTORMS CONTINUED OVER THE THE NORTHEAST COLORADO FOOTHILLS SOUTH
WEST OF DENVER NORTH TO THE WYOMING BORDER. THE STONGEST THUNDERSTORMS
WERE LOCATED NEAR BOULDER IN BOULDER COUNTY...25 MILES NORTHWEST OF
DENVER AND OVER NORTHERN JEFFERSON COUNTY 15 MILES WEST OF DENVER.
THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 10 MPH.

THE THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON.  A FEW OF THE
THUNDERSTORMS MAY BECOME SEVERE WITH HAIL...STRONG GUSTY WINDS...LOCALLY
HEAVY RAIN AND DANGEROUS LIGHTNING.

PEA SIZED HAIL WAS REPORTED NEAR BOULDER...25 MILS TO THE NORTHWEST OF
DENVER AND NEAR GOLDEN 15 MILES WEST OF DENVER. ABOUT ONE HALF INCH OF
RAIN WAS INDICATED NEAR WARD...35 MILES TO THE NORTHWEST OF DENVER.

ALL PERSONS IN EASTERN COLORADO...INCLUDING THE GREATER DENVER
METROPOLITAN AREA...SHOULD MONITOR NOAA WEATHER RADIO OR OTHER
MASS MEDIA COMMUNICATIONS FOR THE LATEST WEATHER UPDATES.

BALINT...WSFO DENVER
Special weather statement, Jun 18, 5:09 PM MDT, 33 minutes before
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Special weather statement, Jun 18, 5:38 PM MDT, 4 minutes before
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</head>
<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 17, 6:24 PM MDTSevere Thunderstorm WarningBOUWashington, Yuma61 min
Jun 18, 4:11 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson59 min
Jun 18, 4:11 PM MDTSevere Thunderstorm WarningBOUBoulder59 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1987Every severe thunderstorm warning in 1987

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.