Alert archive / Wyoming / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 6, NWS Cheyenne, WY

May 18, 1987Crook County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 18, 1987, 5:45 PM MDT for Crook County, Wyoming. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: May 18, 1987, 5:45 PM MDT (23:45 UTC)
Expired: May 18, 1987, 6:45 PM MDT
In force: 60 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Crook County, WY

The radar

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

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.8 hours before the alert went out and 146 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, May 18, 3:34 PM MDT, 2 hours 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
330 PM MDT MON MAY 18 1987

SCATTERED THUNDERSTORMS CONTINUE TO DEVELOP RAPIDLY OVER THE CENTRAL
PART OF THE NEBRASKA PANHANDLE THIS MONDAY AFTERNOON. AT 320PM MDT
THE STRONGEST THUDERSTORM WAS LOCATED ABOUT 12 MILES SOUTHWEST OF
ALLIANCE NEBRASKA THAT WAS NOVING TO THE EAST AT 20 MPH.

BRIEF HEAVY RAIN...GUSTY WIND AND SMALL MAY ACCOMPANY THIS STORM OVER
NORTHERN MORRILL AND GARDEN COUNTIES OF THE NEBRASKA PANHANDLE UNTIL
5PM MDT.

SOME MARBLE SIZED HAIL WAS REPORTED NEAR ANGORA NEBRASKA...ABOUT 25
MILES EAST OF SCOTTSBLUFF...WITH THE PASSAGE OF THIS STORM.
KOSEL

Special weather statement, May 18, 4:56 PM MDT, 49 minutes before

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Special weather statement, May 18, 5:38 PM MDT, 7 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 4:30 PM MDT	Tornado Warning	CYS	Campbell, Crook	60 min
May 18, 4:50 PM MDT	Tornado Warning	CYS	Crook	55 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1987 Every 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; the sounding from the Mesonet's radiosonde archive.