Alert archive / Wyoming / Tornado Warnings in 1987

Tornado Warning 1, NWS Cheyenne, WY

May 18, 1987Campbell County, Crook County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 18, 1987, 4:30 PM MDT for Campbell County, Crook County, Wyoming. It was in force for 60 min. 2 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
May 18, 1987, 4:30 PM MDT (22:30 UTC)
Expired
May 18, 1987, 5:30 PM MDT
In force
60 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

Counties Campbell County, WY, Crook County, WY

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
May 18, 5:05 PM MDTHail 0.75Crook, WY
May 18, 5:30 PM MDTTornado F0Campbell, WY

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

Rapid City, SD (KRAP), launched 12:00Z, 10.5 hours before the alert went out and 178 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, Rapid City, SD at 12:00Z on 1987-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 1987-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
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

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSHR 182226
TORSHR
WYC005-182220-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHERIDAN WY
430 PM MDT MON MAY 18 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE
UNTIL 530 PM FOR PEOPLE IN THE FOLLOWING COUNTY...       

IN NORTHEAST WYOMING
          ...EASTERN CAMPBELL...SOUTHERN CROOK

A TORNADO WAS SIGHTED NEAR WYODAK WY...7 MI EAST OF GILLETTE WYOMING
AT 415 PM MOVING EAST.  NO DAMAGE HAS BEEN REP*ORTED...BUT PEOPLE IN
EASTERN CAMPBELL COUNTY AND SOUTHERN CROOK COUNTY IN NORTHEAST WYOMIN
SHOULD BE PREPARED TO TAKE COVER IF A TORNADO APPROACHES.
$$   
DEH

What forecasters said that day

The local office's own words before this tornado 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, 56 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

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 4:50 PM MDTTornado WarningCYSCrook55 min
May 18, 5:45 PM MDTSevere Thunderstorm WarningCYSCrook60 min

Nearby

Tornado Warnings in Wyoming, 1987Every tornado warning in 1987Tornadoes 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.