Alert archive / Wyoming / Tornado Warnings in 1987
Tornado Warning 1, NWS Cheyenne, WY
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
| Time | Report | Where | Remark |
|---|---|---|---|
| May 18, 5:05 PM MDT | Hail 0.75 | Crook, WY | |
| May 18, 5:30 PM MDT | Tornado F0 | Campbell, 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.
- 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
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.
$$
DEHWhat 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 4:50 PM MDT | Tornado Warning | CYS | Crook | 55 min |
| May 18, 5:45 PM MDT | Severe Thunderstorm Warning | CYS | Crook | 60 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.