Alert archive / Wyoming / Tornado Warnings in 1991
Tornado Warning 9, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at May 30, 1991, 4:17 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 43 min.
The area
The counties it named.
The facts
- Issued
- May 30, 1991, 4:17 PM MDT (22:17 UTC)
- Expired
- May 30, 1991, 5:00 PM MDT
- In force
- 43 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
Counties Goshen County, WY, Platte County, WY
The nearest sounding before it
Rapid City, SD (KRAP), launched 12:00Z, 10.3 hours before the alert went out and 261 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1552 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 134 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 KCYS 302218 TORCYS WYC015-031-302300- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 417 PM MDT THU MAY 30 1991 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 500 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST WYOMING ...NORTHERN GOSHEN COUNTY...NORTHEASTERN PLATTE COUNTY THIS WARNING INCLUDES THE TOWNS OF HARTVILLE AND SUNRISE. AT 415 PM...A TORNADO WAS REPORTED ON THE GROUND IN THE VICINITY OF HARTVILLE...WHICH IS 22 MILES NORTHEAST OF WHEATLAND. THE PARENT THUNDERSTORM WAS MOVING NORTHEAST AT 25 MILES AN HOUR...AND WILL MOVE INTO NORTHERN GOSHEN COUNTY. IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR. USE BLANKETS...PILLOWS... OR CUSHIONS TO COVER YOUR BODY. < AVOID WINDOWS. JAD
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 30, 3:01 PM MDT, 1 hour 16 minutes before
WYZ006-012-310000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 300 PM MDT THU MAY 30 1991 ...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR NORTHEAST WYOMING FOR THIS AFTERNOON AND EVENING... THUNDERSTORMS HAVE BEGUN TO DEVELOP IN EASTERN WYOMING AGAIN. THE STRONGEST STORMS ARE EXPECTED TO FORM OVER NORTHEAST SECTIONS OF THE STATE. AS A RESULT...THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH VALID FROM 330 PM THIS AFTERNOON UNTIL 900 PM THIS EVENING. THE WATCH AREA INCLUDES CROOK...WESTON...NIOBRARA...EASTERN CAMPBELL ...AND EASTERN CONVERSE COUNTIES. PERSONS IN THOSE COUNTIES ARE ADVISED TO KEEP ABREAST OF THE LATEST WEATHER DEVELOPMENTS. < CGB
Special weather statement, May 30, 3:26 PM MDT, 51 minutes before
WYZ012-302200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 325 PM MDT THU MAY 30 1991 ...A STRONG THUNDERSTORM HAS DEVELOPED IN FAR WESTERN GOSHEN COUNTY IN SOUTHEAST WYOMING AT 320 PM... THE STORM WAS LOCATED ABOUT 18 MILES SOUTHEAST OF WHEATLAND...AND MOVING NORTH NORTHEAST AT ABOUT 25 MILES AN HOUR INTO FAR WESTERN GOSHEN COUNTY. PEOPLE IN WESTERN GOSHEN COUNTY SHOULD REMAIN ALERT TO THIS STORM... AS IT LIKELY IS PRODUCING SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS. GO TO SAFE PLACE SUCH AS YOUR BASEMENT AND WAIT FOR THE STORM TO PASS. JAD
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 3:59 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 61 min |
| May 30, 4:00 PM MDT | Tornado Warning | CYS | Goshen | 30 min |
| May 30, 4:58 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 47 min |
| May 30, 5:40 PM MDT | Tornado Warning | CYS | Laramie | 50 min |
Nearby
Tornado Warnings in Wyoming, 1991Every tornado warning in 1991Tornadoes in 1991
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.