Alert archive / Wyoming / Tornado Warnings in 1991
Tornado Warning 29, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 21, 1991, 5:22 PM MDT for Albany County, Wyoming. It was in force for 38 min.
The area
The counties it named.
The facts
- Issued
- Jun 21, 1991, 5:22 PM MDT (23:22 UTC)
- Expired
- Jun 21, 1991, 6:00 PM MDT
- In force
- 38 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Albany County, WY
The nearest sounding before it
Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 11.4 hours before the alert went out and 277 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
- 324 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 908 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 84 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 212325 TORCYS WYC001-220000- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 522 PM MDT FRI JUN 21 1991 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 600 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST WYOMING ...CENTRAL ALBANY COUNTY THIS INCLUDES THE TOWN OF BOSLER. AT 510 PM MDT A TORNADO WAS REPORTED BY A MOTORIST WITH A MOBILE PHONE JUST WEST OF BOSLER. THE SEVERE THUNDERSTORM WARNING FOR THE BOSLER AREA HAS BEEN UPGRADED TO A TORNADO WARNING. PEOPLE IN BOSLER SHOULD SEEK INDOOR SHELTER IMMEDIATELY. IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A BASEMENT. GET UNDER A WORKBbENCH 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. CAS
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, Jun 21, 1:02 PM MDT, 4 hours 20 minutes before
WYZ005-006-011-012-016-017-212100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 100 PM MDT FRI JUN 21 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF EASTERN WYOMING UNTIL 800 PM MDT THIS EVENING... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH... VALID UNTIL 800 PM MDT THIS EVENING...FOR MOST OF EASTERN WYOMING. THIS MEANS THAT CONDITIONS ARE FAVORABLE IN THE WATCH AREA FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS WHICH PRODUCE LARGE HAIL...DAMAGING WINDS...FREQUENT LIGHTNING...AND HEAVY RAIN. THE FOLLOWING COUNTIES IN EASTERN WYOMING ARE INCLUDED IN THE WATCH AREA...SHERIDAN...CAMPBELL...JOHNSON...CONVERSE...PLATTE...ALBANY... NIOBRARA...GOSHEN...LARAMIE...WESTERN CROOK...WESTERN WESTON...AND EASTERN NATRONA. SOME WYOMING TOWNS AND CITIES INCLUDED IN THE WATCH ARE...SHERIDAN ...LUSK...BUFFALO...LARAMIE...GILLETTE...WHEATLAND...MOORCROFT... TORRINGTON...CASPER...CHEYENNE...PINE BLUFFS...AND DOUGLAS. PEOPLE IN EASTERN WYOMING ARE URGED TO KEEP ABREAST OF THE LATEST WEATHER DEVELOPMENTS. IF THREATENING WEATHER APPROACHES...MOVE TO A SAFE SHELTER IMMEDIATELY. VIRGILLITO
Special weather statement, Jun 21, 2:04 PM MDT, 3 hours 18 minutes before
WYZ016-212104- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 204 PM MDT FRI JUN 21 1991 ...STRONG THUNDERSTORMS WERE DEVELOPING BETWEEN THE LARAMIE AND SNOWY RANGES IN SOUTHEASTERN WYOMING... AT 155 PM MDT...NATIONAL WEATHER SERVICE RADAR INDICATED STRONG THUNDERSTORMS IN EAST CENTRAL CARBON COUNTY. THE STRONGEST CELL WAS LOCATED 45 MILES NORTHWEST OF LARAMIE...WHICH IS APPROXIMATELY 10 MILES NORTH OF ARLINGTON. THE STORMS WERE MOVING NORTHWEST AT 20 MILES AN HOUR. THESE THUNDERSTORMS WILL LIKELY PRODUCE HEAVY RAIN...PEA SIZED HAIL ...FREQUENT LIGHTNING...AND STRONG WINDS. IF THIS STORM APPROACHES ...MOVE TO A SAFE SHELTER IMMEDIATELY. PEOPLE IN EASTERN WYOMKING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. VIRGILLITO
Special weather statement, Jun 21, 3:19 PM MDT, 2 hours 3 minutes before
WYZ016-212220- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 318 PM MDT FRI JUN 21 1991 ...THUNDERSTORMS CONTINUED TO DEVELOP BETWEEN THE LARAMIE AND SNOWY RANGES IN SOUTHEASTERN WYOMING... AT 310 PM MDT...THUNDERSTORMS CONTINUED TO DEVELOP IN EAST CENTRAL CARBON COUNTY AND WEST CENTRAL ALBANY COUNTY. THE STRONGEST CELL WAS LOCATED BETWEEN ARLINGTON AND ROCK RIVER...WHICH IS APPROXIMATELY 38 MILES NORTHWEST OF LARAMIE. THESE STORMS WERE SHOWING LITTLE IF ANY MOVEMENT. THESE THUNDERSTORMS WILL LIKELY PRODUCE HEAVY RAIN...PEA SIZED HAIL ...FREQUENT LIGHTNING...AND STRONG WINDS. FLOODING OF LOW LYING AREAS AND ROADS IS ALSO LIKELY DUE TO THE SLOW MOVEMENT OF THESE STORMS. IF THESE STORMS APPROACH YOU...MOVE TO A SAFE SHELTER IMMEDIATELY. < PEOPLE IN EASTERN WYOMING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. VIRGILLITO
Special weather statement, Jun 21, 3:41 PM MDT, 1 hour 41 minutes before
WYZ017-212240- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 340 PM MDT FRI JUN 21 1991 ...A STRONG THUNDERSTORM WAS MOVING INTO SOUTH CENTRAL LARAMIE COUNTY FROM COLORADO... AT 335 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM ALONG THE COLORADO/WYOMING BORDER ABOUT 10 MILES SOUTHWEST OF CHEYENNE. THIS STORM WAS MOVING NORTHEAST AT 15 MILES AN HOUR AND WILL REACH THE SOUTHERN OUTSKIRTS OF CHEYENNE BY 350 PM MDT. PEOPLE IN CHEYENNE AND THE SURROUNDING AREA CAN EXPECT HEAVY RAIN... PEA SIZED HAIL...FREQUENT LIGHTNING...AND STRONG WINDS AS THIS STORM MOVES THROUGH THE CITY. BE PREPARED TO MOVE TO A SAFE SHELTER AS THIS STORM MAY INTENSIFY. VIRGILLITO
Special weather statement, Jun 21, 3:45 PM MDT, 1 hour 37 minutes before
WYZ017-212240- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 345 PM MDT FRI JUN 21 1991 ...A STRONG THUNDERSTORM WAS MOVING INTO SOUTH CENTRAL LARAMIE COUNTY FROM COLORADO... AT 335 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM ALONG THE COLORADO/WYOMING BORDER ABOUT 10 MILES SOUTHWEST OF CHEYENNE. THIS STORM WAS MOVING NORTHEAST AT 15 MILES AN HOUR AND WILL REACH THE SOUTHERN OUTSKIRTS OF CHEYENNE BY 350 PM MDT. PEOPLE IN CHEYENNE AND THE SURROUNDING AREA CAN EXPECT HEAVY RAIN... PEA SIZED HAIL...FREQUENT LIGHTNING...AND STRONG WINDS AS THIS STORM MOVES THROUGH THE CITY. BE PREPARED TO MOVE TO A SAFE SHELTER AS THIS STORM MAY INTENSIFY. PEOPLE IN EASTERN WYOMING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. CORRECTED TO INCLUDE SEVERE THUNDERSTORM WATCH VIRGILLITO
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 6:15 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 30 min |
| Jun 21, 5:16 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 29 min |
| Jun 21, 5:17 PM MDT | Severe Thunderstorm Warning | CYS | Washakie | 43 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.