Alert archive / Wyoming / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 75, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 30, 1991, 4:58 PM MDT for Laramie County, Wyoming. It was in force for 47 min.
The area
The counties it named.
The facts
- Issued
- May 30, 1991, 4:58 PM MDT (22:58 UTC)
- Expired
- May 30, 1991, 5:45 PM MDT
- In force
- 47 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 11.0 hours before the alert went out and 202 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
- NaN m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 30, 3:01 PM MDT, 1 hour 57 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, 1 hour 32 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
Special weather statement, May 30, 4:37 PM MDT, 21 minutes before
WYZ006-012-017-310000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 435 PM MDT THU MAY 30 1991 ...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EXTREME EASTERN WYOMING TIL 900 PM... A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EXTREME SOUTHEAST WYOMING TIL 900 PM THIS EVENING. THIS IS IN ADDITION TO THE PREVIOUSLY ISSUED SEVERE THUNDERSTORM WATCH FOR EXTREME NORTHEAST WYOMING. SOME CITIES THAT ARE NOW WITHIN WITHER SEVERE THUNDERSTORM WATCHES ARE... PINE BLUFFS...WHEATLAND...TORRINGTON...GILLETTE...SUNDANCE... NEWCASTLE...DOUGLAS AND LUSK. A SEVERE THUNDERSTORM WATCH MEANS THAT SEVERE THUNDERSTORMS ARE POSSIBLE IN THAT AREA. ALREADY THIS AFTERNOON...SEVERAL TORNADOES HAVE BEEN SPOTTED IN EAST CENTRAL WYOMING ALONG WITH LARGE HAIL. AT 430 PM...THUNDERSTORMS CONTINUED TO DEVELOP OVER THE EAST PART OF WYOMING...WITH THE MOST INTENSE STORMS STILL IN EAST CENTRAL WYOMING. ALL OF THE STORMS WERE MOVING NOeRTHEAST AT 30 MILES AN HOUR. PEOPLE IN EXTREME EASTERN WYOMING SHOULD BE ALERT TO THE POSSBILITY OF SEVERE THUNDERSTORMS DURING THE EVENING HOURS. IF A STORM APPROACHES...MOVE TO A SAFE SHELTER RIGHT AWAY. WEILAND
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 7:12 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 48 min |
| May 29, 9:09 PM MDT | Flash Flood Warning | CYS | Dawes, Sioux | 3 hr |
| 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, 4:17 PM MDT | Tornado Warning | CYS | Goshen, Platte | 43 min |
| May 30, 5:40 PM MDT | Tornado Warning | CYS | Laramie | 50 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1991Every severe thunderstorm warning 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.