Alert archive / Wyoming / Tornado Warnings in 1991
Tornado Warning 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at May 2, 1991, 4:52 PM MDT for Sweetwater County, Wyoming. It was in force for 23 min.
The area
The counties it named.
The facts
- Issued
- May 2, 1991, 4:52 PM MDT (22:52 UTC)
- Expired
- May 2, 1991, 5:15 PM MDT
- In force
- 23 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Sweetwater County, WY
The nearest sounding before it
Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 10.9 hours before the alert went out and 130 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
- 949 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- -93 m²/s²
- 0-3 km storm-relative helicity
- 142 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 022253 TORCYS WYC037-022315- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 452 PM MDT THU MAY 2 1991 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 515 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST WYOMING ...NORTHWESTERN SWEETWATER COUNTY AT 436PM THIS AFTERNOON SEARCH AND RESCUE PERSONNEL REPORTED A TORNADO NEAR FONTENELLE IN NORTHEAST LINCOLN COUNTY...OR ABOUT 40 MILES WEST OF FARSON WHICH IS IN NORTHWEST SWEETWATER COUNTY. THE TORNADO WAS MOVING EAST. DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATHe OF A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT. CGB
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 2, 12:49 PM MDT, 4 hours 3 minutes before
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
Special weather statement, May 2, 3:50 PM MDT, 1 hour 2 minutes before
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
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.