Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 87, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 1, 1990, 5:35 PM MDT for Carbon County, Wyoming. It was in force for 40 min.
The area
The counties it named.
The facts
- Issued
- Aug 1, 1990, 5:35 PM MDT (23:35 UTC)
- Expired
- Aug 1, 1990, 6:15 PM MDT
- In force
- 40 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Carbon County, WY
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 11.6 hours before the alert went out and 192 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
- 2232 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 45 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 012336
SVRCYS
WYC007-020015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
535 PM MDT WED AUG 1 1990
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 615 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH CENTRAL WYOMING
...WESTERN CARBON
AT 520 PM MDT A THUNDERSTORM WEST OF RAWLINS PRODUCED A WIND GUST TO
58 MILES AN HOUR. THE STORMS HAVE BEEN MOVING EAST AT 25 MILES AN
HOUR.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.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, Aug 1, 4:06 PM MDT, 1 hour 29 minutes before
WYZ012-017-012300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 405 PM MDT WED AUG 1 1990 ...INTENSE THUNDERSTORMS DEVELOPING OVER SOUTHEAST WYOMING... STRONG THUNDERSTORMS WERE DEVELOPING OVER SOUTHEAST WYOMING THIS AFTERNOON. THE MOST INTENSE STORM WAS LOCATED JUST EAST OF CHUGWATER WYOMING OR ABOUT 40 NORTH OF CHEYENNE. THE STORM WAS MOVING TO THE NORTHEAST AT 20 MPH. OTHER STORMS WERE DEVELOPING IN LARAMIE COUNTY ABOUT 20 MILES EAST AND WEST OF THE CITY OF CHEYENNE. EARLIER TODAY PEA-SIZE HAIL AND BRIEF HEAVY RAINS WERE OBSERVED WITH THESE STORMS. PEOPLE IN SOUTHEAST WYOMING SHOULD BE ON THE LOOKOUT FOR POTENTIALLY THREATENING WEATHER. HAIL...DEADLY LIGHTNING] AND HEAVY RAINS ARE POSSIBLE THIS AFTERNOON AND EARLY THIS EVENING IN AND AROUND THESE STORMS. PARKER
Special weather statement, Aug 1, 5:29 PM MDT, 6 minutes before
WYZ017-020000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 530 PM MDT WED AUG 1 1990 ...STRONG THUNDERSTORMS IN EASTERN LARAMIE COUNTY... RADAR INDICATED A VERY STRONG THUNDERSTORM JUST WEST OF PINE BLUFFS WYOMING OR ABOUT 35 MILES EAST OF CHEYENNE. THE STORM WILL MOVE INTO THE PINE BLUFFS AREA BETWEEN 530 AND 6 PM. VERY HEAVY RAIN... HAIL...GUSTY WINDS AND FREQUENT LIGHTNING WILL BE WITH THE STORM. PEOPLE IN SOUTHEAST WYOMING SHOULD BE ON THE LOOKOUT FOR POTENTIALLY THREATENING WEATHER. HAIL...DEADLY LIGHTNING AND HEAVY RAINS ARE POSSIBLE THIS AFTERNOON AND EARLY THIS EVENING IN AND AROUND THESE STORMS. SCOTT
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 3:25 PM MDT | Severe Thunderstorm Warning | CYS | Sweetwater | 65 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1990Every severe thunderstorm warning in 1990
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.