Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 68, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 4, 1990, 5:34 PM MDT for Laramie County, Wyoming. It was in force for 56 min.
The area
The counties it named.
The facts
- Issued
- Jul 4, 1990, 5:34 PM MDT (23:34 UTC)
- Expired
- Jul 4, 1990, 6:30 PM MDT
- In force
- 56 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie 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
Denver, CO (KDEN), launched 12:00Z, 11.6 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
- 3 J/kg
- Mixed-layer CIN
- -167 J/kg
- Mixed-layer LCL
- 1212 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 85 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 042335
SVRCYS
WYC021-050030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
534 PM MDT WED JUL 4 1990
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHEAST WYOMING
...EASTERN LARAMIE
AT 535 PM MDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM
25 MILES NORTHEAST OF CHEYENNE TO JUST SOUTHEAST OF CITY OF CHEYENNE.
MOVEMENT OF THE LINE WAS EAST AT 20 MILES AN HOUR. THESE STORMS HAVE
HAD A HISTORY OF PRODUCING VERY HEAVY RAIN IN A SHORT PERIOD OF
TIME. THIS WARNING DOES NOT INCLUDE THE CITY OF CHEYENNE.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
EKBWhat 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, Jul 4, 3:46 PM MDT, 1 hour 48 minutes before
WYZ012-016-017-042245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 345 PM MDT WED JUL 4 1990 ...THUNDERSTORMS WERE INTENSIFYING OVER SOUTHEAST WYOMING... AT 330 PM MDT THUNDERSTORMS WERE INTENSIFYING OVER THE SOUTHEAST QUARTER OF WYOMING. THE STRONGER STORMS WERE 25 TO 30 MILES WEST OF CHEYENNE. ALSO...OTHER THUNDERSTORMS WERE OVER THE SOUTHEAST...ALL MOVING TO THE EAST AT 25 MILES AN HOUR. AT 325 PM MDT MARBLE SIZED DIAMETER HAIL WAS REPORTED NEAR CRYSTAL RESERVOIR...ABOUT 30 MILES WEST OF CHEYENNE. IN ADDITION...AT 340 PM MDT CURT GOWDY STATE PARK...25 MILES WEST OF CHEYENNE...RECEIVED ONE QUARTER INCH DIAMETER HAIL AS WELL AS AN INCH OF RAIN IN FIFTEEN MINUTES. AS THE STORMS MOVE EAST THROUGH THE EVENING...HAIL...VERY HEAVY RAIN... GUSTY WINDS AND DANGEROUS LIGHTNING WILL OCCUR. THE STORMS WILL CONTINUE TO BECOME STRONGER AS THEY MOVE EAST...AWAY FROM THE LARAMIE RANGE. PEOPLE OUTDOORS IN SOUTHEASbT WYOMING THROUGH THE EVENING SHOULD BE PREPARED TO APPROPRIATE SHELTER WHEN A STORM APPROACHES. WEILAND
Special weather statement, Jul 4, 4:16 PM MDT, 1 hour 18 minutes before
NEZ001-005-011-042330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 415 PM MDT WED JUL 4 1990 ...THUNDERSTORMS ENTERING THE WESTERN NEBRASKA PANHANDLE... AT 415 PM MDT...THUNDERSTORMS WERE ENTERING THE WESTERN NEBRASKA PANHANDLE FROM EASTERN WYOMING. THE STORMS EXTENDED FROM 15 MILES SOUTHWEST OF HARRISON NEBRASKA...OR 55 MILES WEST OF CHADRON IN THE NORTHERN NEBRASKA PANHANDLE TO 25 MILES SOUTHWEST OF SCOTTSBLUFF NEBRASKA IN THE CENTRAL PANHANDLE. THE STRONGEST STORM WAS 20 MILES WEST OF SCOTTSBLUFF AND ALL OF THE STORMS WERE MOVING TO THE EAST AT 15 MILES AN HOUR. BRIEF HEAVY RAIN...STRONG WIND AND SMALL HAIL IS POSSIBLE WITH THESE STORMS AS THEY MOVE INTO EAST ACROSS SIOUX...SCOTTSBLUFF AND BANNER COUNTIES OF THE NEBRASKA PANHANDLE UNTIL 530 PM MDT. KIRK
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 4:35 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 60 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.