Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 37, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 9, 1990, 5:56 PM MDT for Laramie County, Wyoming. It was in force for 64 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 9, 1990, 5:56 PM MDT (23:56 UTC)
- Expired
- Jun 9, 1990, 7:00 PM MDT
- In force
- 64 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 9, 6:12 PM MDT | Hail 1.75 | Laramie, WY | |
| Jun 9, 6:40 PM MDT | Hail 1.25 | Laramie, WY |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 11.9 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
- 31 J/kg
- Mixed-layer CIN
- -456 J/kg
- Mixed-layer LCL
- 2000 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 25 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 092356
SVRCYS
WYC021-100100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
556 PM MDT SAT JUN 9 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE SOUTHEAST PART OF WYOMING
SOUTHERN LARAMIE COUNTY
THIS INCLUDES THE CITY OF CHEYENNE PLUS THE TOWNS OF CARPENTER AND
BURNS.
AT 550 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 15 MILES
SOUTH OF CHEYENNE. THE STORM WAS MOVING NORTH AT 10 MILES AN
HOUR.
LARGE HAIL HAS ALREADY BEEN REPORTED WITH THIS STORM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 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 DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.
A TORNADO WIATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.
MENTZERWhat 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, Jun 9, 2:10 PM MDT, 3 hours 46 minutes before
WYZ015>017-092130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 210 PM MDT SAT JUN 9 1990 ...THE THREAT OF SEVERE WEATHER WILL INCREASE THIS AFTERNOON AND EVENING... A TORNADO WATCH HAS BEEN ISSUED FOR NORTHEAST COLORADO BUT DOES NOT ...AT THIS TIME...INCLUDE ANY AREA OF WYOMING. HOWEVER...SEVERE THUNDERSTORMS ARE POSSIBLE IN THE SOUTHEAST CORNER OF WYOMING LATE THIS AFTERNOON AND EVENING. THUNDERSTORMS ARE DEVLOPING ALONG THE LARAMIE RANGE ABOUT 20 MILES WEST OF CHEYENNE THIS AFTERNOON AND WILL MOVE SLOWLY EAST. AROUND 5PM TO 6PM THUNDERSTORMS HAIL AND GUSTY WINDS WILL BE POSSIBLE ALONG I-25 BETWEEN CHEYENNE AND CHUGWATER. CHUGWATER IS ABOUT 22 MILES SOUTH O-F WHEATLAND. THUNDERSTORMS...SOME POSSIBLY SEVERE...WILL CONTINUE TIL AROUND SUNSET. PEOPLE IN SOUTHEAST WYOMING ARE URGED TO KEEP AN EYE ON THE SKY AND KEEP UP TO DATE BY LISTENING TO THIS STATION FOR WEATHER DETAILS. SANDERS
Special weather statement, Jun 9, 4:40 PM MDT, 1 hour 16 minutes before
WYZ013-014-092330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 440 PM MDT SAT JUN 9 1990 ...THUNDERSTORMS MOVE OVER SOUTHWEST WYOMING... WIDELY SCATTERED THUNDERSTORMS MOVED OVER SOUTHWEST WYOMING THIS AFTERNOON. AT 430 PM MDT RADAR INDICATED THUNDERSTORMS EXTENDING FROM BIG PINEY TO ROCK SPRINGS. THE STRONGEST CELL WAS NEAR THE TOWN OF LYMAN...ABOUT 35 MILES EAST OF EVANSTON. STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT OVER WESTERN WYOMING. SOME STORMS MAY PRODUCE GUSTY WINDS...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING. STAY INDOORS IF A THUNDERSTORM APPROACHES YOUR AREA. MENTZER
Special weather statement, Jun 9, 5:32 PM MDT, 24 minutes before
WYZ017-100030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 535 PM MDT SAT JUN 9 1990 ...THUNDERSTORMS WERE BUILDING IN SOUTHEAST WYOMING... WEATHER RADAR SHOWED THAT THUNDERSTORMS WERE CONTINUING TO BUILD IN LARAMIE COUNTY OF FAR SOUTHEAST WYOMING AT 530 PM. NONE OF THE STORMS AT THIS TIME WERE VERY STRONG. HOWEVER...CONDITIONS ARE RIPE FOR THESE STORMS TO CONTINUE GETTING STRONGER IN SOUTHEAST WYOMING THIS EVENING. JUST ACROSS THE BORDER IN NORTHEAST COLORADO...SOME STORMS WERE QUITE STRONG. A TORNADO WAS SPOTTED BY THE PUBLIC AT 515 PM 5 MILES WEST OF THE TOWN OF NUNN COLORADO...WHICH IS ABOUT 30 MILES SOUTH OF THE CITY OF CHEYENNE. RESIDENTS OF SOUTHEAST WYOM9ING SHOULD KEEP AN EYE TO THE SKY THIS EVENING AS THESE STORMS CONTINUE TO DEVELOP. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE. DASELER
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.