Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 79, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 23, 1990, 3:33 PM MDT for Lincoln County, Wyoming. It was in force for 57 min. 1 report 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
- Jul 23, 1990, 3:33 PM MDT (21:33 UTC)
- Expired
- Jul 23, 1990, 4:30 PM MDT
- In force
- 57 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Lincoln 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 |
|---|---|---|---|
| Jul 23, 3:50 PM MDT | Thunderstorm Wind 50 | Lincoln, 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
Lander/Hunt Fiel, WY (KLND), launched 12:00Z, 9.6 hours before the alert went out and 172 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
- 1832 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 21 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 232133
SVRCYS
WYC023-232230-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
333 PM MDT MON JUL 23 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 430 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE SOUTHWEST PART OF WYOMING
LINCOLN COUNTY
AT 328 PM MDT A SEVERE THUNDERSTORM WAS REPORTED NEAR THE
WYOMING-IDAHO BORDER NEAR THE TOWN OF MONTPELIER IDAHO...OR ABOUT
30 MILES SOUTHWEST OF AFTON WYOMING. THE STORM WAS MOVING EAST AT
20 MILES AN HOUR...AND WILL BE IN LINCOLN COUNTY BY 345 PM MDT.
THIS STORM HAS ALREADY PRODUCED WIND GUSTS OF 75 MILES AN HOUR
IN EXTREME EASTERN IDAHO.
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.
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, Jul 23, 3:25 PM MDT, 8 minutes before
WYZ013-232330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 325 PM MDT MON JUL 23 1990 ...WIND GUSTS TO 50 MPH REPORTED WEST OF THE WYOMING BORDER NEAR COKEVILLE IN THE SOUTHWEST CORNER OF WYOMING... AT 315 PM MDT OBSERVERS NEAR SODA SPRINGS IDAHO REPORTED WIND GUSTS NEAR 50 MILES AN HOUR IN A THUNDERSTORM. SODA SPRINGS IS ABOUT 30 MILES WEST OF COKEVILLE. THE THUNDERSTORM PRODUCING THESE WINDS IS MOVING EAST AT 15 MILES AN HOUR AND WILL REACH THE COKEVILLE AREA AROUND 345 PM MDT. EVEN STRONGER WINDS ARE VERY POSSIBLE WITH THIS STORM ALONG HAIL... HEAVY RAIN AND DANGEROUS LIGHTNING. PEOPLE SHOULD KEEP AN EYE ON THE SKY AND BE READY TO QUICKLY SEEK SHELTER AS THE STORM APPROACHES. MOVE TO INTERIOR ROOMS IN THE EVENT THAT THE WINDOWS ARE DAMAGED BY A WIND-DRIVEN OBJECT. CAS
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 6:15 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jul 23, 5:01 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 49 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.