Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 29, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 6, 1990, 4:49 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 41 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
- Jun 6, 1990, 4:49 PM MDT (22:49 UTC)
- Expired
- Jun 6, 1990, 5:30 PM MDT
- In force
- 41 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
Counties Goshen County, WY, Platte 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 6, 5:10 PM MDT | Hail 0.75 | Goshen, 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
Rapid City, SD (KRAP), launched 12:00Z, 10.8 hours before the alert went out and 261 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
- 1041 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 788 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 062249
SVRCYS
WYC015-031-062330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
449 PM MDT WED JUN 6 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 530 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE SOUTHEAST PART OF WYOMING
NORTHERN GOSHEN COUNTY...NORTHEAST PLATTE COUNTY
THIS WARNING INCLUDES THE TOWNS OF GUERNSEY...FORT LARAMIE...AND
HARTVILLE.
AT 445 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES
SOUTHWEST OF GUERNSEY...OR ABOUT 15 MILES NORTHEAST OF WHEATLAND.
THE STORM WAS MOVING NORTHEAST AT 30 MILES AN HOUR.
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 WATCH 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 6, 1:26 PM MDT, 3 hours 23 minutes before
WYZ012-017-062130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 125 PM MDT TUE JUN 5 1990 THUNDERSTORMS HAVE BEGUN TO FORM EARLY THIS AFTERNOON OVER THE LARAMIE MOUNTAINS OF SOUTHEAST WYOMING. CONDITIONS WILL BE RIPE FOR STRONG THUNDERSTORMS THIS AFTERNOON AND EVENING OVER SOUTHEAST WYOMING EAST OF THE LARAMIE MOUNTAINS INCLUDING LARAMIE...PLATTE AND GOSHEN COUNTIES. THE STORMS WILL HAVE THE POTENTIAL FOR HAIL...STRONG GUSTY WINDS...HEAVY RAIN AND DANGEROUS LIGHTNING. PEOPLE IN SOUTHEAST WYOMING SHOULD WATCH THE SKY AND MONITOR LOCAL BROADCASTS FOR NEW DEVELOPMENTS. SCOTT
Special weather statement, Jun 6, 2:19 PM MDT, 2 hours 30 minutes before
WYZ012-017-062230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 215 PM MDT WED JUN 6 1990 ...TORNADO WATCH FOR SOUTHEAST WYOMING... STRONG THUNDERSTORMS HAVE DEVELOPED IN NORTHERN LARAMIE COUNTY ABOUT 20 MILES NORTH OF CHEYENNE. THESE STORMS MOST LIKELY CONTAIN HAIL AND STRONG GUSTY WINDS. THE STORMS HAVE BEEN MOVING EAST AT ABOUT 30 MILES AN HOUR. THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER SOUTHEAST WYOMING THIS AFTERNOON. SOME STORMS MAY BE SEVERE WITH LARGE HAIL...STRONG WINDS AND POSSIBLY TORNADOES. PEOPLE IN SOUTHEAST WYOMING SHOULD WATCH THE SKY AND STAY TUNED TO LOCAL BROADCASTS FOR NEW DEVELOPMENTS. SCOTT
Special weather statement, Jun 6, 4:28 PM MDT, 21 minutes before
WYZ012-017-062330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 326 PM MDT WED JUN 6 1990 ...A TORNADO WATCH CONTINUES FOR SOUTHEAST WYOMING UNTIL 9 PM... AT 320 PM MDT SHOWERS AND THUNDERSTORMS CONTINUED ACROSS SOUTHEAST WYOMING. THE STRONGEST STORM WAS LOCATED JUST WEST OF WHEATLAND. ALL STORMS WERE MOVING EAST AT 35 MILES AN HOUR. THUNDERSTORMS WILL CONTINUE ACROSS SOUTHEAST WYOMING THE REST OF THIS EVENING. THESE STORMS WILL PRODUCE FREQUENT LIGHTNING...STRONG WINDS...AND HAIL. SOME STORMS MAY PRODUCE TORNADOS. IF YOU DO OBSERVE A TORNADO...TAKE SHELTER IMMEDIATELY. MENTZER
Special weather statement, Jun 6, 4:30 PM MDT, 19 minutes before
WYZ012-017-062330- SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE CHEYENNE WY 426 PM MDT WED JUN 6 1990 ...A TORNADO WATCH CONTINUES FOR SOUTHEAST WYOMING UNTIL 9 PM... AT 420 PM MDT SHOWERS AND THUNDERSTORMS CONTINUED ACROSS SOUTHEAST WYOMING. THE STRONGEST STORM WAS LOCATED JUST WEST OF WHEATLAND. ALL STORMS WERE MOVING EAST AT 35 MILES AN HOUR. THUNDERSTORMS WILL CONTINUE ACROSS SOUTHEAST WYOMING THE REST OF THIS EVENING. THESE STORMS WILL PRODUCE FREQUENT LIGHTNING...STRONG WINDS...AND HAIL. SOME STORMS MAY PRODUCE TORNADOS. IF YOU DO OBSERVE A TORNADO...TAKE SHELTER IMMEDIATELY. MENTZER
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 3:03 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 42 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.