Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 15, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 7, 1998, 11:47 AM MDT for Laramie County, Wyoming. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 7, 1998, 11:47 AM MDT (17:47 UTC)
- Expired
- May 7, 1998, 12:05 PM MDT
- In force
- 18 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 17:44 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 5.8 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
- 23 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 1042 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
244 WUUS1 KCYS 071748 RRA SVRCYS WYC021-071810- BULLETIN - IMMEDIATE BROADCAST REQUESTED...CORRECTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1147 AM MDT THU MAY 7 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN AND EASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 1205 PM MDT * AT 1131 AM MDT...CONSIDERABLE SMALL HAIL AND SOME DIME SIZED HAIL WAS REPORTED BY MILITARY PERSONNEL NEAR HORSE CREEK. ANOTHER SEVERE STORM WAS 20 MILES NORTHEAST OF CHEYENNE. THE SEVERE STORMS WERE MOVING SOUTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORMS WILL REMAIN OVER RURAL AREAS. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS & CORRECTED TO TAKE OUT THE MENTION OF THE TORNADO WATCH. WCJIN-WYSE WEILAND
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, May 7, 10:01 AM MDT, 1 hour 46 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-080000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1001 AM MDT THU MAY 7 1998 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS LOW TODAY. SPOTTER ACTIVATION WILL NOT BE REQUIRED. DISCUSSION...SHOWERS AND THUNDERSTORMS WILL AGAIN BE FAIRLY WIDESPREAD OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON. THIS WILL ESPECIALLY BE THE CASE IN THE SOUTHERN NEBRASKA PANHANDLE AND FROM GOSHEN AND PLATTE COUNTIES SOUTH AND WESTWARD. THE ATMOSPHERE WILL BE MOIST AND FAIRLY UNSTABLE...BUT THE COOL TEMPERATURES AT THE SURFACE WILL LIMIT STORM INTENSITY. AS WAS THE CASE ON WEDNESDAY...SOME OF THE STORMS WILL PRODUCE HEAVY RAIN AND SMALL HAIL AS THEY MOVE TO THE SOUTHEAST AT 20 MPH. THE CURRENT SHOWERS IN THE WESTERN NEBRASKA PANHANDLE WILL SLOWLY INTENSIFY IN THE SOUTHERN PANHANDLE DURING THE AFTERNOON. WCJIN-WYSE-WYNE WEILAND
Special weather statement, May 7, 10:01 AM MDT, 1 hour 46 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-080000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1001 AM MDT THU MAY 7 1998 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS LOW TODAY. SPOTTER ACTIVATION WILL NOT BE REQUIRED. DISCUSSION...SHOWERS AND THUNDERSTORMS WILL AGAIN BE FAIRLY WIDESPREAD OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON. THIS WILL ESPECIALLY BE THE CASE IN THE SOUTHERN NEBRASKA PANHANDLE AND FROM GOSHEN AND PLATTE COUNTIES SOUTH AND WESTWARD. THE ATMOSPHERE WILL BE MOIST AND FAIRLY UNSTABLE...BUT THE COOL TEMPERATURES AT THE SURFACE WILL LIMIT STORM INTENSITY. AS WAS THE CASE ON WEDNESDAY...SOME OF THE STORMS WILL PRODUCE HEAVY RAIN AND SMALL HAIL AS THEY MOVE TO THE SOUTHEAST AT 20 MPH. THE CURRENT SHOWERS IN THE WESTERN NEBRASKA PANHANDLE WILL SLOWLY INTENSIFY IN THE SOUTHERN PANHANDLE DURING THE AFTERNOON. WCJIN-WYSE-WYNE WEILAND
Special weather statement, May 7, 10:07 AM MDT, 1 hour 40 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-090000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1007 AM MDT THU MAY 7 1998 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS LOW TODAY. SPOTTER ACTIVATION WILL NOT BE REQUIRED. DISCUSSION...SHOWERS AND THUNDERSTORMS WILL AGAIN BE FAIRLY WIDESPREAD OVER SOUTHEAST WYOMING AND THE SOUTHERN NEBRASKA PANHANDLE THIS AFTERNOON. THE AIRMASS REMAINS FAIRLY MOIST AND UNSTABLE AND SO SMALL HAIL AND BRIEF HEAVY RAIN WILL ACCOMPANY MANY OF THE STORMS. THE HAIL SIZE WILL BE LIMITED BY THE FAIRLY COOL TEMPERATURES. HOWEVER...WITH BETTER WIND SHEAR IN THE ATMOSPHERE THERE IS A BIT GREATER POSSIBILITY DURING THE AFTERNOON OF LARGER HAIL THAN IN RECENT DAYS. WCJIN-WYSE-WYNE WEILAND
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 11:40 AM MDT | Severe Thunderstorm Warning | CYS | Laramie | 25 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1998Every severe thunderstorm warning in 1998
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; radar from the NEXRAD Level II archive.