Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 112, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 11, 1998, 2:49 PM MDT for Laramie County, Wyoming. It was in force for 46 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
- Jul 11, 1998, 2:49 PM MDT (20:49 UTC)
- Expired
- Jul 11, 1998, 3:35 PM MDT
- In force
- 46 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 20:53 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, 8.8 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1936 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 61 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 112048 RRA SVRCYS WYC021-112135- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 249 PM MDT SAT JUL 11 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 335 PM MDT * AT 245 PM MDT ...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES EAST OF CHEYENNE...OR 5 MILES NORTH OF BURNS... MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL REMAIN IN OPEN COUNTRY DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! LRE
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, Jul 11, 10:15 AM MDT, 4 hours 34 minutes before
WYZ061>070-NEZ001>003-019>021-054-055-120000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1015 AM MDT SAT JUL 11 1998 THE SEVERE WEATHER POTENTIAL IN SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE IS LOW TODAY. SPOTTER ACTIVATION MAY BE REQUIRED IN THE NEBRASKA PANHANDLE. DISCUSSION...THE ATMOSPHERE OVER SOUTHEAST WYOMING WILL DRY OUT SOME THIS AFTERNOON WITH BETTER LOW LEVEL MOISTURE PERSISTING OVER THE NEBRASKA PANHANDLE AS A TROUGH OF LOW PRESSURE DEVELOPS OVER THE HIGH PLAINS EAST OF THE FRONT RANGE TODAY. DAY TIME HEATING WILL CAUSE MODERATE INSTABILITY OVER EXTREME SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE THIS AFTERNOON. DIRECTIONAL WIND SHEAR WILL BE BETTER THAN YESTERDAY AND MAY CAUSE ISOLATED SUPER CELL THUNDERSTORMS LATER IN THE DAY...ESPECIALLY OVER THE NEBRASKA PANHANDLE. A 10 TO 20 PERCENT COVERAGE OF AFTERNOON THUNDERSTORMS IS EXPECTED OVER THE AREA. WCJIN-WYSE-WYNE PAL
Special weather statement, Jul 11, 10:15 AM MDT, 4 hours 34 minutes before
WYZ061>070-NEZ001>003-019>021-054-055-120000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1015 AM MDT SAT JUL 11 1998 THE SEVERE WEATHER POTENTIAL IN SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE IS LOW TODAY. SPOTTER ACTIVATION MAY BE REQUIRED IN THE NEBRASKA PANHANDLE. DISCUSSION...THE ATMOSPHERE OVER SOUTHEAST WYOMING WILL DRY OUT SOME THIS AFTERNOON WITH BETTER LOW LEVEL MOISTURE PERSISTING OVER THE NEBRASKA PANHANDLE AS A TROUGH OF LOW PRESSURE DEVELOPS OVER THE HIGH PLAINS EAST OF THE FRONT RANGE TODAY. DAY TIME HEATING WILL CAUSE MODERATE INSTABILITY OVER EXTREME SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE THIS AFTERNOON. DIRECTIONAL WIND SHEAR WILL BE BETTER THAN YESTERDAY AND MAY CAUSE ISOLATED SUPER CELL THUNDERSTORMS LATER IN THE DAY...ESPECIALLY OVER THE NEBRASKA PANHANDLE. A 10 TO 20 PERCENT COVERAGE OF AFTERNOON THUNDERSTORMS IS EXPECTED OVER THE AREA. WCJIN-WYSE-WYNE PAL
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.