Alert archive / Wyoming / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 38, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 14, 1999, 2:26 PM MDT for Laramie County, Wyoming. It was in force for 34 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
- Jun 14, 1999, 2:26 PM MDT (20:26 UTC)
- Expired
- Jun 14, 1999, 3:00 PM MDT
- In force
- 34 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 20:28 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, 8.4 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
- 3 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 1026 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 14, 3:33 AM MDT, 10 hours 53 minutes earlier.
Area forecast discussion, Jun 14, 3:33 AM MDT, 10 hours 53 minutes before
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</html>In the hours before
Special weather statement, Jun 14, 10:05 AM MDT, 4 hours 21 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-142300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1005 AM MDT MON JUN 14 1999 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE WARNING AREA IS LOW TODAY. A COOL BUT MOIST AIR MASS REMAINS IN PLACE OVER SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE TODAY. AN UPPER LEVEL DISTURBANCE CURRENTLY UPSTREAM IN MONTANA WILL BE MOVING SOUTHEAST ACROSS THE THE COUNTY WARNING AREA THIS AFTERNOON AND EVENING. THIS WILL CAUSE THE AIR MASS OVER THE AREA TO DESTABILIZE. SCATTERED THUNDERSTORMS ARE ALREADY IN THE FORECAST...WITH A SLIGHT CHANCE FOR A FEW STORMS REACHING SEVERE LIMITS EAST OF THE LARAMIE RANGE INTO EAST CENTRAL WYOMING AND THE NEBRASKA PANHANDLE LATER IN THE DAY. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON INTO THE EVENING. WCJIN-WYSE-WYNE PAL
Special weather statement, Jun 14, 10:05 AM MDT, 4 hours 21 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-142300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1005 AM MDT MON JUN 14 1999 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE WARNING AREA IS LOW TODAY. A COOL BUT MOIST AIR MASS REMAINS IN PLACE OVER SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE TODAY. AN UPPER LEVEL DISTURBANCE CURRENTLY UPSTREAM IN MONTANA WILL BE MOVING SOUTHEAST ACROSS THE THE COUNTY WARNING AREA THIS AFTERNOON AND EVENING. THIS WILL CAUSE THE AIR MASS OVER THE AREA TO DESTABILIZE. SCATTERED THUNDERSTORMS ARE ALREADY IN THE FORECAST...WITH A SLIGHT CHANCE FOR A FEW STORMS REACHING SEVERE LIMITS EAST OF THE LARAMIE RANGE INTO EAST CENTRAL WYOMING AND THE NEBRASKA PANHANDLE LATER IN THE DAY. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON INTO THE EVENING. WCJIN-WYSE-WYNE PAL
Special weather statement, Jun 14, 10:50 AM MDT, 3 hours 36 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-152300- SEVERE WEATHER OUTLOOK...CORRECTED SPELLING NATIONAL WEATHER SERVICE CHEYENNE WY 1050 AM MDT MON JUN 14 1999 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE WARNING AREA IS LOW TODAY. THE AIR MASS OVER THE CHEYENNE COUNTY WARNING AREA WILL BE COOLER AND LESS UNSTABLE THAN YESTERDAY. THEREFORE...THE AFTERNOON AND EVENING THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE. THE STEERING FLOW ALOFT REMAINS WEAK SO STORM WILL BE SLOW MOVING. THEREFORE...THE MAIN THREAT FROM PM STORMS TODAY WILL BE THE POTENTIAL FOR HEAVY RAIN. AREAS OF THE WESTERN NEBRASKA PANHANDLE THAT HAD FLOOD PROBLEMS IN LOW LYING AREAS YESTERDAY WILL HAVE TO BE MONITORED AGAIN LATER IN THE DAY. SPOTTER ACTIVATION WILL LIKELY NOT BE NEEDED THIS AFTERNOON. WCJIN-WYSE-WYNE PAL
Special weather statement, Jun 14, 10:58 AM MDT, 3 hours 28 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-152300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1058 AM MDT MON JUN 14 1999 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE WARNING AREA IS LOW TODAY. THE AIR MASS OVER THE CHEYENNE COUNTY WARNING AREA WILL BE COOLER AND LESS UNSTABLE THAN YESTERDAY. THEREFORE...THE AFTERNOON AND EVENING THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE. THE STEARING FLOW ALOFT REMAINS WEAK SO STORM WILL BE SLOW MOVING. THEREFORE...THE MAIN THREAT FROM PM STORMS TODAY WILL BE THE POTENTIAL FOR HEAVY RAIN. AREAS OF THE WESTERN NEBRASKA PANHANDLE THAT HAD FLOOD PROBLEMS IN LOW LYING AREAS YESTERDAY WILL HAVE TO BE MONITORED AGAIN LATER IN THE DAY. SPOTTER ACTIVATION WILL LIKELY NOT BE NEEDED THIS AFTERNOON. WCJIN-WYSE-WYNE PAL
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 3:28 PM MDT | Severe Thunderstorm Warning | CYS | Scotts Bluff | 32 min |
| Jun 14, 4:00 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 45 min |
| Jun 14, 5:49 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 46 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1999Every severe thunderstorm warning in 1999
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.