Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 35, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 15, 1997, 3:55 PM MDT for Laramie County, Wyoming. It was in force for 30 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 15, 1997, 3:55 PM MDT (21:55 UTC)
- Expired
- Jun 15, 1997, 4:25 PM MDT
- In force
- 30 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 21:58 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, 9.9 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
- 62 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1525 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -73 m²/s²
- 0-3 km storm-relative helicity
- -77 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 152158 RRA SVRCYS WYC021-152225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 355 PM MDT SUN JUN 15 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHERN AND EASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 425 PM MDT * SOME AFFECTED LOCATIONS INCLUDE CHEYENNE NOW CARPENTER NOW BURNS NOW PINE BLUFFS BY 415 PM * AT 350 PM A LINE OF THUNDERSTORMS EXTENDED FROM 15 MILES NORTHWEST OF CHEYENNE TO 5 MILES EAST OF CARPENTER. THUNDERSTORMS CONTINUE TO DEVELOP AND ARE MOVING EAST AT 15 MPH. ONE TO ONE AND A HALF INCH HAIL AND HEAVY RAIN ARE POSSIBLE WITH THESE THUNDERSTORMS. THE HEAVY RAIN MAY PRODUCE LOCALIZED FLOODING. SPOTTERS HAVE REPORTED LARGE HAIL IN EXCESS OF THREE FOURTHS INCH IN DIAMETER. IF YOU ARE DRIVING IN THIS AREA...YOU SHOULD BE PREPARED TO PULL OFF THE ROAD FOR SHELTER AS THE THUNDERSTORMS APPROACH. WCJIN-WYSE 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, Jun 15, 10:10 AM MDT, 5 hours 45 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-160000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1010 AM MDT SUN JUN 15 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS LOW TODAY. SPOTTER ACTIVATION WILL NOT LIKELY BE REQUIRED. DISCUSSION...UPSLOPE NORTH WINDS BEHIND A COLD FRONT WILL BRING COOLER TEMPERATURES AND NUMEROUS SHOWERS TO THE NORTHERN PARTS OF THE OUTLOOK AREA TODAY. SOME THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON FROM DOUGLAS INTO THE NORTHERN NEBRASKA PANHANDLE BUT THESE WILL BE WEAK. OVER EXTREME SOUTHEAST WYOMING AND THE SOUTHERN NEBRASKA PANHANDLE... THE AIR MASS WILL STILL BE MOIST AND UNSTABLE TODAY. THE DEGREE OF INSTABILITY HOWEVER WILL BE LESS THAN SATURDAY DUE TO THE APPROACH OF THE COOLER WEATHER FROM THE NORTH. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON AND EVENING BUT ONLY A FEW OF THESE WILL PRODUCE SMALL HAIL AND LOCALLY HEAVY RAIN. WCJIN-WYSE-WYNE JLH
Special weather statement, Jun 15, 10:11 AM MDT, 5 hours 44 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-160000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1010 AM MDT SUN JUN 15 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS LOW TODAY. SPOTTER ACTIVATION WILL NOT LIKELY BE REQUIRED. DISCUSSION...UPSLOPE NORTH WINDS BEHIND A COLD FRONT WILL BRING COOLER TEMPERATURES AND NUMEROUS SHOWERS TO THE NORTHERN PARTS OF THE OUTLOOK AREA TODAY. SOME THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON FROM DOUGLAS INTO THE NORTHERN NEBRASKA PANHANDLE BUT THESE WILL BE WEAK. OVER EXTREME SOUTHEAST WYOMING AND THE SOUTHERN NEBRASKA PANHANDLE... THE AIR MASS WILL STILL BE MOIST AND UNSTABLE TODAY. THE DEGREE OF INSTABILITY HOWEVER WILL BE LESS THAN SATURDAY DUE TO THE APPROACH OF THE COOLER WEATHER FROM THE NORTH. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON AND EVENING BUT ONLY A FEW OF THESE WILL PRODUCE SMALL HAIL AND LOCALLY HEAVY RAIN. WJCJIN-WYSE-WYNE JLH
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 3:08 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 47 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1997Every severe thunderstorm warning in 1997
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.