Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 30, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 12, 1997, 1:35 PM MDT for Laramie County, Wyoming. It was in force for 45 min. 2 reports 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 12, 1997, 1:35 PM MDT (19:35 UTC)
- Expired
- Jun 12, 1997, 2:20 PM MDT
- In force
- 45 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 12, 1:40 PM MDT | Hail 2.5 | Cheyenne, WY | |
| Jun 12, 1:45 PM MDT | Hail 1 | Cheyenne, WY | Hail piled to a 4 inch depth. |
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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 7.6 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
- 48 J/kg
- Mixed-layer CIN
- -253 J/kg
- Mixed-layer LCL
- 1774 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 52 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 121934 RRA SVRCYS WYC021-122020- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 135 PM MDT THU JUN 12 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN AND SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 220 PM MDT * SOME LOCATIONS AFFECTED CHEYENNE BY 145 PM MDT * AT 130 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR AND SPOTTER REPORTS 16 MILES WEST OF CHEYENNE OR 6 MILES SOUTHWEST OF SILVER CROWN MOVING NORTHEAST AT 15 MPH. AT 125 A SPOTTER REPORTED HAIL ONE INCH IN DIAMETER AT MILE MARKER 348 ON INTERSTATE 80 12 MILES WEST OF CHEYENNE. THIS IS A DANGEROUS STORM. TAKE COVER NOW AND REMAIN AWAY FROM WINDOWS. WCJIN-WYSE ROBINSON &
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 12, 10:10 AM MDT, 3 hours 25 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-130000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1010 AM MDT THU JUN 12 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MEDIUM OVER SOUTHEAST WYOMING AND THE SOUTHERN PANHANDLE TODAY...LOW IN THE NORTHERN NEBRASKA PANHANDLE. SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON IN SOUTHEAST WYOMING AND THE SOUTHERN NEBRASKA PANHANDLE. DISCUSSION...LOW LEVEL MOISTURE HAS RETURNED TO MOST OF THE AREA. DAYTIME HEATING WILL CAUSE THE AIR MASS TO BECOME UNSTABLE DURING THE AFTERNOON AND EVENING IN SOUTHEAST WYOMING AND THE SOUTHERN PANHANDLE ...AND SCATTERED THUNDERSTORMS WILL DEVELOP. A FEW OF THESE MAY BECOME STRONG ESPECIALLY DURING THE LATE AFTERNOON AND EVENING HOURS. IN THE NORTHERN PANHANDLE...LOW CLOUDS WILL LIMIT SOLAR HEATING AND THUNDERSTORM DEVELOPMENT THIS AFTERNOON. < WCJIN-WYSE-WYNE JLH
Special weather statement, Jun 12, 10:12 AM MDT, 3 hours 23 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-130000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1010 AM MDT THU JUN 12 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MEDIUM OVER SOUTHEAST WYOMING AND THE SOUTHERN PANHANDLE TODAY...LOW IN THE NORTHERN NEBRASKA PANHANDLE. SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON IN SOUTHEAST WYOMING AND THE SOUTHERN NEBRASKA PANHANDLE. DISCUSSION...LOW LEVEL MOISTURE HAS RETURNED TO MOST OF THE AREA. DAYTIME HEATING WILL CAUSE THE AIR MASS TO BECOME UNSTABLE DURING THE AFTERNOON AND EVENING IN SOUTHEAST WYOMING AND THE SOUTHERN PANHANDLE ...AND SCATTERED THUNDERSTORMS WILL DEVELOP. A FEW OF THESE MAY BECOME STRONG ESPECIALLY DURING THE LATE AFTERNOON AND EVENING HOURS. IN THE NORTHERN PANHANDLE...LOW CLOUDS WILL LIMIT SOLAR HEATING AND THUNDERSTORM DEVELOPMENT THIS AFTERNOON. < WCJIN-WYSE-WYNE JLH
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 2:19 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 46 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.