Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 94, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 12, 1997, 3:05 PM MDT for Laramie County, Wyoming. It was in force for 45 min. 1 report 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
- Aug 12, 1997, 3:05 PM MDT (21:05 UTC)
- Expired
- Aug 12, 1997, 3:50 PM MDT
- In force
- 45 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 21:06 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 3:27 PM MDT | Thunderstorm Wind 72 | Cheyenne, WY | Reported at F.E. Warren Air Force Base. |
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, 9.1 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
- 1399 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 0 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 122105 RRA SVRCYS WYC021-122150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 305 PM MDT TUE AUG 12 1997 * SEVERE THUNDERSTORM WARNING FOR CENTRAL AND EASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 350 PM MDT * SOME AFFECTED LOCATIONS INCLUDE CHEYENNE * AT 304 PM MDT...DOPPLER RADAR INDICATED A LINE THUNDERSTORMS MOVING EAST AT 30 MPH. THIS STORM WILL PRODUCE WIND GUSTS OVER 55 MPH ALONG WITH HAIL UP TO 3/4 OF AN INCH. STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE. TAKE SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL DOORS AND WINDOWS. WCJIN-WYSE DMM
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, Aug 12, 10:08 AM MDT, 4 hours 57 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-130000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1008 AM MDT TUE AUG 12 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MODERATE TODAY. SPOTTER ACTIVATION MIGHT BE NECESSARY. DISCUSSION...CLEARING WITH GOOD SURFACE WARMING AND PLENTY OF LOW LEVEL MOISTURE SHOULD BE CONDUCIVE FOR SOME THUNDERSTORM DEVELOPMENT THIS AFTERNOON. A FEW THUNDERSTORMS COULD HAVE LOCALLY HEAVY RAINS. WCJIN-WYSE-WYNE WTP
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; radar from the NEXRAD Level II archive.