Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 102, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 16, 1997, 6:51 PM MDT for Laramie County, Wyoming. It was in force for 59 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 16, 1997, 6:51 PM MDT (00:51 UTC)
- Expired
- Aug 16, 1997, 7:50 PM MDT
- In force
- 59 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 00:52 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 16, 7:15 PM MDT | Thunderstorm Wind 52 | Carpenter, WY |
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 00:00Z, 0.9 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
- 1611 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1576 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
647 WUUS1 KCYS 170053 RRA SVRCYS WYC021-170150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 651 PM MDT SAT AUG 16 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 750 PM MDT * SOME LOCATIONS AFFECTED CARPENTER BY 702 PM MDT * AT 644 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR 14 MILES EAST OF CHEYENNE OR 9 MILES WEST OF CARPENTER MOVING SOUTHEAST AT 30 MPH. DIME SIZE HAIL...DAMAGING WIND GUSTS TO 60 MPH AND HEAVY RAINS WERE REPORTED IN THE CHEYENNE AREA WITH THIS STORM. IF YOU ARE DRIVING AND ENCOUNTER HEAVY RAIN OR HAIL...SLOW DOWN OR PULL TO THE SIDE OF THE ROAD UNTIL THE STORM PASSES. THIS IS A DANGEROUS STORM...SEEK SHELTER INDOORS. THIS SEVERE THUNDERSTORM WARNING REPLACES THE PREVIOUS WARNING FOR SOUTHWEST AND SOUTHCENTRAL WYOMING. THE FLASH FLOOD WARNING FOR SOUTHWEST AND SOUTHCENTRAL WYOMING EXPIRES AT 7 PM. WCJIN-WYSE PAL
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 6:03 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 62 min |
| Aug 16, 6:14 PM MDT | Flash Flood Warning | CYS | Laramie | 46 min |
| Aug 16, 6:14 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 46 min |
| Aug 16, 6:51 PM MDT | Flash Flood Warning | CYS | Laramie | 59 min |
| Aug 16, 8:09 PM MDT | Flash Flood Warning | CYS | Laramie | 56 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; radar from the NEXRAD Level II archive.