Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 100, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 16, 1997, 6:03 PM MDT for Laramie County, Wyoming. It was in force for 62 min. 3 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
- Aug 16, 1997, 6:03 PM MDT (00:03 UTC)
- Expired
- Aug 16, 1997, 7:05 PM MDT
- In force
- 62 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 00:07 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, 6:06 PM MDT | Hail 0.75 | Cheyenne, WY | |
| Aug 16, 6:20 PM MDT | Hail 0.75 | Cheyenne, WY | |
| 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, 0.1 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
- 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.
000 TTAA00 KCYS 170002 RRA SVRCYS WYC021-170105- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 603 PM MDT SAT AUG 16 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN AND SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 705 PM MDT * SOME LOCATIONS AFFECTED F.E. WARREN AFB BY 608 PM MDT CHEYENNE BY 614 PM MDT ORCHARD VALLEY BY 615 PM MDT ARCHER ESTATES BY 634 PM MDT * AT 600 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR 6 MILES NORTHWEST OF CHEYENNE OR 4 MILES NORTHWEST OF F.E. WARREN AFB MOVING EAST AT 25 MPH. AT 6 PM RADAR INDICARED A SEVERE THUNDERSTORM 6 MILES NORTHWEST OF CHEYENNE MOVINGEAST SOUTHEAST AT 20 MPH. LARGE HAIL IS LIKELY WITH THIS STORM. SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES. STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE. TAKE SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL DOORS AND WINDOWS. PAL
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 6:51 PM MDT | Severe Thunderstorm 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.