Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 101, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 16, 1997, 6:14 PM MDT for Laramie County, Wyoming. It was in force for 46 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, 6:14 PM MDT (00:14 UTC)
- Expired
- Aug 16, 1997, 7:00 PM MDT
- In force
- 46 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 00:17 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, 6:20 PM MDT | Hail 0.75 | Cheyenne, 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, 0.2 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 170017 RRA SVRCYS WYC021-170100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 614 PM MDT SAT AUG 16 1997 * SEVERE THUNDESTORM AND FLASH FLOOD WARNING FOR SOUTHWESTERN AND SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING * SEVERE THUNDERSTORM WARNING UNTIL 700 PM MDT FLASH FLOOD WARNING UNTIL 700 PM MDT * SOME LOCATIONS AFFECTED CHEYENNE BY 612 PM MDT ORCHARD VALLEY BY 612 PM MDT ARCHER ESTATES BY 631 PM MDT HILLSDALE BY 653 PM MDT * AT 612 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR IN THE VICINITY OF CHEYENNE MOVING EAST AT 25 MPH. STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE. TAKE SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL DOORS AND WINDOWS. IF YOU ARE DRIVING AND ENCOUNTER HEAVY RAIN OR HAIL...SLOW DOWN OR PULL TO THE SIDE OF THE ROAD UNTIL THE STORM PASSES. 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, 6:51 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.