Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 14, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 1, 1997, 3:58 PM MDT for Platte County, Wyoming. It was in force for 47 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
- Jun 1, 1997, 3:58 PM MDT (21:58 UTC)
- Expired
- Jun 1, 1997, 4:45 PM MDT
- In force
- 47 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Platte County, WY
The radar
The Cheyenne radar (KCYS), 110 km from the middle of the area, began a volume at 22:01 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 |
|---|---|---|---|
| Jun 1, 4:10 PM MDT | Hail 0.75 | Chugwater, 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
Rapid City, SD (KUNR), launched 12:00Z, 10.0 hours before the alert went out and 274 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
- 1 J/kg
- Mixed-layer CIN
- -382 J/kg
- Mixed-layer LCL
- 2462 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
036 WUUS1 KCYS 012159 RRA SVRCYS WYC031-012245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 358 PM MDT SUN JUN 1 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHERN PLATTE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 445 PM MDT * SOME AFFECTED LOCATIONS INCLUDE GLENDO BY 410 PM GLENDO STATE PARK 410 PM * AT 355 PM RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF GLENDO MOVING NORTHEAST AT 15 MPH. LARGE HAIL IS LIKELY WITH THIS STORM. SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES. JMH
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 1, 2:45 PM MDT, 1 hour 13 minutes before
WYZ059>060-020000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 245 PM MDT SUN JUN 1 1997 ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL WYOMING UNTIL 9 PM THIS EVENING... A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EAST CENTRAL WYOMING AND IS VALID UNTIL 9 PM THIS SUNDAY EVENING. THE COUNTIES IN EAST CENTRAL WYOMING INCLUDED IN THIS WATCH ARE CONVERSE AND NIOBRARA. SOME TOWNS INCLUDED IN THE WATCH ARE DOUGLAS AND LUSK. THE AIRMASS OVER EAST CENTRAL WYOMING IS MOIST AND UNSTABLE. A COLD FRONT APPROACHING THE AREA ALONG WITH GOOD SURFACE HEATING WILL HELP LIFT THIS UNSTABLE AIR TO FORM STRONG THUNDERSTORMS THIS AFTERNOON AND EVENING. SOME OF THESE WILL LIKELY BECOME SEVERE...PRODUCING THREE QUARTER INCH DIAMETER HAIL OR LARGER AND WIND GUSTS GREATER THAN 55 MPH. PEOPLE IN EAST CENTRAL WYOMING SHOULD BE ALERT TO APPROACHING STORMS. LISTEN TO NOAA WEATHER RADIO...LOCAL TELEVISION AND YOUR CABLE TELEVISION PROVIDER FOR POSSIBLE WARNINGS AND BE PREPARED TO SEEK SHELTER. REPORT ANY LARGE DAMAGING HAIL OR DAMAGING WIND GUSTS TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE. WCJIN-WYNE JMH
Special weather statement, Jun 1, 2:49 PM MDT, 1 hour 9 minutes before
WYZ059>060-020000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 245 PM MDT SUN JUN 1 1997 ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL WYOMING UNTIL 9 PM THIS EVENING... A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EAST CENTRAL WYOMING AND IS VALID UNTIL 9 PM THIS SUNDAY EVENING. THE COUNTIES IN EAST CENTRAL WYOMING INCLUDED IN THIS WATCH ARE CONVERSE AND NIOBRARA. SOME TOWNS INCLUDED IN THE WATCH ARE DOUGLAS AND LUSK. THE AIRMASS OVER EAST CENTRAL WYOMING IS MOIST AND UNSTABLE. A COLD FRONT APPROACHING THE AREA ALONG WITH GOOD SURFACE HEATING WILL HELP LIFT THIS UNSTABLE AIR TO FORM STRONG THUNDERSTORMS THIS AFTERNOON AND EVENING. SOME OF THESE WILL LIKELY BECOME SEVERE...PRODUCING THREE QUARTER INCH DIAMETER HAIL OR LARGER AND WIND GUSTS GREATER THAN 55 MPH. PEOPLE IN EAST CENTRAL WYOMING SHOULD BE ALERT TO APPROACHING STORMS. LISTEN TO NOAA WEATHER RADIO...LOCAL TELEVISION AND YOUR CABLE TELEVISION PROVIDER FOR POSSIBLE WARNINGS AND BE PREPARED TO SEEK SHELTER. REPORT ANY LARGE DAMAGING HAIL OR DAMAGING WIND GUSTS TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE. WCJIN-WYNE JMH
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 4:25 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 45 min |
| Jun 1, 4:31 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 44 min |
| Jun 1, 4:42 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 63 min |
| Jun 1, 5:07 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 48 min |
| Jun 1, 5:19 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 46 min |
| Jun 1, 5:48 PM MDT | Tornado Warning | CYS | Laramie | 17 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.