Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 52, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 20, 1997, 7:03 PM MDT for Platte County, Wyoming. It was in force for 47 min. 2 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
- Jun 20, 1997, 7:03 PM MDT (01:03 UTC)
- Expired
- Jun 20, 1997, 7:50 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 01:04 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 20, 7:30 PM MDT | Hail 0.75 | Guernsey, WY | |
| Jun 20, 7:35 PM MDT | Hail 0.88 | Guernsey, 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 00:00Z, 1.1 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
- 63 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 785 m above ground
- 0-6 km bulk shear
- 85 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
692 WUUS1 KCYS 210106 SVRCYS WYC031-210150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED TO LOCATION OF STORM NATIONAL WEATHER SERVICE CHEYENNE WY 703 PM MDT FRI JUN 20 1997 * SEVERE THUNDERSTORM WARNING FOR EASTERN PLATTE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 750 PM MDT * SOME AFFECTED LOCATIONS INCLUDE GUERSNEY 715 PM GUERSNEY STATE PARK 715 PM * AT 701 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES NORTHEAST OF WHEATLAND. MOVEMENT WAS NORTHEAST AT 25 MPH. THIS IS A DANGEROUS STORM. SEEK SHELTER IN A STURDY BUILDING. 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, Jun 20, 2:29 PM MDT, 4 hours 34 minutes before
WYZ060-068-NEZ001>003-019>021-054-055-210300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 230 PM MDT FRI JUN 20 1997 A TORNADO WATCH HAS BEEN ISSUED FOR THE NEBRASKA PANHANDLE AND PARTS OF SOUTHEAST WYOMING AND IS VALID UNTIL 9 PM. COUNTIES IN THE PANHANDLE INCLUDE SIOUX...DAWES...BOX BUTTE...MORRILL ...CHEYENNE...SCOTTS BLUFF...BANNER AND KIMBALL. SOME CITIES INCLUDED IN THE WATCH ARE HARRISON...CHADRON...ALLIANCE...BRIDGEPORT...SIDNEY ...KIMBALL...HARRISBURG...AND SCOTTSBLUFF/GERING. COUNTIES IN WYOMING INCLUDED IN THE WATCH ARE GOSHEN...AND SOUTHERN NIOBRARA. SOME CITIES AND TOWNS IN THE WATCH ARE LUSK...AND TORRINGTON. A MOIST AND UNSTABLE AIRMASS IS IN PLACE OVER SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE. AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA WILL RESULT IN SOME STRONG THUNDERSTORMS. SOME OF THESE STORMS COULD COULD PRODUCE LARGE HAIL AND TORNADOES ALONG WITH HEAVY RAIN. PEOPLE IN THE WATCH AREA SHOULD BE ALERT TO APPROACHING STORMS AND BE PREPARED TO SEEK SHELTER. LISTEN TO NOAA WEATHER RADIO OR YOUR LOCAL TELEVISION AND RADIO STATIONS AS WELL AS YOUR CABLE TELEVISION PROVIDER FOR LATER STATEMENTS AND WARNING. WCJIN-WYNE-WYSE LRE
Special weather statement, Jun 20, 2:30 PM MDT, 4 hours 33 minutes before
WYZ060-068-NEZ001>003-019>021-054-055-210300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 230 PM MDT FRI JUN 20 1997 A TORNADO WATCH HAS BEEN ISSUED FOR THE NEBRASKA PANHANDLE AND PARTS OF SOUTHEAST WYOMING AND IS VALID UNTIL 9 PM. COUNTIES IN THE PANHANDLE INCLUDE SIOUX...DAWES...BOX BUTTE...MORRILL ...CHEYENNE...SCOTTS BLUFF...BANNER AND KIMBALL. SOME CITIES INCLUDED IN THE WATCH ARE HARRISON...CHADRON...ALLIANCE...BRIDGEPORT...SIDNEY ...KIMBALL...HARRISBURG...AND SCOTTSBLUFF/GERING. COUNTIES IN WYOMING INCLUDED IN THE WATCH ARE GOSHEN...AND SOUTHERN NIOBRARA. SOME CITIES AND TOWNS IN THE WATCH ARE LUSK...AND TORRINGTON. A MOIST AND UNSTABLE AIRMASS IS IN PLACE OVER SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE. AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA WILL RESULT IN SOME STRONG THUNDERSTORMS. SOME OF THESE STORMS COULD COULD PRODUCE LARGE HAIL AND TORNADOES ALONG WITH HEAVY RAIN. PEOPLE IN THE WATCH AREA SHOULD BE ALERT TO APPROACHING STORMS AND BE PREPARED TO SEEK SHELTER. LISTEN TO NOAA WEATHER RADIO OR YOUR LOCAL TELEVISION AND RADIO STATIONS AS WELL AS YOUR CABLE TELEVISION PROVIDER FOR LATER STATEMENTS AND WARNING. WCJIN-WYNE-WYSE LRE
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 7:17 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 48 min |
| Jun 20, 8:03 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 17 min |
| Jun 20, 8:13 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 47 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.