Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 59, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 23, 1997, 8:19 PM MDT for Goshen County, Wyoming. It was in force for 41 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 23, 1997, 8:19 PM MDT (02:19 UTC)
- Expired
- Jun 23, 1997, 9:00 PM MDT
- In force
- 41 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Goshen County, WY
The radar
The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 02:22 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 23, 8:40 PM MDT | Hail 1.5 | Jay Em, 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, 2.3 hours before the alert went out and 251 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
- 1237 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1289 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.9
The text
As transmitted, in the capitals the NWS used until 2016.
688 WUUS1 KCYS 240220 RRA SVRCYS WYC015-240300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 819 PM MDT MON JUN 23 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GOSHEN COUNTY IN SOUTHEASTERN WYOMING * UNTIL 900 PM MDT * THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS...BUT APPROACH THE JAY EM AREA AFTER 845 PM. * AT 816 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR 23 MILES SOUTH OF LUSK OR 15 MILES WEST OF JAY EM MOVING NORTHEAST AT 15 MPH. THIS STORM ALSO WAS SHOWING SOME ROTATION...AND MAY BE ABLE TO PRODUCE A FUNNEL CLOUD OR EVEN A TORNADO. LARGE HAIL IS LIKELY WITH THIS STORM. SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES. WCJIN-WYSE JAD
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 23, 7:58 PM MDT, 21 minutes before
WYZ067-068-240300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 758 PM MDT MON JUN 23 1997 ...A STRONG THUNDERSTORM WAS LOCATED IN FAR NORTHEAST PLATTE COUNTY AT 755 PM... THE STORM WAS ABOUT 15 MILES NORTH OF GUERNSEY...OR ABOUT 25 MILES SOUTHWEST OF LUSK. IT WAS MOVING NORTHEAST AT 10 TO 15 MPH...AND WILL BE MOVING ACROSS THE NORTHWEST CORNER OF GOSHEN COUNTY THROUGH 9 PM. MARBLE SIZE HAIL OR LARGER ALONG WITH HEAVY RAIN ARE LIKELY WITH THIS STORM. PEOPLE IN NORTHEAST PLATTE AND NORTHWEST GOSHEN COUNTIES SHOULD BE ON THE LOOKOUT FOR THIS STORM THROUGH 9 PM. SINCE IT IS MOVING RATHER SLOWLY...SOME LOCALIZED FLOODING COULD OCCUR IN THE HILLS NORTH OF THE TOWNS OF SUNRISE AND HARTVILLE ALONG HIGHWAY 270. WCJIN-WYSE JAD
Special weather statement, Jun 23, 7:59 PM MDT, 20 minutes before
WYZ067-068-240300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 758 PM MDT MON JUN 23 1997 ...A STRONG THUNDERSTORM WAS LOCATED IN FAR NORTHEAST PLATTE COUNTY AT 755 PM... THE STORM WAS ABOUT 15 MILES NORTH OF GUERNSEY...OR ABOUT 25 MILES SOUTHWEST OF LUSK. IT WAS MOVING NORTHEAST AT 10 TO 15 MPH...AND WILL BE MOVING ACROSS THE NORTHWEST CORNER OF GOSHEN COUNTY THROUGH 9 PM. MARBLE SIZE HAIL OR LARGER ALONG WITH HEAVY RAIN ARE LIKELY WITH THIS STORM. PEOPLE IN NORTHEAST PLATTE AND NORTHWEST GOSHEN COUNTIES SHOULD BE ON THE LOOKOUT FOR THIS STORM THROUGH 9 PM. SINCE IT IS MOVING RATHER SLOWLY...SOME LOCALIZED FLOODING COULD OCCUR IN THE HILLS NORTH OF THE TOWNS OF6 SUNRISE AND HARTVILLE ALONG HIGHWAY 270. WCJIN-WYSE JAD
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:58 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 32 min |
| Jun 23, 9:12 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 48 min |
| Jun 23, 9:26 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 34 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.