Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 90, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 2, 1997, 7:57 PM MDT for Laramie County, Wyoming. It was in force for 33 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 2, 1997, 7:57 PM MDT (01:57 UTC)
- Expired
- Aug 2, 1997, 8:30 PM MDT
- In force
- 33 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 01:57 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 2, 8:05 PM MDT | Hail 0.75 | Pine Bluffs, 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, 2.0 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
- 425 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1911 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
590 WUUS1 KCYS 030155 SVRCYS WYC021-030230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTION TO DATE AND TIME NATIONAL WEATHER SERVICE CHEYENNE WY 757 PM MDT SAT AUG 02 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHEAST LARAMIE COUNTY IN SOUTHEAST WYOMING * UNTIL 830 PM MDT * SOME LOCATIONS AFFECTED THIS STORM WILL REMAIN IN RURAL AREAS * AT 750 PM DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF PINE BLUFFS MOVING SOUTHEAST AT 15 MPH. LARGE HAIL IS LIKELY WITH THIS STORM. SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES. 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, Aug 2, 2:40 PM MDT, 5 hours 17 minutes before
WYZ059-060-067-068-022145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 240 PM MDT SAT AUG 2 1997 ...HEAVY RAINS OVER PARTS OF EAST CENTRAL AND SOUTHEAST WYOMING... AT 237 PM MDT...THUNDERSTORMS WITH HEAVY RAINFALL HAD DEVELOPED OVER CONVERESE AND NORTHERN PLATTE COUNTIES. THESE STORMS WERE GENERALLY LOCATED FROM 15 MILES NORTH OF WHEATLAND TO NEAR DOUGLAS AND GLENROCK. THE STORMS WERE MOVING EAST AT 15 TO 20 MPH AND WILL IMPACT THE TOWNS OF DOUGLAS AND DEER CREEK THROUGH 3:30 PM. THESE STORMS WILL THEN MOVE INTO THE VICINITY OF KEELINE AND LUSK AND INTO NORTHERN SECTIONS OF GOSHEN COUNTY TOWARD 3:00 PM OR 3:30 PM. PEOPLE IN THESE AREAS SHOULD BE PREPARED FOR BRIEF HEAVY RAINFALL...POSSIBLE UP TO A HALF AN INCH IN LESS THAN 30 MINUTES...AND WIND GUSTS TO 35 MPH. THERE MAY ALSO BE SOME VERY SMALL HAIL WITH THE STRONGEST STORMS. WCJIN-WYSE DMM
Special weather statement, Aug 2, 2:41 PM MDT, 5 hours 16 minutes before
WYZ059-060-067-068-022145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 240 PM MDT SAT AUG 2 1997 ...HEAVY RAINS OVER PARTS OF EAST CENTRAL AND SOUTHEAST WYOMING... AT 237 PM MDT...THUNDERSTORMS WITH HEAVY RAINFALL HAD DEVELOPED OVER CONVERESE AND NORTHERN PLATTE COUNTIES. THESE STORMS WERE GENERALLY LOCATED FROM 15 MILES NORTH OF WHEATLAND TO NEAR DOUGLAS AND GLENROCK. THE STORMS WERE MOVING EAST AT 15 TO 20 MPH AND WILL IMPACT THE TOWNS OF DOUGLAS AND DEER CREEK THROUGH 3:30 PM. THESE STORMS WILL THEN MOVE INTO THE VICINITY OF KEELINE AND LUSK AND INTO NORTHERN SECTIONS OF GOSHEN COUNTY TOWARD 3:00 PM OR 3:30 PM. PEOPLE IN THESE AREAS SHOULD BE PREPARED FOR BRIEF HEAVY RAINFALL...POSSIBLE UP TO A HALF AN INCH IN LESS THAN 30 MINUTES...AND WIND GUSTS TO 35 MPH. THERE MAY ALSO BE SOME VERY SMALL HAIL WITH THE STRONGEST STORMS. WCJIN-WYSE DMM
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 2:38 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 42 min |
| Aug 3, 3:24 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 41 min |
| Aug 3, 3:32 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 43 min |
| Aug 3, 4:00 PM MDT | Tornado Warning | CYS | Laramie | 45 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.