Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 95, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 2, 1998, 5:31 PM MDT for Laramie County, Wyoming. It was in force for 49 min. 4 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
- Jul 2, 1998, 5:31 PM MDT (23:31 UTC)
- Expired
- Jul 2, 1998, 6:20 PM MDT
- In force
- 49 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 23:30 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 |
|---|---|---|---|
| Jul 2, 5:35 PM MDT | Hail 1 | Cheyenne, WY | Spotters reported quarter size hail on the Terry Bison Ranch 10 miles southwest of Cheyenne. |
| Jul 2, 5:38 PM MDT | Hail 1 | Cheyenne, WY | A storm produced quarter size hail 9 miles south of Cheyenne. The hail covered the ground and wind driven hail broke some automobile windshields. |
| Jul 2, 6:00 PM MDT | Thunderstorm Wind 61 | Cheyenne, WY | A wind gust of 70 mph was recorded in a thunderstorm 33 miles northeast of Cheyenne. |
| Jul 2, 6:15 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 12:00Z, 11.5 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
- 56 J/kg
- Mixed-layer CIN
- -473 J/kg
- Mixed-layer LCL
- 2148 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
295 WUUS1 KCYS 022330 RRA SVRCYS WYC021-030020- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 531 PM MDT THU JUL 2 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 620 PM MDT * AT 530 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF CHEYENNE... MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... SOUTHERN CHEYENNE THROUGH 545 PM MDT THIS IS A DANGEROUS STORM STAY INDOORS AWAY FROM WINDOWS. ROBINSON
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 7:10 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 60 min |
| Jul 1, 7:59 PM MDT | Tornado Warning | CYS | Converse | 31 min |
| Jul 1, 8:30 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 60 min |
| Jul 1, 9:22 PM MDT | Flash Flood Warning | CYS | Converse | 6 hr |
| Jul 1, 9:33 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 47 min |
| Jul 1, 10:01 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 44 min |
| Jul 2, 3:47 PM MDT | Tornado Warning | CYS | Albany | 28 min |
| Jul 2, 3:53 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 47 min |
| Jul 2, 4:35 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jul 2, 4:54 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 41 min |
| Jul 2, 5:51 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 49 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1998Every severe thunderstorm warning in 1998
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.