Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 90, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 1, 1998, 10:01 PM MDT for Niobrara County, Wyoming. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 1, 1998, 10:01 PM MDT (04:01 UTC)
- Expired
- Jul 1, 1998, 10:45 PM MDT
- In force
- 44 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Niobrara County, WY
The radar
The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 04:04 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.
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 4.0 hours before the alert went out and 171 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
- 1135 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 1329 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 8.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 020401 RRA SVRCYS WYC027-020445- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1001 PM MDT WED JUL 1 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN NIOBRARA COUNTY IN EASTERN WYOMING * UNTIL 1045 PM MDT * AT 955 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 40 MILES NORTH OF LUSK...OR 10 MILES NORTHWEST OF REDBIRD...MOVING EAST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... REDBIRD BY 1040 PM MDT MULE CREEK JUNCTION BY 1040 MDT DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! THE SLOW MOVEMENT OF THIS STORM MAY CAUSE SOME LOCALIZED FLOODING. WCJIN-WYNE SULLIVAN
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 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, 5:31 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.