Alert archive / Wyoming / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 2, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at May 1, 2001, 1:45 AM MDT for Campbell County, Wyoming. It was in force for 60 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
- May 1, 2001, 1:45 AM MDT (07:45 UTC)
- Expired
- May 1, 2001, 2:45 AM MDT
- In force
- 60 min
- Issued by
- NWS Rapid City, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Campbell County, WY
The radar
The Rapid City radar (KUDX), 217 km from the middle of the area, began a volume at 07:46 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 |
|---|---|---|---|
| May 1, 2:07 AM MDT | Thunderstorm Wind 60 M | Gillette Arpt, WY | |
| May 1, 2:42 AM MDT | Thunderstorm Wind 75 M | Echeta, 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
Riverton, WY (KRIW), launched 00:00Z, 7.8 hours before the alert went out and 264 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2788 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
NWS Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 30, 9:10 PM MDT, 4 hours 35 minutes earlier.
Area forecast discussion, Apr 30, 9:10 PM MDT, 4 hours 35 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 910 PM MDT MON APR 30 2001 CURRENT FCST ON TRACK. WL UPDATE FOR TIMING OF CLOUDS AND WL TWEEK WINDSa ABIT. .UNR...NONE.
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 2:51 AM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 54 min |
| May 1, 3:04 AM MDT | Severe Thunderstorm Warning | UNR | Lawrence | 56 min |
| May 1, 3:22 AM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins | 68 min |
| May 1, 3:42 AM MDT | Severe Thunderstorm Warning | UNR | Pennington | 63 min |
| May 1, 1:50 AM MDT | Severe Thunderstorm Warning | UNR | Crook | 40 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2001Every severe thunderstorm warning in 2001
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.