Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 45, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 31, 1998, 3:18 PM MDT for Fremont County, Wyoming. It was in force for 47 min. 3 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 31, 1998, 3:18 PM MDT (21:18 UTC)
- Expired
- Jul 31, 1998, 4:05 PM MDT
- In force
- 47 min
- Issued by
- NWS Riverton, WY
- Area
- Whole counties
County Fremont County, WY
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 3:35 PM MDT | Thunderstorm Wind 52 | Hudson, WY | Large tree limbs down. |
| Jul 31, 3:52 PM MDT | Thunderstorm Wind 52 | Riverton, WY | Large tree limbs down |
| Jul 31, 4:15 PM MDT | Thunderstorm Wind 52 | Shoshoni, WY | Large tree limbs down |
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
Grand Junction, CO (KGJT), launched 12:00Z, 9.3 hours before the alert went out and 435 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
- 11 J/kg
- Mixed-layer CIN
- -328 J/kg
- Mixed-layer LCL
- 2672 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 182 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.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:45 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln | 45 min |
| Jul 31, 4:03 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 32 min |
| Jul 31, 4:29 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs | 46 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.