Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 28, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 19, 1997, 2:31 PM MDT for Fremont County, Sublette County, Teton County, Wyoming. It was in force for 59 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
- Jul 19, 1997, 2:31 PM MDT (20:31 UTC)
- Expired
- Jul 19, 1997, 3:30 PM MDT
- In force
- 59 min
- Issued by
- NWS Riverton, WY
- Area
- Whole counties
Counties Fremont County, WY, Sublette County, WY, Teton County, WY
The radar
The Riverton/Lander radar (KRIW), 102 km from the middle of the area, began a volume at 20:34 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 19, 2:33 PM MDT | Tornado F0 | Big Piney, 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 12:00Z, 8.5 hours before the alert went out and 108 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
- 160 J/kg
- Mixed-layer CIN
- -188 J/kg
- Mixed-layer LCL
- 1124 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 19, 12:33 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 42 min |
| Jul 19, 2:31 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs, Park | 59 min |
| Jul 19, 2:44 PM MDT | Tornado Warning | RIW | Sublette | 26 min |
| Jul 19, 3:39 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Park | 91 min |
| Jul 19, 4:56 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn | 89 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.