Alert archive / Wyoming / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 111, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Aug 22, 2018, 1:23 PM MDT for Sweetwater County, Wyoming. It was in force for 33 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
- Aug 22, 2018, 1:23 PM MDT (19:23 UTC)
- Expired
- Aug 22, 2018, 1:56 PM MDT
- In force
- 33 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Sweetwater County, WY
The radar
The Riverton/Lander radar (KRIW), 160 km from the middle of the area, began a volume at 19:23 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 22, 12:51 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 7.4 hours before the alert went out and 162 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
- 946 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 9:59 AM MDT | Special Weather Statement | RIW | Lincoln | 46 min |
| Aug 22, 10:40 AM MDT | Special Weather Statement | RIW | Lincoln | 50 min |
| Aug 22, 10:48 AM MDT | Special Weather Statement | RIW | Lincoln | 42 min |
| Aug 22, 11:24 AM MDT | Special Weather Statement | RIW | 21 min | |
| Aug 22, 11:33 AM MDT | Special Weather Statement | RIW | 42 min | |
| Aug 22, 11:38 AM MDT | Special Weather Statement | RIW | Lincoln | 37 min |
| Aug 22, 12:25 PM MDT | Special Weather Statement | RIW | Sublette | 50 min |
| Aug 22, 12:56 PM MDT | Special Weather Statement | RIW | 49 min | |
| Aug 22, 1:01 PM MDT | Special Weather Statement | RIW | 44 min | |
| Aug 22, 1:09 PM MDT | Special Weather Statement | RIW | 51 min | |
| Aug 22, 2:00 PM MDT | Special Weather Statement | RIW | Hot Springs | 45 min |
| Aug 22, 2:04 PM MDT | Special Weather Statement | RIW | Fremont | 26 min |
| Aug 22, 2:13 PM MDT | Special Weather Statement | RIW | Sweetwater | 32 min |
| Aug 22, 2:17 PM MDT | Special Weather Statement | RIW | Sweetwater | 43 min |
| Aug 22, 2:32 PM MDT | Special Weather Statement | RIW | Fremont | 28 min |
| Aug 22, 3:27 PM MDT | Special Weather Statement | RIW | 33 min | |
| Aug 22, 3:31 PM MDT | Special Weather Statement | RIW | 29 min | |
| Aug 22, 3:45 PM MDT | Special Weather Statement | RIW | Sweetwater | 45 min |
| Aug 22, 3:57 PM MDT | Special Weather Statement | RIW | Johnson | 33 min |
| Aug 22, 5:32 PM MDT | Special Weather Statement | RIW | Lincoln | 43 min |
| Aug 22, 5:41 PM MDT | Special Weather Statement | RIW | 34 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2018Every severe thunderstorm warning in 2018
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.