Alert archive / Wyoming / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 43, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 25, 2015, 4:54 AM MDT for Johnson County, Wyoming. It was in force for 36 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
- Jun 25, 2015, 4:54 AM MDT (10:54 UTC)
- Expired
- Jun 25, 2015, 5:30 AM MDT
- In force
- 36 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 10:55 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 |
|---|---|---|---|
| May 4, 1:08 PM MDT | Severe Thunderstorm Watch | SPC | 112 days |
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 10.9 hours before the alert went out and 296 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
- 696 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1045 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.5
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 Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 24, 1:20 PM MDT, 15 hours 34 minutes earlier.
Area forecast discussion, Jun 24, 1:20 PM MDT, 15 hours 34 minutes before
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</html>The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 12:44 AM MDT | Special Weather Statement | RIW | Johnson | 76 min |
| Jun 25, 1:14 AM MDT | Severe Thunderstorm Warning | RIW | Johnson | 31 min |
| Jun 25, 4:39 AM MDT | Special Weather Statement | RIW | 51 min | |
| Jun 25, 6:15 AM MDT | Special Weather Statement | RIW | Johnson | 60 min |
| Jun 25, 6:47 AM MDT | Special Weather Statement | RIW | Johnson | 28 min |
| Jun 25, 7:00 AM MDT | Special Weather Statement | RIW | Johnson | 60 min |
| Jun 25, 8:13 AM MDT | Special Weather Statement | RIW | Johnson | 47 min |
| Jun 25, 9:47 AM MDT | Special Weather Statement | RIW | Johnson | 43 min |
| Jun 25, 1:43 PM MDT | Special Weather Statement | RIW | Natrona | 47 min |
| Jun 25, 2:01 PM MDT | Special Weather Statement | RIW | Natrona | 44 min |
| Jun 25, 2:03 PM MDT | Special Weather Statement | RIW | Fremont | 42 min |
| Jun 25, 2:09 PM MDT | Special Weather Statement | RIW | Johnson | 51 min |
| Jun 25, 2:27 PM MDT | Special Weather Statement | RIW | Fremont | 48 min |
| Jun 25, 2:38 PM MDT | Special Weather Statement | RIW | Natrona | 37 min |
| Jun 25, 3:15 PM MDT | Special Weather Statement | RIW | Natrona | 45 min |
| Jun 25, 3:33 PM MDT | Special Weather Statement | RIW | Natrona | 42 min |
| Jun 25, 3:55 PM MDT | Special Weather Statement | RIW | Natrona | 50 min |
| Jun 25, 4:05 PM MDT | Special Weather Statement | RIW | Johnson | 40 min |
| Jun 25, 4:11 PM MDT | Special Weather Statement | RIW | Natrona | 49 min |
| Jun 25, 4:20 PM MDT | Special Weather Statement | RIW | Natrona | 25 min |
| Jun 25, 4:26 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 34 min |
| Jun 25, 4:41 PM MDT | Special Weather Statement | RIW | Natrona | 34 min |
| Jun 25, 5:04 PM MDT | Special Weather Statement | RIW | Natrona | 41 min |
| Jun 25, 5:11 PM MDT | Areal Flood Advisory | RIW | Natrona | 3 hr |
| Jun 25, 5:14 PM MDT | Special Weather Statement | RIW | Natrona | 31 min |
| Jun 25, 5:32 PM MDT | Special Weather Statement | RIW | 28 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2015Every severe thunderstorm warning in 2015
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.