Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 73, NWS Riverton, WY

July 23, 2025Johnson County, Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 23, 2025, 1:12 PM MDT for Johnson County, Natrona County, Wyoming. It was in force for 12 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
Jul 23, 2025, 1:12 PM MDT (19:12 UTC)
Expired
Jul 23, 2025, 1:24 PM MDT
In force
12 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Johnson County, WY, Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 152 km from the middle of the area, began a volume at 19:13 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 nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.2 hours before the alert went out and 146 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.

Skew-T log-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2025-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 429 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2025-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
429 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1158 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

Open this sounding in Storm Lab

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 22, 11:04 PM MDTSpecial Weather StatementRIWNatrona26 min
Jul 22, 11:29 PM MDTSpecial Weather StatementRIWNatrona31 min
Jul 23, 12:54 PM MDTSevere Thunderstorm WarningRIWJohnson36 min
Jul 23, 1:05 PM MDTSpecial Weather StatementRIWNatrona40 min
Jul 23, 1:18 PM MDTSevere Thunderstorm WarningRIWJohnson42 min
Jul 23, 1:27 PM MDTSevere Thunderstorm WarningRIWJohnson21 min
Jul 23, 1:43 PM MDTSpecial Weather StatementRIWNatrona47 min
Jul 23, 2:31 PM MDTSpecial Weather StatementRIWNatrona29 min
Jul 23, 2:56 PM MDTSpecial Weather StatementRIW34 min
Jul 23, 2:57 PM MDTSpecial Weather StatementRIW18 min
Jul 23, 3:02 PM MDTSevere Thunderstorm WarningRIWNatrona13 min
Jul 23, 3:16 PM MDTSpecial Weather StatementRIWNatrona29 min
Jul 23, 5:01 PM MDTSpecial Weather StatementRIWJohnson29 min
Jul 23, 5:15 PM MDTSevere Thunderstorm WarningRIWJohnson19 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2025Every severe thunderstorm warning in 2025

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.