Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 91, NWS Riverton, WY

July 24, 2023Park County, Teton County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 24, 2023, 10:36 PM MDT for Park County, Teton County, Wyoming. It was in force for 39 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 24, 2023, 10:36 PM MDT (04:36 UTC)
Expired
Jul 24, 2023, 11:15 PM MDT
In force
39 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Park County, WY, Teton County, WY

The radar

The Riverton/Lander radar (KRIW), 183 km from the middle of the area, began a volume at 04:39 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 00:00Z, 4.6 hours before the alert went out and 187 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 00:00Z on 2023-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 229 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 00:00Z on 2023-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.193958Sfc1 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
229 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
2658 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

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 Jul 24, 4:16 PM MDT, 6 hours 20 minutes earlier.

Area forecast discussion, Jul 24, 4:16 PM MDT, 6 hours 20 minutes before
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Hazardous weather outlook, Jul 24, 3:35 AM MDT, 19 hours 1 minute before
Hazardous Weather Outlook
National Weather Service Riverton WY
335 AM MDT Mon Jul 24 2023

WYZ001>020-022>030-251300-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
335 AM MDT Mon Jul 24 2023

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Scattered thunderstorms across the area, mainly in the afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Elevated fire weather possible for much of the period with hot
temperatures, breezy conditions and low humidity.

Isolated to widely scattered showers and thunderstorms possible
each afternoon and evening, with the most numerous storms expected
Thursday and Friday.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Special weather statement, Jul 24, 7:49 PM MDT, 2 hours 47 minutes before
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Special weather statement, Jul 24, 8:43 PM MDT, 1 hour 53 minutes before
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Special weather statement, Jul 24, 9:30 PM MDT, 1 hour 6 minutes before
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Special weather statement, Jul 24, 9:54 PM MDT, 42 minutes before
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Special weather statement, Jul 24, 10:18 PM MDT, 18 minutes before
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Special weather statement, Jul 24, 10:32 PM MDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 6:15 PM MDTSpecial Weather StatementRIWFremont30 min
Jul 24, 7:35 PM MDTSpecial Weather StatementRIWJohnson25 min
Jul 24, 7:49 PM MDTSpecial Weather StatementRIWNatrona26 min
Jul 24, 8:43 PM MDTSpecial Weather StatementRIWLincoln47 min
Jul 24, 9:30 PM MDTSpecial Weather StatementRIWLincoln45 min
Jul 24, 9:54 PM MDTSpecial Weather StatementRIWTeton36 min
Jul 24, 10:18 PM MDTSpecial Weather StatementRIWSublette42 min
Jul 24, 10:32 PM MDTSpecial Weather StatementRIWTeton43 min
Jul 24, 10:59 PM MDTSpecial Weather StatementRIWFremont46 min
Jul 24, 11:12 PM MDTSpecial Weather StatementRIWPark48 min
Jul 24, 11:47 PM MDTSpecial Weather StatementRIWFremont28 min
Jul 24, 11:50 PM MDTSpecial Weather StatementRIW40 min
Jul 25, 12:18 AM MDTSpecial Weather StatementRIWFremont42 min
Jul 25, 12:27 AM MDTSpecial Weather StatementRIWHot Springs48 min
Jul 25, 1:03 AM MDTSpecial Weather StatementRIWBig Horn, Washakie42 min
Jul 25, 1:45 AM MDTSpecial Weather StatementRIWBig Horn, Washakie45 min
Jul 25, 4:55 PM MDTSpecial Weather StatementRIWSweetwater35 min
Jul 25, 5:43 PM MDTSpecial Weather StatementRIW32 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2023Every severe thunderstorm warning in 2023

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.