Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 95, NWS Riverton, WY

July 26, 2023Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 26, 2023, 4:41 PM MDT for Natrona County, Wyoming. It was in force for 34 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 26, 2023, 4:41 PM MDT (22:41 UTC)
Expired: Jul 26, 2023, 5:15 PM MDT
In force: 34 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 22:43 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

Grand Junction, CO (KGJT), launched 12:00Z, 10.7 hours before the alert went out and 449 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 24 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 2677 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 26, 4:03 PM MDT, 38 minutes earlier.

Area forecast discussion, Jul 26, 4:03 PM MDT, 38 minutes before

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Hazardous weather outlook, Jul 26, 2:43 AM MDT, 13 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
243 AM MDT Wed Jul 26 2023

WYZ001>020-022>030-271300-
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-
243 AM MDT Wed Jul 26 2023

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Isolated to widely scattered afternoon and evening showers and
thunderstorms, mainly in the southern half of the area. Strong wind
gusts are the main threat from any storm.

Locally elevated fire weather possible this afternoon.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...Scattered afternoon thunderstorms. Some storms could be
strong to locally severe.

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

.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 26, 3:19 PM MDT, 1 hour 22 minutes before

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Special weather statement, Jul 26, 3:42 PM MDT, 59 minutes before

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Special weather statement, Jul 26, 3:48 PM MDT, 53 minutes before

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Special weather statement, Jul 26, 3:55 PM MDT, 46 minutes before

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Special weather statement, Jul 26, 4:00 PM MDT, 41 minutes before

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Special weather statement, Jul 26, 4:13 PM MDT, 28 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 12:26 PM MDT	Special Weather Statement	RIW	Sublette	34 min
Jul 26, 12:37 PM MDT	Special Weather Statement	RIW	Sublette	23 min
Jul 26, 1:06 PM MDT	Special Weather Statement	RIW	Sublette	24 min
Jul 26, 1:29 PM MDT	Special Weather Statement	RIW	Sweetwater	31 min
Jul 26, 1:59 PM MDT	Special Weather Statement	RIW	Fremont	31 min
Jul 26, 2:26 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	34 min
Jul 26, 2:36 PM MDT	Special Weather Statement	RIW		24 min
Jul 26, 2:41 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	49 min
Jul 26, 3:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Fremont, Hot Springs, Natrona, Washakie	48 min
Jul 26, 3:13 PM MDT	Special Weather Statement	RIW	Sweetwater	47 min
Jul 26, 3:19 PM MDT	Special Weather Statement	RIW	Hot Springs	26 min
Jul 26, 3:42 PM MDT	Special Weather Statement	RIW		33 min
Jul 26, 3:48 PM MDT	Special Weather Statement	RIW	Washakie	27 min
Jul 26, 3:55 PM MDT	Special Weather Statement	RIW		35 min
Jul 26, 4:00 PM MDT	Special Weather Statement	RIW	Natrona	30 min
Jul 26, 4:13 PM MDT	Special Weather Statement	RIW	Natrona	47 min
Jul 26, 4:45 PM MDT	Special Weather Statement	RIW	Natrona	30 min
Jul 26, 5:17 PM MDT	Special Weather Statement	RIW	Natrona	28 min
Jul 26, 5:36 PM MDT	Special Weather Statement	RIW	Johnson	39 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2023 Every 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.