Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 46, NWS Riverton, WY

July 4, 2025Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 4, 2025, 5:45 PM MDT for Natrona County, Wyoming. It was in force for 15 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 4, 2025, 5:45 PM MDT (23:45 UTC)
Expired
Jul 4, 2025, 6:00 PM MDT
In force
15 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 23:48 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.

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 4, 5:31 PM MDT, 14 minutes earlier.

Area forecast discussion, Jul 4, 5:31 PM MDT, 14 minutes before
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Hazardous weather outlook, Jul 4, 2:40 AM MDT, 15 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
240 AM MDT Fri Jul 4 2025

WYZ001>020-022>030-051245-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn 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-
240 AM MDT Fri Jul 4 2025

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Multiple rounds of showers and thunderstorms will move through the
state today. The first round is expected to begin developing by the
late morning with the next following shortly behind during the early
afternoon. A later round develops by the late afternoon lingering
into the late evening hours. A few isolated strong to severe storms
cannot be ruled out. These stronger storms may be capable of
producing small hail, heavy downpours, and strong gusty winds.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...Thunderstorms develop once again in the afternoon with
coverage being more limited in nature. Convection chances look to
remain mainly across central and northern WY. Some strong to severe
storms will be possible, especially across the eastern Bighorn Basin
into Johnson and Natrona Counties. These strong to severe storms will
be capable of producing large hail, strong gusty winds, and an
isolated tornado or two.

Sunday through Thursday...Drier and warmer weather is expected to
develop and prevail across the region. This will likely lead to
increased chances for elevated fire weather conditions for much of
the state.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Local storm report, Jul 4, 5:15 PM MDT, 30 minutes before
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Local storm report, Jul 4, 5:16 PM MDT, 29 minutes before
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Local storm report, Jul 4, 5:19 PM MDT, 26 minutes before
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Special weather statement, Jul 4, 5:20 PM MDT, 25 minutes before
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Local storm report, Jul 4, 5:23 PM MDT, 22 minutes before
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Local storm report, Jul 4, 5:45 PM MDT, 0 minutes before
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      </p>
      <p id="message2">
        Please try again in a few minutes.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 12:17 PM MDTSpecial Weather StatementRIWLincoln28 min
Jul 4, 12:44 PM MDTSpecial Weather StatementRIWLincoln31 min
Jul 4, 1:13 PM MDTSpecial Weather StatementRIWSublette32 min
Jul 4, 1:46 PM MDTSpecial Weather StatementRIWSublette29 min
Jul 4, 2:12 PM MDTSpecial Weather StatementRIW63 min
Jul 4, 3:18 PM MDTSpecial Weather StatementRIWFremont57 min
Jul 4, 3:29 PM MDTSevere Thunderstorm WarningRIWFremont31 min
Jul 4, 3:58 PM MDTSpecial Weather StatementRIWSweetwater32 min
Jul 4, 3:58 PM MDTSevere Thunderstorm WarningRIWFremont47 min
Jul 4, 4:18 PM MDTSpecial Weather StatementRIW42 min
Jul 4, 4:29 PM MDTSevere Thunderstorm WarningRIWBig Horn31 min
Jul 4, 4:32 PM MDTSevere Thunderstorm WarningRIWFremont, Natrona28 min
Jul 4, 4:34 PM MDTSpecial Weather StatementRIWWashakie26 min
Jul 4, 4:54 PM MDTSevere Thunderstorm Warning Considerable damage threatRIWNatrona51 min
Jul 4, 4:57 PM MDTSpecial Weather StatementRIWWashakie33 min
Jul 4, 5:20 PM MDTSpecial Weather StatementRIWJohnson25 min
Jul 4, 5:46 PM MDTSpecial Weather StatementRIWJohnson29 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; radar from the NEXRAD Level II archive.