Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 89, NWS Riverton, WY

July 29, 2025Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 29, 2025, 7:22 PM MDT for Natrona County, Wyoming. It was in force for 23 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 29, 2025, 7:22 PM MDT (01:22 UTC)
Expired
Jul 29, 2025, 7:45 PM MDT
In force
23 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 01:25 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.

IssuedProductOfficeLasted
Jul 29, 2:28 PM MDTSevere Thunderstorm WatchSPC7 hr

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 29, 7:20 PM MDT, 2 minutes earlier.

Area forecast discussion, Jul 29, 7:20 PM MDT, 2 minutes before
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Hazardous weather outlook, Jul 29, 4:29 AM MDT, 14 hours 53 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
429 AM MDT Tue Jul 29 2025

WYZ001>020-022>030-301430-
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-
429 AM MDT Tue Jul 29 2025

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Showers and thunderstorms are expected to start developing late this
morning across western WY. By the afternoon these showers and
thunderstorms will spread east of the Divide. The favorable
environment east of the Divide will support the potential for strong
to severe thunderstorms to develop. The main hazards as a result of
any strong to severe storms will be large hail, strong gusty winds,
and heavy downpours. Showers and storms will gradually dissipate by
the late evening hours.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday through Saturday...Daily chances for afternoon showers and
thunderstorms. The best chances will remain east of the Divide with
lesser chances elsewhere. Periodic heavy downpours will be possible
with any showers or thunderstorms that develop.

.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 29, 5:55 PM MDT, 1 hour 27 minutes before
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Local storm report, Jul 29, 6:00 PM MDT, 1 hour 22 minutes before
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Special weather statement, Jul 29, 6:16 PM MDT, 1 hour 6 minutes before
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      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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Local storm report, Jul 29, 6:23 PM MDT, 59 minutes before
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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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Local storm report, Jul 29, 6:55 PM MDT, 27 minutes before
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      <p id="message1">
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      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Jul 29, 6:56 PM MDT, 26 minutes before
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<body>
  <main class="wrap">
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 6:12 PM MDTSevere Thunderstorm WarningRIWFremont48 min
Jul 29, 6:16 PM MDTSpecial Weather StatementRIW44 min
Jul 29, 6:38 PM MDTSevere Thunderstorm WarningRIWNatrona15 min
Jul 29, 6:45 PM MDTSevere Thunderstorm WarningRIWJohnson30 min
Jul 29, 7:10 PM MDTSevere Thunderstorm WarningRIWJohnson35 min
Jul 29, 7:42 PM MDTSevere Thunderstorm WarningRIWNatrona11 min
Jul 30, 4:02 AM MDTSpecial Weather StatementRIWHot Springs28 min
Jul 30, 4:31 AM MDTSpecial Weather StatementRIWWashakie29 min
Jul 30, 4:57 AM MDTSpecial Weather StatementRIWBig Horn33 min
Jul 30, 2:49 PM MDTSpecial Weather StatementRIWPark26 min
Jul 30, 3:11 PM MDTSpecial Weather StatementRIWHot Springs49 min
Jul 30, 3:44 PM MDTSpecial Weather StatementRIWHot Springs31 min
Jul 30, 3:53 PM MDTSpecial Weather StatementRIWPark37 min
Jul 30, 4:05 PM MDTSpecial Weather StatementRIWHot Springs25 min
Jul 30, 4:10 PM MDTSevere Thunderstorm WarningRIWHot Springs35 min
Jul 30, 4:21 PM MDTSpecial Weather StatementRIWHot Springs24 min
Jul 30, 4:30 PM MDTSpecial Weather StatementRIWPark30 min
Jul 30, 4:37 PM MDTSevere Thunderstorm WarningRIWHot Springs23 min
Jul 30, 4:43 PM MDTSpecial Weather StatementRIWTeton32 min
Jul 30, 4:45 PM MDTSpecial Weather StatementRIWHot Springs30 min
Jul 30, 4:51 PM MDTSpecial Weather StatementRIWPark24 min
Jul 30, 4:54 PM MDTSpecial Weather StatementRIWWashakie36 min
Jul 30, 4:56 PM MDTSpecial Weather StatementRIWUinta34 min
Jul 30, 5:23 PM MDTSpecial Weather StatementRIWWashakie37 min
Jul 30, 5:38 PM MDTSpecial Weather StatementRIW37 min
Jul 30, 5:39 PM MDTSevere Thunderstorm WarningRIWBig Horn, Washakie36 min
Jul 30, 5:40 PM MDTSpecial Weather StatementRIWNatrona35 min
Jul 30, 5:50 PM MDTSpecial Weather StatementRIWBig Horn55 min
Jul 30, 5:53 PM MDTSevere Thunderstorm WarningRIWNatrona52 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.