Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 85, NWS Riverton, WY

July 29, 2025Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 29, 2025, 6:12 PM MDT for Fremont County, Wyoming. It was in force for 48 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, 6:12 PM MDT (00:12 UTC)
Expired: Jul 29, 2025, 7:00 PM MDT
In force: 48 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 00:11 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.

Issued	Product	Office	Lasted
Jul 29, 2:28 PM MDT	Severe Thunderstorm Watch	SPC	7 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, 5:37 PM MDT, 35 minutes earlier.

Area forecast discussion, Jul 29, 5:37 PM MDT, 35 minutes before

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Hazardous weather outlook, Jul 29, 4:29 AM MDT, 13 hours 43 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

Special weather statement, Jul 29, 5:10 PM MDT, 1 hour 2 minutes before

Special Weather Statement
National Weather Service Riverton WY
510 PM MDT Tue Jul 29 2025

WYZ005-007-292345-
Owl Creek and Bridger Mountains-Southwest Bighorn Basin-
510 PM MDT Tue Jul 29 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN HOT SPRINGS COUNTY
THROUGH 545 PM MDT...

At 509 PM MDT, the public reported a strong thunderstorm 11 miles
south of Hot Springs State Park, which is 11 miles south of
Thermopolis, moving southeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Public.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This storm will remain over mainly rural areas of southeastern Hot
Springs County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
central Wyoming.

&&

LAT...LON 4338 10797 4337 10799 4339 10804 4338 10804
      4342 10809 4342 10810 4340 10810 4340 10812
      4341 10812 4341 10816 4346 10817 4343 10819
      4347 10827 4360 10820 4355 10783
TIME...MOT...LOC 2309Z 298DEG 18KT 4349 10813

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Rowe

Special weather statement, Jul 29, 5:11 PM MDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Riverton WY
511 PM MDT Tue Jul 29 2025

WYZ020-292345-
Natrona County Lower Elevations-
511 PM MDT Tue Jul 29 2025

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL NATRONA COUNTY THROUGH
545 PM MDT...

At 510 PM MDT, Doppler radar was tracking a strong thunderstorm near
Goldeneye Reservoir, which is 27 miles northwest of Casper, moving
east at 20 mph.

HAZARD...Wind gusts up to 40 mph and penny sized hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This strong thunderstorm will be near...
  Goldeneye Reservoir around 515 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
central Wyoming.

&&

LAT...LON 4296 10688 4314 10689 4326 10649 4294 10649
TIME...MOT...LOC 2310Z 255DEG 17KT 4307 10677

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

CNJ

Special weather statement, Jul 29, 5:27 PM MDT, 45 minutes before

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Special weather statement, Jul 29, 5:47 PM MDT, 25 minutes before

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Local storm report, Jul 29, 5:55 PM MDT, 17 minutes before

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Local storm report, Jul 29, 6:00 PM MDT, 12 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 29, 6:16 PM MDT	Special Weather Statement	RIW		44 min
Jul 29, 6:38 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	15 min
Jul 29, 6:45 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	30 min
Jul 29, 7:10 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	35 min
Jul 29, 7:22 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	23 min
Jul 29, 7:42 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	11 min
Jul 30, 4:02 AM MDT	Special Weather Statement	RIW	Hot Springs	28 min
Jul 30, 4:31 AM MDT	Special Weather Statement	RIW	Washakie	29 min
Jul 30, 4:57 AM MDT	Special Weather Statement	RIW	Big Horn	33 min
Jul 30, 2:49 PM MDT	Special Weather Statement	RIW	Park	26 min
Jul 30, 3:11 PM MDT	Special Weather Statement	RIW	Hot Springs	49 min
Jul 30, 3:44 PM MDT	Special Weather Statement	RIW	Hot Springs	31 min
Jul 30, 3:53 PM MDT	Special Weather Statement	RIW	Park	37 min
Jul 30, 4:05 PM MDT	Special Weather Statement	RIW	Hot Springs	25 min
Jul 30, 4:10 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs	35 min
Jul 30, 4:21 PM MDT	Special Weather Statement	RIW	Hot Springs	24 min
Jul 30, 4:30 PM MDT	Special Weather Statement	RIW	Park	30 min
Jul 30, 4:37 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs	23 min
Jul 30, 4:43 PM MDT	Special Weather Statement	RIW	Teton	32 min
Jul 30, 4:45 PM MDT	Special Weather Statement	RIW	Hot Springs	30 min
Jul 30, 4:51 PM MDT	Special Weather Statement	RIW	Park	24 min
Jul 30, 4:54 PM MDT	Special Weather Statement	RIW	Washakie	36 min
Jul 30, 4:56 PM MDT	Special Weather Statement	RIW	Uinta	34 min
Jul 30, 5:23 PM MDT	Special Weather Statement	RIW	Washakie	37 min
Jul 30, 5:38 PM MDT	Special Weather Statement	RIW		37 min
Jul 30, 5:39 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Washakie	36 min
Jul 30, 5:40 PM MDT	Special Weather Statement	RIW	Natrona	35 min
Jul 30, 5:50 PM MDT	Special Weather Statement	RIW	Big Horn	55 min
Jul 30, 5:53 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	52 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2025 Every 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.