Severe Thunderstorm Warning 99, NWS Riverton, WY

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Hazardous Weather Outlook
National Weather Service Riverton WY
440 AM MDT Thu Jul 31 2025

WYZ001>020-022>030-011445-
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-
440 AM MDT Thu Jul 31 2025

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Showers and thunderstorms will develop during the afternoon and
evening today. The best chances are expected to be east of the Divide
especially in portions of Natorna and Johnson Counties. A few storms
may be strong to severe and be capable of producing large hail,
strong gusty winds, and heavy downpours. Localized flash flooding
cannot be ruled out especially in poor drainage areas. Low RH values
along with breezy winds may create elevated to near critical fire
weather conditions across southern WY.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday through Monday...Daily chances for afternoon showers and
thunderstorms. The best chances will remain over central and northern
WY with lesser chances elsewhere. Periodic heavy downpours will be
possible with any showers or thunderstorms that develop.
Precipitation chances will decrease through the weekend becoming more
focused across northern WY. Low min RH and breezy winds will develop
across southern WY. This may lead to elevated or near critical fire
weather conditions through the weekend.

.SPOTTER INFORMATION STATEMENT...

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

Special Weather Statement
National Weather Service Riverton WY
720 PM MDT Thu Jul 31 2025

WYZ007-017-010145-
Owl Creek and Bridger Mountains-Wind River Basin-
720 PM MDT Thu Jul 31 2025

...STRONG THUNDERSTORMS WILL IMPACT SOUTH CENTRAL HOT SPRINGS AND
EAST CENTRAL FREMONT COUNTIES THROUGH 745 PM MDT...

At 719 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms 10 miles northwest of Boysen State Park, which is 16
miles northwest of Shoshoni, moving north at 15 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.  Pea to half
         inch hail could also accumulate to 2 to 3 inches deep.

SOURCE...Radar indicated.

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 south central Hot
Springs and east central Fremont Counties, including the following
locations... Bonneville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Very heavy rainfall is also occurring with this storm and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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.

If on or near Boysen Reservoir, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4318 10802 4323 10851 4345 10877 4363 10865
      4344 10789
TIME...MOT...LOC 0119Z 186DEG 12KT 4337 10836

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

McDonald

Special Weather Statement
National Weather Service Riverton WY
721 PM MDT Thu Jul 31 2025

WYZ010-010215-
Northeast Johnson County-
721 PM MDT Thu Jul 31 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHERN JOHNSON COUNTY THROUGH
815 PM MDT...

At 720 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles east of Lake De Smet, which is 13 miles northeast of Buffalo.
This thunderstorm was nearly stationary.

HAZARD...Wind gusts up to 50 mph and penny size hail. Hail may
         accumulate.

SOURCE...Radar indicated.

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 northern Johnson
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4437 10638 4438 10659 4456 10665 4456 10627
TIME...MOT...LOC 0120Z 189DEG 3KT 4446 10649

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Rowe

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