Hazardous Weather Outlook
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
808 FLUS45 KRIW 311040 HWORIW 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. $$