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Home Return to list Freeze Warning 0004 Issued by the Riverton Forecast Office
Action: New Issued At: 2026-05-19 10:35:49 864 WWUS75 KRIW 191535 NPWRIW URGENT - WEATHER MESSAGE National Weather Service Riverton WY 935 AM MDT Tue May 19 2026 WYZ005-006-201400- /O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/ Southwest Bighorn Basin-Southeast Bighorn Basin- Including the cities of Ten Sleep, Thermopolis, and Worland 935 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Southwest Bighorn Basin and Southeast Bighorn Basin. * WHEN...From 9 PM this evening to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ011-016>020-201400- /O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/ Southeast Johnson County-Upper Wind River Basin-Wind River Basin- Lander Foothills-Green Mountains and Rattlesnake Range-Natrona County Lower Elevations- Including the cities of Shoshoni, Riverton, Lander, Jeffrey City, Dubois, Kaycee, and Casper 935 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 25 and 30 degrees expected. The coldest temperatures occur where recent snowfall has occurred, where lows may reach as cold as 20 degrees. * WHERE...Green Mountains and Rattlesnake Range, Lander Foothills, Natrona County Lower Elevations, Upper Wind River Basin, Wind River Basin, and Southeast Johnson County. * WHEN...From 9 PM this evening to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann Action: New Issued At: 2026-05-19 10:35:49 864 WWUS75 KRIW 191535 NPWRIW URGENT - WEATHER MESSAGE National Weather Service Riverton WY 935 AM MDT Tue May 19 2026 WYZ005-006-201400- /O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/ Southwest Bighorn Basin-Southeast Bighorn Basin- Including the cities of Ten Sleep, Thermopolis, and Worland 935 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Southwest Bighorn Basin and Southeast Bighorn Basin. * WHEN...From 9 PM this evening to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ011-016>020-201400- /O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/ Southeast Johnson County-Upper Wind River Basin-Wind River Basin- Lander Foothills-Green Mountains and Rattlesnake Range-Natrona County Lower Elevations- Including the cities of Shoshoni, Riverton, Lander, Jeffrey City, Dubois, Kaycee, and Casper 935 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 25 and 30 degrees expected. The coldest temperatures occur where recent snowfall has occurred, where lows may reach as cold as 20 degrees. * WHERE...Green Mountains and Rattlesnake Range, Lander Foothills, Natrona County Lower Elevations, Upper Wind River Basin, Wind River Basin, and Southeast Johnson County. * WHEN...From 9 PM this evening to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann Action: Expired Issued At: 2026-05-20 08:49:15 787 WWUS75 KRIW 201348 NPWRIW URGENT - WEATHER MESSAGE National Weather Service Riverton WY 748 AM MDT Wed May 20 2026 WYZ005-006-011-016>020-201500- /O.EXP.KRIW.FZ.W.0004.000000T0000Z-260520T1400Z/ Southwest Bighorn Basin-Southeast Bighorn Basin-Southeast Johnson County-Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range-Natrona County Lower Elevations- Including the cities of Ten Sleep, Casper, Shoshoni, Kaycee, Lander, Riverton, Worland, Jeffrey City, Thermopolis, and Dubois 748 AM MDT Wed May 20 2026 ...FREEZE WARNING WILL EXPIRE AT 8 AM MDT THIS MORNING... Temperatures will continue to warm through the morning. Therefore, the Freeze Warning will be allowed to expire at 8 AM MDT. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . 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