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