021
WWUS75 KRIW 041838
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
1238 PM MDT Sat Oct 4 2025

WYZ013-016-023-027-051600-
/O.NEW.KRIW.FZ.W.0005.251005T0700Z-251005T1600Z/
Jackson Hole-Upper Wind River Basin-Star Valley-South Lincoln
County-
Including the cities of Alpine, Kemmerer, Jackson, Dubois, Star
Valley Ranch, Afton, Thayne, and Cokeville
1238 PM MDT Sat Oct 4 2025

...FREEZE WARNING IN EFFECT FROM 1 AM TO 10 AM MDT SUNDAY...

* WHAT...Sub-freezing temperatures as low as 28 expected. Isolated
  areas as low as 25 degrees possible for cold prone locations, such
  as along rivers and low-lying areas.

* WHERE...Upper Wind River Basin, Jackson Hole, South Lincoln
  County, and Star Valley.

* WHEN...From 1 AM to 10 AM MDT Sunday.

* 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.

&&

$$

WYZ003>006-010-011-017>020-028>030-051600-
/O.NEW.KRIW.FZ.A.0002.251006T0700Z-251006T1600Z/
Cody Foothills-North Bighorn Basin-Southwest Bighorn Basin-
Southeast Bighorn Basin-Northeast Johnson County-Southeast
Johnson County-Wind River Basin-Lander Foothills-Green Mountains
and Rattlesnake Range-Natrona County Lower Elevations-Rock
Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Meeteetse, Shoshoni, Basin, Thermopolis,
Riverton, Powell, Shell, Green River, Jeffrey City, Lander,
Lovell, Wamsutter, Buffalo, Greybull, Worland, Casper, Kaycee,
Clark, Cody, Rock Springs, and Ten Sleep
1238 PM MDT Sat Oct 4 2025

...FREEZE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
MORNING...

* WHAT...Sub-freezing temperatures as low as 30 possible.

* WHERE...Portions of central, north central, northwest, and south
  central Wyoming.

* WHEN...From late Sunday night through Monday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

* ADDITIONAL DETAILS...Cloud cover could keep temperatures warmer
  than currently forecasted. There is generally a 45 to 80 percent
  chance of low temperatures reaching 32 degrees or less.

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