093
WWUS45 KRIW 082021
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
121 PM MST Mon Dec 8 2025

WYZ012-091300-
/O.UPG.KRIW.WS.A.0010.251209T1200Z-251211T0000Z/
/O.EXB.KRIW.WS.W.0013.251209T1200Z-251211T0000Z/
Teton and Gros Ventre Mountains-
121 PM MST Mon Dec 8 2025

...WINTER STORM WARNING IN EFFECT FROM 5 AM TUESDAY TO 5 PM MST
WEDNESDAY...

* WHAT...Heavy snow expected. Total snow accumulations generally 1
  to 2 feet. Winds gusting as 50 to 60 mph, with strongest winds
  occurring Tuesday night through Wednesday morning.

* WHERE...Teton and Gros Ventre Mountains, including Teton Pass and
  Togwotee Pass.

* WHEN...From 5 AM Tuesday to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult. The hazardous conditions
  could impact travel across Teton and Togwotee Passes Tuesday and
  Wednesday. Blowing and drifting of snow is expected. Backcountry
  travel is not advised.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

WYZ001-002-091300-
/O.CON.KRIW.WS.W.0013.251209T0000Z-251211T0000Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Lake, Mammoth, and Old Faithful
121 PM MST Mon Dec 8 2025

...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON
TO 5 PM MST WEDNESDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 10
  and 20 inches, with the highest amounts in the western Absarokas
  and southwestern Yellowstone Park. Northern Yellowstone Park will
  see 6 to 10 inches of snow with much lower amounts, less than 3
  inches at Mammoth.  Winds gusting as high as 60 to 70 mph across
  the ridgetops.

* WHERE...Absaroka Mountains and Yellowstone National Park.

* WHEN...From 5 PM this afternoon to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult across Yellowstone Park
  and along Chief Joseph Highway. Significant blowing and drifting
  of snow is expected. Backcountry travel is not advised.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

WYZ014-015-091300-
/O.UPG.KRIW.WS.A.0010.251209T1200Z-251211T0000Z/
/O.NEW.KRIW.WW.Y.0036.251209T1200Z-251211T0000Z/
Wind River Mountains West-Wind River Mountains East-
121 PM MST Mon Dec 8 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TUESDAY TO 5 PM MST
WEDNESDAY...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 16
  inches possible. Less than 2 inches of snow is expected for South
  Pass. Winds could gust as high as 60 to 70 mph. Locally stronger
  gusts are possible.

* WHERE...Wind River Mountains.

* WHEN...From 5 AM Tuesday to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult. Backcountry travel is
  not advised.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

WYZ024-091300-
/O.UPG.KRIW.WS.A.0010.251209T1200Z-251211T0000Z/
/O.NEW.KRIW.WW.Y.0036.251209T1200Z-251211T0000Z/
Salt River and Wyoming Ranges-
121 PM MST Mon Dec 8 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TUESDAY TO 5 PM MST
WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations of 6 to 12 inches.
  Winds gusting as high as 60 mph.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...From 5 AM Tuesday to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult including over Salt River
  Pass. Backcountry travel is not advised.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

WYZ008-091300-
/O.NEW.KRIW.WW.Y.0036.251209T1200Z-251211T0000Z/
Bighorn Mountains West-
121 PM MST Mon Dec 8 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TUESDAY TO 5 PM MST
WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations up to 12 to 20
  inches across higher peaks in the northern part of the Range,
  including along Granite Pass. Around 6 to 12 inches across Powder
  River Pass. 1 to 3 inches of snow possible across the southern
  part of the Range. Winds gusting as high as 50 to 60 mph.

* WHERE...Bighorn Mountains West.

* WHEN...From 5 AM Tuesday to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult across Powder River and
  Granite Passes. Significant blowing and drifting of snow is
  possible. Backcountry travel is not advised.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

For more information from the National Weather Service, visit
https://weather.gov/riw/ .

Hensley