766
WWUS45 KRIW 091559
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
859 AM MST Tue Dec 9 2025

WYZ001-002-100200-
/O.CON.KRIW.WS.W.0013.000000T0000Z-251211T0000Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Mammoth, Lake, and Old Faithful
859 AM MST Tue Dec 9 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY...

* WHAT...Heavy snow. Additional snow accumulations between 10 and 20
  inches, with the highest amounts in the western Absarokas and
  southwestern Yellowstone Park. Northern Yellowstone Park will see
  4 to 8 inches of snow with much lower amounts, less than 2 inches
  at Mammoth. Winds gusting as high as 60 to 70 mph across the
  ridgetops.

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

* WHEN...Until 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 .

&&

$$

WYZ012-100200-
/O.CON.KRIW.WS.W.0013.000000T0000Z-251211T0000Z/
Teton and Gros Ventre Mountains-
859 AM MST Tue Dec 9 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST WEDNESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 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...Until 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 .

&&

$$

WYZ008-100200-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Bighorn Mountains West-
859 AM MST Tue Dec 9 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
WEDNESDAY...

* WHAT...Snow. Additional 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...Until 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 .

&&

$$

WYZ014-015-100200-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Wind River Mountains West-Wind River Mountains East-
859 AM MST Tue Dec 9 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
WEDNESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 8 to 16 inches
  possible. Less than 1 inch 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...Until 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 .

&&

$$

WYZ024-100200-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Salt River and Wyoming Ranges-
859 AM MST Tue Dec 9 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
WEDNESDAY...

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

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 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 .

&&

$$

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

Dziewaltowski