145
WWUS45 KRIW 101037
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
337 AM MST Wed Dec 10 2025

WYZ001-002-110000-
/O.CON.KRIW.WS.W.0013.000000T0000Z-251211T0000Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Lake, Mammoth, and Old Faithful
337 AM MST Wed Dec 10 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Heavy snow. Additional snow accumulations up to 6 inches.
  Winds gusting as high as 65 mph.

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

* WHEN...Until 5 PM MST this afternoon.

* 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 .

&&

$$

WYZ012-110000-
/O.CON.KRIW.WS.W.0013.000000T0000Z-251211T0000Z/
Teton and Gros Ventre Mountains-
337 AM MST Wed Dec 10 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Heavy snow. Additional snow accumulations up to 6 inches.
  Winds gusting as high as 50 mph.

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...Until 5 PM MST this afternoon.

* 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 .

&&

$$

WYZ008-110000-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Bighorn Mountains West-
337 AM MST Wed Dec 10 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Snow. Additional snow accumulations up to 6 inches. Winds
  gusting as high as 50 mph.

* WHERE...Bighorn Mountains West.

* WHEN...Until 5 PM MST this afternoon.

* 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 .

&&

$$

WYZ014-015-110000-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Wind River Mountains West-Wind River Mountains East-
337 AM MST Wed Dec 10 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Snow. Additional snow accumulations up to 5 inches. Winds
  gusting as high as 70 mph.

* WHERE...Wind River Mountains.

* WHEN...Until 5 PM MST this afternoon.

* 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 .

&&

$$

WYZ024-110000-
/O.CON.KRIW.WW.Y.0036.000000T0000Z-251211T0000Z/
Salt River and Wyoming Ranges-
337 AM MST Wed Dec 10 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Wet snow. Additional snow accumulations up to 4 inches.
  Winds gusting as high as 60 mph.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 5 PM MST this afternoon.

* 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/ .

Straub