418
WWUS45 KRIW 052047
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
147 PM MST Mon Jan 5 2026

WYZ001-061430-
/O.NEW.KRIW.WW.Y.0003.260106T0600Z-260108T0000Z/
Yellowstone National Park-
Including the cities of Lake, Old Faithful, and Mammoth
147 PM MST Mon Jan 5 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 5 PM
MST WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches
  with amounts of 1 to 2 inches nearby Mammoth. Locally higher
  amounts of 10 to 16 inches near the South Entrance and up to 2
  feet in southwestern portions of the park. Winds may gust as high
  as 50 mph at times.

* WHERE...Yellowstone National Park.

* WHEN...From 11 PM this evening to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult especially in the
  backcountry.

* ADDITIONAL DETAILS...Light to moderate snowfall will occur over a
  period of nearly 48 hours. There will be heavier periods of
  snowfall, likely Tuesday morning and once again Wednesday morning.

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.

&&

$$

WYZ012-061430-
/O.NEW.KRIW.WW.Y.0003.260106T0600Z-260108T0000Z/
Teton and Gros Ventre Mountains-
147 PM MST Mon Jan 5 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 5 PM
MST WEDNESDAY...

* WHAT...Snow expected. Total snow accumulations of 6 to 12 inches.
  Locally higher amounts of 12 to 18 inches in the higher elevations
  with amounts nearing 2 feet in the Tetons. Winds may gust as high
  as 45 mph at times.

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...From 11 PM this evening to 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult at times. The hazardous
  conditions could impact commutes over Teton and Togwotee Passes.

* ADDITIONAL DETAILS...Light to moderate snowfall will occur over a
  period of nearly 48 hours. There will be heavier periods of
  snowfall, likely Tuesday morning and once again Wednesday morning.

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