936
WWUS45 KRIW 061155
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
455 AM MST Tue Jan 6 2026

WYZ001-070000-
/O.CON.KRIW.WW.Y.0003.000000T0000Z-260108T0000Z/
Yellowstone National Park-
Including the cities of Lake, Old Faithful, and Mammoth
455 AM MST Tue Jan 6 2026

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 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...Until 5 PM MST Wednesday.

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

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 .

&&

$$

WYZ012-070000-
/O.CON.KRIW.WW.Y.0003.000000T0000Z-260108T0000Z/
Teton and Gros Ventre Mountains-
455 AM MST Tue Jan 6 2026

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 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...Until 5 PM MST Wednesday.

* IMPACTS...Travel could be very difficult at times, including over
  Teton and Togwotee Passes.

* ADDITIONAL DETAILS...Snowfall rates will vary through Wednesday.
  Snow will be lighter today before picking back up late this
  evening.

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/ .

Myers