210
WWUS45 KRIW 151958
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1258 PM MST Mon Dec 15 2025

WYZ001-002-012-014-015-024-161100-
/O.NEW.KRIW.WS.A.0011.251217T0800Z-251218T0600Z/
Yellowstone National Park-Absaroka Mountains-Teton and Gros
Ventre Mountains-Wind River Mountains West-Wind River Mountains
East-Salt River and Wyoming Ranges-
Including the cities of Lake, Mammoth, and Old Faithful
1258 PM MST Mon Dec 15 2025

...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
WEDNESDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations 6 to 10
  inches above 8000 feet possible, with near 12 inches at the
  highest elevations. Widespread westerly winds gusting 40 to 60
  mph, with isolated stronger winds.

* WHERE...Portions of central, northwest, and west central Wyoming.

* WHEN...From late Tuesday night through Wednesday evening.

* IMPACTS...Travel will likely be very difficult, namely along
  mountain passes like Teton, Togwotee, and South Pass due to a
  combination of strong winds and falling snow reducing visibilities.

* ADDITIONAL DETAILS...Areas of winds near 75 mph possible,
  especially for eastern mountain slopes, like the eastern Absaroka
  and Wind River Mountains. The heaviest snow occurs between about 1
  AM and noon MST Wednesday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

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

Wittmann