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
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page