215
WWUS45 KRIW 201917
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1217 PM MST SAT DEC 20 2025
WYZ001-002-211215-
/O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-
INCLUDING THE CITIES OF MAMMOTH, OLD FAITHFUL, AND LAKE
1217 PM MST SAT DEC 20 2025
...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
MST MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 10 TO 20
INCHES. WINDS GUSTING AS HIGH AS 55 MPH.
* WHERE...ABSAROKA MOUNTAINS AND YELLOWSTONE NATIONAL PARK.
* WHEN...FROM 11 PM THIS EVENING TO 5 AM MST MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT.
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 .
WYZ012-211215-
/O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/
TETON AND GROS VENTRE MOUNTAINS-
1217 PM MST SAT DEC 20 2025
...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
MST MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 18
AND 30 INCHES. WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...TETON AND GROS VENTRE MOUNTAINS.
* WHEN...FROM 11 PM THIS EVENING TO 5 AM MST MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, ESPECIALLY ACROSS TETON
AND TOGWOTEE PASSES.
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 .
WYZ014-015-211215-
/O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
1217 PM MST SAT DEC 20 2025
...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
MST MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 12 TO 24
INCHES. WINDS GUSTING AS HIGH AS 70 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...FROM 11 PM THIS EVENING TO 5 AM MST MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. HAZARDOUS CONDITIONS
COULD IMPACT TRAVEL ALONG SOUTH PASS.
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 .
WYZ024-211215-
/O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/
SALT RIVER AND WYOMING RANGES-
1217 PM MST SAT DEC 20 2025
...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
MST MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 12 TO 18
INCHES. WINDS GUSTING AS HIGH AS 60 MPH.
* WHERE...SALT RIVER AND WYOMING RANGES.
* WHEN...FROM 11 PM THIS EVENING TO 5 AM MST MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, INCLUDING OVER SATL
RIVER PASS.
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 .
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE, VISIT
HTTPS://WEATHER.GOV/RIW/ .
STRAUB
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