541
WWUS45 KRIW 200013
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
513 PM MST FRI DEC 19 2025
WYZ001-201200-
/O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF OLD FAITHFUL, LAKE, AND MAMMOTH
513 PM MST FRI DEC 19 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY
* WHAT...ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 4 INCHES. ADDITIONAL
SNOW AROUND MAMMOTH UP TO AN INCH. WINDS MAY GUST AS HIGH AS 55
MPH AT TIMES.
* WHERE...YELLOWSTONE NATIONAL PARK.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, ESPECIALLY IN THE
BACKCOUNTRY.
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 .
WYZ002-012-201200-
/O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/
ABSAROKA MOUNTAINS-TETON AND GROS VENTRE MOUNTAINS-
513 PM MST FRI DEC 19 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY
* WHAT...ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES ACROSS THE
ABSAROKAS AND 4 TO 8 INCHES ACROSS THE TETONS AND GROS VENTRES.
WINDS GUSTING AS HIGH AS 70 MPH.
* WHERE...ABSAROKA MOUNTAINS AND TETON AND GROS VENTRE MOUNTAINS.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. THE HAZARDOUS CONDITIONS
WILL IMPACT TRAVEL ACROSS TETON AND TOGWOTEE PASSES. BLOWING AND
DRIFTING OF SNOW IS EXPECTED.
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 .
WYZ014-015-201200-
/O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
513 PM MST FRI DEC 19 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY
* WHAT...ADDITIONAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES AND UP TO 12
INCHES ACROSS HIGHEST TERRAIN. 2 TO 5 INCHES OF ADDITIONAL SNOW IS
EXPECTED FOR SOUTH PASS AND UNION PASS. WINDS COULD GUST AS HIGH
AS 60 TO 70 MPH WITH LOCALLY STRONGER GUSTS POSSIBLE.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. BLOWING SNOW COULD
SIGNIFICANTLY REDUCE VISIBILITY. THE 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 .
WYZ024-201200-
/O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/
SALT RIVER AND WYOMING RANGES-
513 PM MST FRI DEC 19 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY
* WHAT...ADDITIONAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES. WINDS
GUSTING AS HIGH AS 70 MPH.
* WHERE...SALT RIVER AND WYOMING RANGES.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT INCLUDING OVER SALT RIVER
PASS. BLOWING SNOW COULD SIGNIFICANTLY REDUCE VISIBILITY.
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 .
WYZ013-023-201200-
/O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/
JACKSON HOLE-STAR VALLEY-
INCLUDING THE CITIES OF STAR VALLEY RANCH, THAYNE, ALPINE,
JACKSON, AND AFTON
513 PM MST FRI DEC 19 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...
* WHAT...ADDITIONAL SNOW ACCUMULATIONS AROUND AN INCH. WINDS GUSTING
AS HIGH AS 60 MPH.
* WHERE...JACKSON HOLE AND STAR VALLEY.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT.
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 .
WYZ025-201200-
/O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/
UPPER GREEN RIVER BASIN FOOTHILLS-
INCLUDING THE CITIES OF PINEDALE
513 PM MST FRI DEC 19 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...
* WHAT...ADDITIONAL SNOW ACCUMULATIONS UP TO 3 INCHES. WINDS GUSTING
AS HIGH AS 60 MPH.
* WHERE...UPPER GREEN RIVER BASIN FOOTHILLS.
* WHEN...UNTIL 5 AM MST SATURDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT.
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/ .
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