561
WWUS45 KRIW 131923
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
123 PM MDT FRI MAR 13 2026
WYZ001-141300-
/O.UPG.KRIW.WS.A.0003.260314T1200Z-260315T0500Z/
/O.NEW.KRIW.WW.Y.0013.260314T1200Z-260315T0500Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF LAKE, OLD FAITHFUL, AND MAMMOTH
123 PM MDT FRI MAR 13 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM TO 11 PM MDT
SATURDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF AN INCH OR TWO
AT MAMMOTH AND THE LAMAR VALLEY, 4 TO 8 INCHES THROUGHOUT THE
PARK, AND 10 TO 15 INCHES OVER THE PITCHSTONE PLATEAU AND HIGH
PEAKS. WINDS GUSTING 35 TO 50 MPH.
* WHERE...YELLOWSTONE NATIONAL PARK.
* WHEN...FROM 6 AM TO 11 PM MDT SATURDAY.
* IMPACTS...EXPECT WINTRY TRAVEL AND BACKCOUNTRY CONDITIONS.
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 .
WYZ002-012-141300-
/O.UPG.KRIW.WS.A.0003.260314T1200Z-260315T0500Z/
/O.NEW.KRIW.WW.Y.0013.260314T1200Z-260315T0500Z/
ABSAROKA MOUNTAINS-TETON AND GROS VENTRE MOUNTAINS-
123 PM MDT FRI MAR 13 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM TO 11 PM MDT
SATURDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 2 TO 4 INCHES
OVER CHIEF JOSEPH PASS, BETWEEN 4 AND 8 INCHES OVER TETON AND
TOGWOTEE PASSES, AND 10 TO 15 INCHES OVER THE HIGHEST PEAKS. WINDS
GUSTING 45 TO 60 MPH.
* WHERE...ABSAROKA MOUNTAINS AND TETON AND GROS VENTRE MOUNTAINS.
* WHEN...FROM 6 AM TO 11 PM MDT SATURDAY.
* IMPACTS...EXPECT WINTRY TRAVEL CONDITIONS OVER MOUNTAIN PASSES,
INCLUDING TETON, TOGWOTEE, AND CHIEF JOSEPH PASSES.
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 .
WYZ008-009-141300-
/O.UPG.KRIW.WS.A.0003.260314T1200Z-260315T1200Z/
/O.NEW.KRIW.WW.Y.0013.260314T1200Z-260315T0500Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
123 PM MDT FRI MAR 13 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM TO 11 PM MDT
SATURDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 5 TO 10 INCHES
OVER POWDER RIVER AND GRANITE PASSES, AND UP TO 12 INCHES OVER THE
HIGHEST TERRAIN. WINDS GUSTING 45 TO 60 MPH.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...FROM 6 AM TO 11 PM MDT SATURDAY.
* IMPACTS...EXPECT WINTRY TRAVEL CONDITIONS OVER MOUNTAIN PASSES,
INCLUDING GRANITE AND POWDER RIVER PASSES.
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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