423
WWUS45 KRIW 231921
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
121 PM MDT THU APR 23 2026
WYZ001-240500-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF OLD FAITHFUL, MAMMOTH, AND LAKE
121 PM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 4 INCHES WITH
UP TO 1 INCH OF ADDITIONAL SNOW ACCUMULATION NEAR MAMMOTH AND THE
WEST ENTRANCE. WINDS GUSTING BETWEEN 20 AND 35 MPH.
* WHERE...YELLOWSTONE NATIONAL PARK.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* 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 CURRENT ROAD CONDITIONS ACROSS YELLOWSTONE NATIONAL PARK, VISIT
HTTPS://NPS.GOV/YELLOWSTONE.
WYZ002-240500-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
ABSAROKA MOUNTAINS-
121 PM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 1 AND 4 INCHES.
WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...ABSAROKA MOUNTAINS.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, ESPECIALLY IN THE
BACKCOUNTRY.
* ADDITIONAL DETAILS...ADDITIONAL SNOW ACCUMULATIONS UP TO 2 INCHES
POSSIBLE ALONG US 14/60/20 WEST OF CODY.
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.
WYZ008-009-240500-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
121 PM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY OVER POWDER RIVER
PASS.
* ADDITIONAL DETAILS...PERIODIC SNOW SHOWERS WILL BE POSSIBLE
THROUGH THE MORNING HOURS FRIDAY INTO THE EARLY AFTERNOON.
ADDITIONAL SNOW ACCUMULATION AS A RESULT OF THESE SHOWERS ARE
EXPECTED TO RANGE FROM 1 TO 3 INCHES MAINLY IN THE HIGHEST
ELEVATIONS.
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.
WYZ012-240500-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
TETON AND GROS VENTRE MOUNTAINS-
121 PM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 2 AND 6 INCHES
WITH LESSER AMOUNTS OF 1 TO 3 INCHES BELOW 9000 FEET. WINDS
GUSTING AS HIGH AS 40 MPH.
* WHERE...TETON AND GROS VENTRE MOUNTAINS.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, INCLUDING OVER TETON
PASS AND TOGWOTEE PASS.
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.
WYZ024-240500-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
SALT RIVER AND WYOMING RANGES-
121 PM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO 3 INCHES. WINDS
GUSTING AS HIGH AS 45 MPH.
* WHERE...SALT RIVER AND WYOMING RANGES.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT, INCLUDING OVER SALT RIVER
PASS.
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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