737
WWUS45 KRIW 230709
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
109 AM MDT THU APR 23 2026
WYZ008-009-240000-
/O.EXA.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
109 AM MDT THU APR 23 2026
..WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 PM MDT THIS EVENING
* WHAT...SNOW. SNOW ACCUMULATIONS OF 5 TO 12 INCHES, MAINLY FOR
ELEVATIONS 7,500 FEET AND ABOVE. NORTHWEST WINDS GUSTING BETWEEN
35 AND 50 MPH.
* 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...SNOW ACCUMULATIONS OF 6 TO 9 INCHES OVER
POWDER 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 .
WYZ001-240000-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF OLD FAITHFUL, MAMMOTH, AND LAKE
109 AM 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, WITH
UP TO 12 INCHES ACROSS HIGHER ELEVATIONS OF THE PITCHSTONE PLATEAU
IN SOUTHWEST YELLOWSTONE. ADDITIONAL ACCUMULATIONS OF 0.5 TO 2
INCHES 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.
* ADDITIONAL DETAILS...UP TO 4 INCHES POSSIBLE FROM OLD FAITHFUL TO
CANYON.
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 .
WYZ002-240000-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
ABSAROKA MOUNTAINS-
109 AM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 4 AND 10 INCHES
FOR ELEVATIONS 8,500 FEET AND ABOVE. WINDS GUSTING BETWEEN 35 AND
55 MPH WITH OCCASIONAL GUSTS AS HIGH AS 65 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 .
WYZ012-240000-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
TETON AND GROS VENTRE MOUNTAINS-
109 AM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 5 TO 11 INCHES FOR
ELEVATIONS 7,500 FEET AND ABOVE. ADDITIONAL ACCUMULATIONS OF 14 TO
18 INCHES ACROSS THE HIGHEST ELEVATIONS OF THE TETON MOUNTAINS.
WINDS GUSTING BETWEEN 25 AND 40 MPH, WITH GUSTS AS HIGH AS 50 MPH
ACROSS THE HIGHEST TERRAIN.
* 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.
* ADDITIONAL DETAILS...ADDITIONAL SNOW ACCUMULATIONS OF 0.5 TO 2
INCHES ARE POSSIBLE FOR ELEVATIONS BELOW 7,500 FEET.
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 .
WYZ024-240000-
/O.CON.KRIW.WW.Y.0016.000000T0000Z-260424T0500Z/
SALT RIVER AND WYOMING RANGES-
109 AM MDT THU APR 23 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 5 AND 10 INCHES
FOR ELEVATIONS 8,000 FEET AND ABOVE. THE HIGHEST ELEVATIONS OF THE
SALT RIVER RANGE COULD SEE AN ADDITIONAL 15 INCHES. WINDS GUSTING
BETWEEN 30 AND 45 MPH, WITH OCCASIONAL GUSTS AS HIGH AS 50 MPH.
* WHERE...SALT RIVER AND WYOMING RANGES.
* WHEN...UNTIL 11 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT, INCLUDING OVER SALT RIVER
PASS.
* ADDITIONAL DETAILS...ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 3
INCHES ACROSS 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/ .
GERHARDT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page