043
WWUS45 KRIW 181158
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
458 AM MST WED FEB 18 2026
WYZ001-190000-
/O.CON.KRIW.WW.Y.0008.000000T0000Z-260219T0600Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF OLD FAITHFUL, LAKE, AND MAMMOTH
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MST THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 3 AND 5 INCHES
WITH UP TO 8 ADDITIONAL INCHES IN SOUTHWESTERN YELLOWSTONE.
* WHERE...YELLOWSTONE NATIONAL PARK.
* WHEN...UNTIL 11 PM MST THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE WEDNESDAY MORNING AND EVENING COMMUTES.
* ADDITIONAL DETAILS...TOTAL ACCUMULATIONS AROUND 3 INCHES NEAR
MAMMOTH.
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 .
WYZ012-014-015-024-190000-
/O.CON.KRIW.WW.Y.0008.000000T0000Z-260219T0600Z/
TETON AND GROS VENTRE MOUNTAINS-WIND RIVER MOUNTAINS WEST-WIND
RIVER MOUNTAINS EAST-SALT RIVER AND WYOMING RANGES-
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MST THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 5 AND 9 INCHES.
WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST, WIND RIVER MOUNTAINS WEST,
TETON AND GROS VENTRE MOUNTAINS, AND SALT RIVER AND WYOMING RANGES.
* WHEN...UNTIL 11 PM MST THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE WEDNESDAY MORNING AND EVENING COMMUTES.
* ADDITIONAL DETAILS...TOTAL SNOW ACCUMULATIONS 6 TO 10 INCHES FOR
TETON, TOGWOTEE, AND SOUTH 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 .
WYZ013-023-190000-
/O.CON.KRIW.WW.Y.0008.000000T0000Z-260219T0000Z/
JACKSON HOLE-STAR VALLEY-
INCLUDING THE CITIES OF THAYNE, STAR VALLEY RANCH, AFTON,
JACKSON, AND ALPINE
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 2 AND 4 INCHES.
* WHERE...JACKSON HOLE AND STAR VALLEY.
* WHEN...UNTIL 5 PM MST THIS AFTERNOON.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY MORNING AND EVENING COMMUTES.
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 .
WYZ005>007-190000-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
SOUTHWEST BIGHORN BASIN-SOUTHEAST BIGHORN BASIN-OWL CREEK AND
BRIDGER MOUNTAINS-
INCLUDING THE CITIES OF TEN SLEEP, WORLAND, AND THERMOPOLIS
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 4
INCHES, WITH LOCALLY HIGHER AMOUNTS SOUTH AND EAST OF A WORLAND TO
THERMOPOLIS LINE. WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...OWL CREEK AND BRIDGER MOUNTAINS, SOUTHWEST BIGHORN BASIN,
AND SOUTHEAST BIGHORN BASIN.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
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 .
WYZ008-009-190000-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 4
INCHES. WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY. THE
STEADIEST SNOW WILL FALL WEDNESDAY NIGHT.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
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 .
WYZ010-011-190000-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF KAYCEE AND BUFFALO
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 4
INCHES. WINDS GUSTING AS HIGH AS 40 MPH.
* WHERE...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY. THE
STEADIEST SNOW WILL FALL WEDNESDAY NIGHT.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
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 .
WYZ017-018-190000-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF LANDER, RIVERTON, AND SHOSHONI
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 5
INCHES. WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...LANDER FOOTHILLS AND WIND RIVER BASIN.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY. THE
STEADIEST SNOW WILL FALL WEDNESDAY NIGHT.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
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 .
WYZ019-020-022-190000-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-NATRONA COUNTY LOWER
ELEVATIONS-CASPER MOUNTAIN-
INCLUDING THE CITIES OF CASPER AND JEFFREY CITY
458 AM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 5
INCHES, EXCEPT 5 TO 8 INCHES ON CASPER MOUNTAIN. WINDS GUSTING AS
HIGH AS 35 MPH.
* WHERE...CASPER MOUNTAIN, GREEN MOUNTAINS AND RATTLESNAKE RANGE,
AND NATRONA COUNTY LOWER ELEVATIONS.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY. THE
STEADIEST SNOW WILL FALL WEDNESDAY NIGHT.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
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/ .
HATTINGS
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