307
WWUS45 KRIW 181906
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1206 PM MST WED FEB 18 2026
WYZ011-020-191215-
/O.UPG.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
/O.NEW.KRIW.WS.W.0001.260219T0000Z-260219T1800Z/
SOUTHEAST JOHNSON COUNTY-NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER AND KAYCEE
1206 PM MST WED FEB 18 2026
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 11 AM
MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 6
INCHES AROUND CASPER. HIGHER AMOUNTS OF 4 TO 8 INCHES ARE EXPECTED
ACROSS NORTHERN NATRONA INTO SOUTHERN JOHNSON COUNTIES. WINDS
GUSTING AS HIGH AS 40 MPH.
* WHERE...NATRONA COUNTY LOWER ELEVATIONS AND SOUTHEAST JOHNSON
COUNTY.
* WHEN...FROM 5 PM THIS AFTERNOON TO 11 AM MST THURSDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING COMMUTES.
* ADDITIONAL DETAILS...THE HEAVIEST SNOWFALL IS FORECAST TO OCCUR
LATE WEDNESDAY EVENING INTO THE EARLY MORNING HOURS THURSDAY WITH
SNOWFALL RATES UP TO 1 INCH AN HOUR. WINDS WILL BE GUSTING UP TO
40 MPH DURING THIS TIME, WHICH MAY LEAD TO BLOWING SNOW AND
REDUCED VISIBILITIES.
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.
WYZ003-004-191215-
/O.EXA.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
CODY FOOTHILLS-NORTH BIGHORN BASIN-
INCLUDING THE CITIES OF CLARK, BASIN, SHELL, GREYBULL, MEETEETSE,
POWELL, CODY, AND LOVELL
1206 PM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST THURSDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 1 AND 4
INCHES. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...CODY FOOTHILLS AND NORTH 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.
* ADDITIONAL DETAILS...THE HEAVIEST SNOWFALL IS FORECAST TO OCCUR
LATE WEDNESDAY EVENING INTO THE EARLY MORNING HOURS THURSDAY.
WINDS WILL BE GUSTING UP TO 45 MPH DURING THIS TIME, WHICH MAY
LEAD TO BLOWING SNOW AND REDUCED VISIBILITIES.
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.
WYZ001-190600-
/O.CON.KRIW.WW.Y.0008.000000T0000Z-260219T0600Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF MAMMOTH, OLD FAITHFUL, AND LAKE
1206 PM 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...BACKCOUNTRY TRAVEL WILL BE DIFFICULT.
* 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.
WYZ012-014-015-024-190600-
/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-
1206 PM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MST THIS
EVENING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS BETWEEN 4 AND 10
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 JACKSON, ALPINE, THAYNE, STAR VALLEY
RANCH, AND AFTON
1206 PM MST WED FEB 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO TWO INCHES.
* WHERE...JACKSON HOLE AND STAR VALLEY.
* WHEN...UNTIL 5 PM MST THIS AFTERNOON.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE WEDNESDAY EVENING COMMUTE.
* ADDITIONAL DETAILS...WEDNESDAY AFTERNOON WEST TO SOUTHWEST WIND
GUSTS 20 TO 25 MPH.
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>007-191215-
/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, THERMOPOLIS, AND WORLAND
1206 PM 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 6
INCHES WITH LOCALLY HIGHER AMOUNTS SOUTH AND EAST OF THE WORLAND
TO THERMOPOLIS LINE. WINDS GUSTING AS HIGH AS 40 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. THE
STEADIEST SNOW WILL FALL WEDNESDAY NIGHT.
* IMPACTS...TRAVEL COULD BE DIFFICULT. 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.
WYZ008-009-191215-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1206 PM 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 7
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.
WYZ010-191215-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
NORTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF BUFFALO
1206 PM 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...NORTHEAST JOHNSON COUNTY.
* 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.
* ADDITIONAL DETAILS...THE HEAVIEST SNOWFALL IS FORECAST TO OCCUR
LATE WEDNESDAY EVENING INTO THE EARLY MORNING HOURS THURSDAY.
WINDS WILL BE GUSTING UP TO 30 MPH DURING THIS TIME, WHICH MAY
LEAD TO BLOWING SNOW AND REDUCED VISIBILITIES.
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.
WYZ017-018-191215-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF SHOSHONI, RIVERTON, AND LANDER
1206 PM 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 6
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.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE WEDNESDAY EVENING AND THURSDAY MORNING
COMMUTES.
* ADDITIONAL DETAILS...THE HEAVIEST SNOWFALL IS FORECAST TO OCCUR
LATE WEDNESDAY EVENING INTO THE EARLY MORNING HOURS THURSDAY.
WINDS WILL BE GUSTING UP TO 35 MPH DURING THIS TIME, WHICH MAY
LEAD TO BLOWING SNOW AND REDUCED VISIBILITIES.
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.
WYZ019-022-191215-
/O.CON.KRIW.WW.Y.0008.260219T0000Z-260219T1800Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-CASPER MOUNTAIN-
INCLUDING THE CITIES OF JEFFREY CITY
1206 PM 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 6
INCHES. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...CASPER MOUNTAIN AND GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* 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.
* ADDITIONAL DETAILS...THE HEAVIEST SNOWFALL IS FORECAST TO OCCUR
LATE WEDNESDAY EVENING INTO THE EARLY MORNING HOURS THURSDAY.
WINDS WILL BE GUSTING UP TO 45 MPH DURING THIS TIME, WHICH MAY
LEAD TO BLOWING SNOW AND REDUCED VISIBILITIES.
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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