516
WWUS45 KRIW 170637
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1237 AM MDT FRI APR 17 2026
WYZ001-002-012-171200-
/O.CON.KRIW.WS.W.0004.000000T0000Z-260417T1200Z/
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-TETON AND GROS
VENTRE MOUNTAINS-
INCLUDING THE CITIES OF OLD FAITHFUL, MAMMOTH, AND LAKE
1237 AM MDT FRI APR 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS
MORNING...
* WHAT...HEAVY SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 3 INCHES.
* WHERE...ABSAROKA MOUNTAINS, TETON AND GROS VENTRE MOUNTAINS, AND
YELLOWSTONE NATIONAL PARK.
* WHEN...UNTIL 6 AM MDT EARLY THIS MORNING.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT, ESPECIALLY ACROSS TETON
PASS AND TOGWOTEE PASS. STRONG WINDS WILL CAUSE LIMITED VISIBILITY.
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 .
WYZ014-015-171200-
/O.CON.KRIW.WS.W.0004.000000T0000Z-260418T0000Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
1237 AM MDT FRI APR 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...
* WHAT...HEAVY SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO TWO INCHES.
WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...UNTIL 6 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ACROSS SOUTH PASS.
STRONG WINDS WILL CAUSE LIMITED VISIBILITY.
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 .
WYZ008-009-171200-
/O.CON.KRIW.WW.Y.0015.000000T0000Z-260417T1200Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1237 AM MDT FRI APR 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT EARLY
THIS MORNING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 4 INCHES.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...UNTIL 6 AM MDT EARLY THIS MORNING.
* IMPACTS...PLAN ON SLIPPERY ROAD 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 .
WYZ010-011-171200-
/O.CON.KRIW.WW.Y.0015.000000T0000Z-260417T1200Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF BUFFALO AND KAYCEE
1237 AM MDT FRI APR 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT EARLY
THIS MORNING...
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO TWO INCHES.
* WHERE...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY.
* WHEN...UNTIL 6 AM MDT EARLY THIS MORNING.
* IMPACTS...PLAN ON SLIPPERY ROAD 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 .
WYZ019-022-171200-
/O.CON.KRIW.WW.Y.0015.000000T0000Z-260417T1800Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-CASPER MOUNTAIN-
INCLUDING THE CITIES OF JEFFREY CITY
1237 AM MDT FRI APR 17 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 4 INCHES.
* WHERE...CASPER MOUNTAIN AND GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* WHEN...UNTIL NOON MDT TODAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE FRIDAY MORNING COMMUTE.
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 .
WYZ020-171200-
/O.CON.KRIW.WW.Y.0015.000000T0000Z-260417T1800Z/
NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER
1237 AM MDT FRI APR 17 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 3 INCHES.
* WHERE...NATRONA COUNTY LOWER ELEVATIONS.
* WHEN...UNTIL NOON MDT TODAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE FRIDAY MORNING COMMUTE.
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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