166
WWUS45 KRIW 170746
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
146 AM MDT SUN MAY 17 2026
WYZ015-180015-
/O.CON.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
WIND RIVER MOUNTAINS EAST-
146 AM MDT SUN MAY 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 9 AND
18 INCHES, WITH LOCALLY HIGHER AMOUNTS AT THE HIGHEST ELEVATIONS.
WINDS GUSTING AS HIGH AS 60 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING COMMUTE, INCLUDING OVER SOUTH PASS.
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 .
WYZ019-180015-
/O.CON.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
INCLUDING THE CITIES OF JEFFREY CITY
146 AM MDT SUN MAY 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT MONDAY...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS BETWEEN 6 AND
12 INCHES POSSIBLE. WINDS COULD GUST AS HIGH AS 50 MPH.
* WHERE...GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING COMMUTE.
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 .
WYZ020-180015-
/O.CON.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER
146 AM MDT SUN MAY 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND
6 INCHES. AREAS OF HIGHER AMOUNTS UP TO TO 7 INCHES BETWEEN HILAND
AND CASPER. WINDS GUSTING AS HIGH AS 40 MPH.
* WHERE...NATRONA COUNTY LOWER ELEVATIONS.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING COMMUTE.
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 .
WYZ022-180015-
/O.CON.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
CASPER MOUNTAIN-
146 AM MDT SUN MAY 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT MONDAY...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS BETWEEN 8 AND
16 INCHES POSSIBLE. WINDS COULD GUST AS HIGH AS 40 MPH.
* WHERE...CASPER MOUNTAIN.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. AREAS OF BLOWING SNOW
COULD SIGNIFICANTLY REDUCE VISIBILITY. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING COMMUTE.
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 .
WYZ030-180015-
/O.CON.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
EAST SWEETWATER COUNTY-
INCLUDING THE CITIES OF WAMSUTTER
146 AM MDT SUN MAY 17 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 4 AND
8 INCHES. WINDS GUSTING AS HIGH AS 55 MPH.
* WHERE...EAST SWEETWATER COUNTY.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING COMMUTE, ESPECIALLY ALONG
INTERSTATE 80.
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 .
WYZ027-180015-
/O.EXA.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
SOUTH LINCOLN COUNTY-
INCLUDING THE CITIES OF KEMMERER AND COKEVILLE
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM
MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 4
INCHES. WINDS GUSTING AS HIGH AS 40 MPH.
* WHERE...SOUTH LINCOLN COUNTY.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ002-007>009-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
ABSAROKA MOUNTAINS-OWL CREEK AND BRIDGER MOUNTAINS-BIGHORN
MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 4 AND 8
INCHES, WITH 7 TO 12 INCHES AT THE HIGHEST ELEVATIONS OF THE
SOUTHERN ABSAROKA AND SOUTHERN BIGHORN MOUNTAINS. WINDS GUSTING AS
HIGH AS 50 MPH.
* WHERE...OWL CREEK AND BRIDGER MOUNTAINS, BIGHORN MOUNTAINS
SOUTHEAST, BIGHORN MOUNTAINS WEST, AND ABSAROKA MOUNTAINS.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY OVER MOUNTAIN
PASSES SUCH AS 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 .
WYZ003-005-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
CODY FOOTHILLS-SOUTHWEST BIGHORN BASIN-
INCLUDING THE CITIES OF MEETEETSE, THERMOPOLIS, CODY, AND CLARK
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS UP TO 3 INCHES.
WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...SOUTHWEST BIGHORN BASIN AND CODY FOOTHILLS.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT DUE TO A COMBINATION OF SNOW
AND WIND. THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY
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 .
WYZ010-011-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF KAYCEE AND BUFFALO
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS UP TO 3 INCHES.
WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ014-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
WIND RIVER MOUNTAINS WEST-
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 4 AND 8
INCHES. WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...WIND RIVER MOUNTAINS WEST.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ALONG SOUTH PASS.
THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ016-017-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
UPPER WIND RIVER BASIN-WIND RIVER BASIN-
INCLUDING THE CITIES OF RIVERTON, DUBOIS, AND SHOSHONI
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 1 AND 4
INCHES, WITH LOCALLY HIGHER AMOUNTS ARE POSSIBLE AROUND HUDSON AND
FORT WASHAKIE. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...UPPER WIND RIVER BASIN AND WIND RIVER BASIN.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT DUE TO A COMBINATION OF SNOW
AND WIND. THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ018-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
LANDER FOOTHILLS-
INCLUDING THE CITIES OF LANDER
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 6
INCHES, WITH HIGHER AMOUNTS POSSIBLE NEAR SINKS CANYON PARK.
* WHERE...LANDER FOOTHILLS.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY 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 .
WYZ026-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
UPPER GREEN RIVER BASIN-
INCLUDING THE CITIES OF BIG PINEY, LA BARGE, AND FARSON
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 1 TO 3 INCHES.
WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...UPPER GREEN RIVER BASIN.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS
CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ028-029-180015-
/O.CON.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-
INCLUDING THE CITIES OF GREEN RIVER AND ROCK SPRINGS
146 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 6 PM MDT MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 5
INCHES. WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...FLAMING GORGE AND ROCK SPRINGS AND GREEN RIVER.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ALONG INTERSTATE
80. THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY 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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