706
WWUS45 KRIW 161752
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1152 AM MDT SAT MAY 16 2026
WYZ015-171330-
/O.UPG.KRIW.WS.A.0006.260518T0000Z-260519T0000Z/
/O.NEW.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
WIND RIVER MOUNTAINS EAST-
1152 AM MDT SAT MAY 16 2026
...WINTER STORM WARNING IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS BETWEEN 8 AND
16 INCHES POSSIBLE. WINDS COULD GUST AS HIGH AS 50 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES, 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 .
WYZ019-171330-
/O.UPG.KRIW.WS.A.0006.260518T0000Z-260519T0000Z/
/O.NEW.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
INCLUDING THE CITIES OF JEFFREY CITY
1152 AM MDT SAT MAY 16 2026
...WINTER STORM WARNING IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS BETWEEN 6 AND
11 INCHES POSSIBLE. WINDS COULD GUST AS HIGH AS 50 MPH.
* WHERE...GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES.
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 .
WYZ022-171330-
/O.UPG.KRIW.WS.A.0006.260518T0000Z-260519T0000Z/
/O.NEW.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
CASPER MOUNTAIN-
1152 AM MDT SAT MAY 16 2026
...WINTER STORM WARNING IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS BETWEEN 7 AND
14 INCHES POSSIBLE. WINDS COULD GUST AS HIGH AS 40 MPH.
* WHERE...CASPER MOUNTAIN.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES.
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 .
WYZ020-171330-
/O.NEW.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER
1152 AM MDT SAT MAY 16 2026
...WINTER STORM WARNING IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND
5 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 SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES.
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 .
WYZ030-171330-
/O.NEW.KRIW.WS.W.0005.260518T0000Z-260519T0000Z/
EAST SWEETWATER COUNTY-
INCLUDING THE CITIES OF WAMSUTTER
1152 AM MDT SAT MAY 16 2026
...WINTER STORM WARNING IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND
6 INCHES. WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...EAST SWEETWATER COUNTY.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ALONG INTERSTATE
80. THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY MORNING AND
EVENING COMMUTES.
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 .
WYZ002-007>009-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
ABSAROKA MOUNTAINS-OWL CREEK AND BRIDGER MOUNTAINS-BIGHORN
MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY 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 SUNDAY 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 .
WYZ003-005-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
CODY FOOTHILLS-SOUTHWEST BIGHORN BASIN-
INCLUDING THE CITIES OF CODY, MEETEETSE, THERMOPOLIS, AND CLARK
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 1 TO 3 INCHES.
WINDS GUSTING AS HIGH AS 55 MPH.
* WHERE...SOUTHWEST BIGHORN BASIN AND CODY FOOTHILLS.
* WHEN...FROM 6 PM SUNDAY 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
AND EVENING COMMUTES.
* ADDITIONAL DETAILS...THERE IS POTENTIAL FOR A STEEP GRADIENT IN
SNOW TOTALS ALONG THE MOUNTAINS, WITH SNOW TOTALS QUICKLY GOING
FROM AROUND 1 INCH TO 4 INCHES OR MORE.
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 .
WYZ010-011-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF BUFFALO AND KAYCEE
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY 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 SUNDAY 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
AND EVENING COMMUTES.
* ADDITIONAL DETAILS...GREATEST SNOW TOTALS WILL OCCUR ALONG THE
MOUNTAINS AND FURTHER SOUTHWARDS TOWARDS KAYCEE.
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 .
WYZ014-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
WIND RIVER MOUNTAINS WEST-
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 8
INCHES. WINDS GUSTING AS HIGH AS 50 MPH.
* WHERE...WIND RIVER MOUNTAINS WEST.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ALONG SOUTH PASS.
THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY 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 .
WYZ016-017-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
UPPER WIND RIVER BASIN-WIND RIVER BASIN-
INCLUDING THE CITIES OF RIVERTON, DUBOIS, AND SHOSHONI
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 1 AND 4
INCHES. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...UPPER WIND RIVER BASIN AND WIND RIVER BASIN.
* WHEN...FROM 6 PM SUNDAY 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 .
WYZ018-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
LANDER FOOTHILLS-
INCLUDING THE CITIES OF LANDER
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3 AND 6
INCHES.
* WHERE...LANDER FOOTHILLS.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES.
* ADDITIONAL DETAILS...THERE WILL LIKELY BE A STEEP GRADIENT IN SNOW
TOTALS IN LANDER TOWN TOWARDS THE MOUNTAINS. AMOUNTS WILL LIKELY
QUICKLY CHANGE FROM 3 TO 6 INCHES IN TOWN TO 10 INCHES OR MORE AT
SINKS 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 .
WYZ026-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
UPPER GREEN RIVER BASIN-
INCLUDING THE CITIES OF FARSON, LA BARGE, AND BIG PINEY
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 1 TO 3. WINDS
GUSTING AS HIGH AS 45 MPH.
* WHERE...UPPER GREEN RIVER BASIN.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MONDAY MORNING AND EVENING COMMUTES.
* ADDITIONAL DETAILS...GREATEST IMPACTS WILL BE FURTHER SOUTH,
TOWARDS FARSON. HERE, WINDS AND SNOW TOTALS WILL BE GREATEST.
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 .
WYZ028-029-171330-
/O.NEW.KRIW.WW.Y.0019.260518T0000Z-260519T0000Z/
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-
INCLUDING THE CITIES OF GREEN RIVER AND ROCK SPRINGS
1152 AM MDT SAT MAY 16 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM SUNDAY TO 6 PM MDT
MONDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 5
INCHES. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...FLAMING GORGE AND ROCK SPRINGS AND GREEN RIVER.
* WHEN...FROM 6 PM SUNDAY TO 6 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ALONG INTERSTATE
80. THE HAZARDOUS CONDITIONS COULD IMPACT THE MONDAY 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 .
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE, VISIT
HTTPS://WEATHER.GOV/RIW/ .
WITTMANN
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