873
WWUS45 KRIW 151756
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1156 AM MDT WED APR 15 2026
WYZ001-002-012-161300-
/O.CON.KRIW.WS.W.0004.260416T0000Z-260417T1200Z/
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-TETON AND GROS
VENTRE MOUNTAINS-
INCLUDING THE CITIES OF LAKE, MAMMOTH, AND OLD FAITHFUL
1156 AM MDT WED APR 15 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 AM MDT FRIDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 9 AND
18 INCHES, WITH THE HIGHEST ELEVATIONS COULD SEE UP TO 20 INCHES.
WINDS GUSTING BETWEEN 30 AND 50 MPH. HIGHER ELEVATIONS COULD GUST
UP TO 55 MPH.
* WHERE...ABSAROKA MOUNTAINS, TETON AND GROS VENTRE MOUNTAINS, AND
YELLOWSTONE NATIONAL PARK.
* WHEN...FROM 6 PM THIS EVENING TO 6 AM MDT FRIDAY.
* 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 .
WYZ014-015-161300-
/O.CON.KRIW.WS.W.0004.260416T0000Z-260418T0000Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
1156 AM MDT WED APR 15 2026
...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT FRIDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 9 AND
18 INCHES ACROSS THE MOUNTAINS. EXPECT SNOW ACCUMULATIONS OF 5 TO
7 INCHES FOR SOUTH PASS. WINDS GUSTING BETWEEN 45 AND 60 MPH,
INCLUDING ACROSS SOUTH PASS.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...FROM 6 PM THIS EVENING TO 6 PM MDT FRIDAY.
* IMPACTS...TRAVEL COULD BE VERY 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 .
WYZ008-009-161300-
/O.NEW.KRIW.WW.Y.0015.260416T1500Z-260417T1200Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1156 AM MDT WED APR 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM THURSDAY TO 6 AM MDT
FRIDAY...
* WHAT...SNOW AND WIND EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 6
AND 13 INCHES FOR ELEVATIONS ABOVE 7,000 FEET. TOTAL SNOW
ACCUMULATIONS OF 9 TO 12 INCHES ACROSS POWDER RIVER PASS. WINDS
GUSTING BETWEEN 35 AND 55 MPH.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...FROM 9 AM THURSDAY TO 6 AM MDT FRIDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY OVER POWDER RIVER
PASS, ON THURSDAY. GUSTY WINDS WILL CAUSE LIMITED VISIBILITY.
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 .
WYZ010-011-161300-
/O.NEW.KRIW.WW.Y.0015.260416T1800Z-260417T1200Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF KAYCEE AND BUFFALO
1156 AM MDT WED APR 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM NOON THURSDAY TO 6 AM MDT
FRIDAY...
* WHAT...SNOW, WIND, AND COLD EXPECTED. TOTAL SNOW ACCUMULATIONS
BETWEEN 1 AND 3 INCHES WITH GUSTY NORTH WINDS. WINDS GUSTING
BETWEEN 35 AND 55 MPH, WITH GUSTS OF 60 MPH POSSIBLE. EXPECT
TEMPERATURES BELOW 28 DEGREES FRIDAY MORNING.
* WHERE...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY.
* WHEN...FROM NOON THURSDAY TO 6 AM MDT FRIDAY.
* IMPACTS...PLAN ON HAZARDOUS ROAD CONDITIONS, INCLUDING ALONG I-25.
GUSTY WINDS AND SNOW WILL CAUSE LIMITED VISIBILITY. VULNERABLE
OUTDOOR EQUIPMENT AND VEGETATION COULD BE IMPACTED BY FREEZING
TEMPERATURES.
* ADDITIONAL DETAILS...SNOW SQUALLS ARE POSSIBLE THURSDAY AFTERNOON
AND EVENING. IF A SNOW SQUALL DOES OCCUR, EXPECT INSTANCES OF VERY
LOW VISIBILITIES. TEMPERATURES WILL DROP BELOW 28 DEGREES BY
FRIDAY MORNING.
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>018-161300-
/O.NEW.KRIW.WW.Y.0015.260416T2100Z-260417T1200Z/
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF LANDER, SHOSHONI, RIVERTON, AND DUBOIS
1156 AM MDT WED APR 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THURSDAY TO 6 AM MDT
FRIDAY...
* WHAT...SNOW, WIND, AND COLD EXPECTED. TOTAL SNOW ACCUMULATIONS OF
0.5 TO 3 INCHES, WITH ISOLATED AMOUNTS UP TO 5 INCHES POSSIBLE IN
THE LANDER FOOTHILLS. WINDS GUSTING BETWEEN 35 AND 45 MPH, WITH
OCCASIONAL GUSTS AROUND 50 MPH POSSIBLE. EXPECT TEMPERATURES BELOW
28 DEGREES FRIDAY MORNING.
* WHERE...LANDER FOOTHILLS, UPPER WIND RIVER BASIN, AND WIND RIVER
BASIN.
* WHEN...FROM 3 PM THURSDAY TO 6 AM MDT FRIDAY.
* IMPACTS...PLAN ON SLIPPERY AND POTENTIALLY HAZARDOUS ROAD
CONDITIONS, ESPECIALLY ON US 20/26 FROM SHOSHONI TO THE
FREMONT/NATRONA COUNTY LINE. THE HAZARDOUS CONDITIONS COULD IMPACT
TRAVEL ON THURSDAY EVENING. GUSTY WINDS AND SNOW WILL CAUSE
LIMITED VISIBILITY. VULNERABLE OUTDOOR EQUIPMENT AND VEGETATION
COULD BE IMPACTED BY FREEZING TEMPERATURES.
* ADDITIONAL DETAILS...BRIEF PERIODS OF HEAVY SNOW BANDS AND STRONG
WINDS ARE POSSIBLE THURSDAY EVENING, ESPECIALLY ON US 20/26 FROM
SHOSHONI TO THE FREMONT/NATRONA COUNTY LINE. IF A HEAVY BAND OF
SNOW DOES OCCUR, EXPECT INSTANCES OF VERY LOW VISIBILITIES.
TEMPERATURES WILL DROP BELOW 28 DEGREES BY FRIDAY MORNING.
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 .
WYZ019-022-161300-
/O.NEW.KRIW.WW.Y.0015.260416T2100Z-260417T1800Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-CASPER MOUNTAIN-
INCLUDING THE CITIES OF JEFFREY CITY
1156 AM MDT WED APR 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THURSDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW AND WIND EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 3
AND 8 INCHES, WITH LOCALIZED HIGHER AMOUNTS POSSIBLE ACROSS THE
HIGHEST TERRAIN. WINDS GUSTING BETWEEN 35 AND 55 MPH.
* WHERE...CASPER MOUNTAIN AND GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* WHEN...FROM 3 PM THURSDAY TO NOON MDT FRIDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY ACROSS US 287. THE
HAZARDOUS CONDITIONS COULD IMPACT TRAVEL THURSDAY EVENING THROUGH
FRIDAY MORNING. GUSTY WINDS AND SNOW WILL CAUSE LIMITED VISIBILITY.
* ADDITIONAL DETAILS...HEAVY SNOW BANDS AND STRONG WINDS ARE
POSSIBLE THURSDAY EVENING THROUGH FRIDAY MORNING. IF A HEAVY BAND
OF SNOW DOES OCCUR, EXPECT INSTANCES OF VERY LOW 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 .
WYZ020-161300-
/O.NEW.KRIW.WW.Y.0015.260416T2100Z-260417T1800Z/
NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER
1156 AM MDT WED APR 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THURSDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW, WIND, AND COLD EXPECTED. TOTAL SNOW ACCUMULATIONS
BETWEEN 2 AND 5 INCHES, WITH LOCALIZED AMOUNTS UP TO 6 INCHES
POSSIBLE. WINDS GUSTING BETWEEN 45 AND 55 MPH. EXPECT TEMPERATURES
BELOW 28 DEGREES FRIDAY MORNING.
* WHERE...NATRONA COUNTY LOWER ELEVATIONS.
* WHEN...FROM 3 PM THURSDAY TO NOON MDT FRIDAY.
* IMPACTS...PLAN ON HAZARDOUS ROAD CONDITIONS, INCLUDING ALONG US
20/26 FROM THE FREMONT/NATRONA COUNTY LINE AND EAST. GUSTY WINDS
AND SNOW WILL CAUSE LIMITED VISIBILITY. VULNERABLE OUTDOOR
EQUIPMENT AND VEGETATION COULD BE IMPACTED BY FREEZING
TEMPERATURES.
* ADDITIONAL DETAILS...SNOW SQUALLS ARE POSSIBLE THURSDAY AFTERNOON
AND EVENING. IF A SNOW SQUALL DOES OCCUR, EXPECT INSTANCES OF VERY
LOW VISIBILITIES. TEMPERATURES WILL DROP BELOW 28 DEGREES BY
FRIDAY MORNING.
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/ .
GERHARDT
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