981
WWUS45 KRIW 161918
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
118 PM MDT THU APR 16 2026
WYZ016>018-162030-
/O.CAN.KRIW.WW.Y.0015.260416T2100Z-260417T1200Z/
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF LANDER, RIVERTON, SHOSHONI, AND DUBOIS
118 PM MDT THU APR 16 2026
..WINTER WEATHER ADVISORY IS CANCELLED
DUE TO DECREASING PRECIPITATION CHANCES AND LESS CONFIDENCE IN A
PERIOD OF UPSLOPING SNOWFALL FRIDAY MORNING, THE WINTER WEATHER
ADVISORIES FOR THE WIND RIVER BASIN AND LANDER FOOTHILLS HAVE BEEN
CANCELLED. A FEW CONVECTIVE RAIN/SNOW SHOWERS MAY BE POSSIBLE THIS
AFTERNOON AND EVENING BUT IMPACTS LIKELY REMAIN MINIMAL. ANOTHER
ROUND OF LIGHT SNOW MAY OCCUR FRIDAY MORNING BUT ANY ACCUMULATIONS
LOOK LIGHT, RANGING FROM A TRACE TO POSSIBLY AN INCH OR TWO IN VERY
ISOLATED LOCATIONS.
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 MAMMOTH, LAKE, AND OLD FAITHFUL
118 PM MDT THU APR 16 2026
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY
* WHAT...HEAVY SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO 3 INCHES
WITH AMOUNTS NEARING 6 INCHES ALONG THE HIGHEST PEAKS. WINDS
GUSTING AS HIGH AS 35 MPH.
* WHERE...ABSAROKA MOUNTAINS, TETON AND GROS VENTRE MOUNTAINS, AND
YELLOWSTONE NATIONAL PARK.
* WHEN...UNTIL 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.
WYZ014-015-171300-
/O.CON.KRIW.WS.W.0004.000000T0000Z-260418T0000Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
118 PM MDT THU APR 16 2026
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT FRIDAY
* WHAT...HEAVY SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO 5 INCHES
MAINLY ALONG THE HIGHEST PEAKS. WINDS GUSTING AS HIGH AS 40 MPH.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...UNTIL 6 PM MDT FRIDAY.
* 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-
118 PM MDT THU APR 16 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO 6 INCHES WITH
AMOUNTS NEARING 9 INCHES ALONG THE HIGHEST PEAKS. WINDS GUSTING AS
HIGH AS 45 MPH.
* WHERE...BIGHORN MOUNTAINS SOUTHEAST AND BIGHORN MOUNTAINS WEST.
* WHEN...UNTIL 6 AM MDT FRIDAY.
* IMPACTS...TRAVEL COULD BE DIFFICULT, ESPECIALLY OVER POWDER RIVER
PASS. 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.
WYZ010-011-171200-
/O.CON.KRIW.WW.Y.0015.000000T0000Z-260417T1200Z/
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
INCLUDING THE CITIES OF KAYCEE AND BUFFALO
118 PM MDT THU APR 16 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 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. EXPECT TEMPERATURES BELOW 28 DEGREES FRIDAY
MORNING.
* WHERE...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY.
* WHEN...UNTIL 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.
WYZ019-022-171300-
/O.CON.KRIW.WW.Y.0015.260416T2100Z-260417T1800Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-CASPER MOUNTAIN-
INCLUDING THE CITIES OF JEFFREY CITY
118 PM MDT THU APR 16 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT FRIDAY
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES
FOR CASPER MOUNTAIN. THE GREEN MOUNTAINS AND RATTLESNAKE RANGE
LIKELY SEE LESSER AMOUNTS UP TO 3 INCHES WITH ISOLATED LOCATIONS
NEARING 5 INCHES. WINDS GUSTING AS HIGH AS 45 MPH.
* WHERE...CASPER MOUNTAIN AND GREEN MOUNTAINS AND RATTLESNAKE RANGE.
* WHEN...UNTIL 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.
WYZ020-171300-
/O.CON.KRIW.WW.Y.0015.260416T2100Z-260417T1800Z/
NATRONA COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF CASPER
118 PM MDT THU APR 16 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT FRIDAY
* WHAT...SNOW, WIND, AND COLD EXPECTED. TOTAL SNOW ACCUMULATIONS
BETWEEN 1 AND 3 INCHES, WITH LOCALIZED AMOUNTS UP TO 4 INCHES
POSSIBLE. WINDS GUSTING BETWEEN 45 AND 55 MPH. EXPECT TEMPERATURES
BELOW 28 DEGREES FRIDAY MORNING.
* WHERE...NATRONA COUNTY LOWER ELEVATIONS.
* WHEN...UNTIL 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/ .
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