WWUS45 KPIH 210756
WSWPIH

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pocatello ID
156 AM MDT Tue Apr 21 2026

IDZ069-071>074-212100-
/O.NEW.KPIH.WW.Y.0010.260422T0600Z-260423T1200Z/
Lost River Range-Frank Church Wilderness-Sawtooth/Stanley Basin-
Sun Valley Region-Big Lost Highlands/Copper Basin-
Including the cities of Borah Peak, Copper Basin, Galena, Sun
Valley, Stanley, Clayton, and Ketchum
156 AM MDT Tue Apr 21 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM
MDT THURSDAY ABOVE 6500 FEET ELEVATION...

* WHAT...Snow expected ABOVE 6500 FEET ELEVATION. Total snow
  accumulations between 1 and 10 inches. Winds gusting as high as 40
  mph.

* WHERE...Big Lost Highlands/Copper Basin, Frank Church Wilderness,
  Lost River Range, Sawtooth/Stanley Basin, and Sun Valley Region.

* WHEN...From midnight tonight to 6 AM MDT Thursday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the travel Wednesday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Call 5 1 1 or visit
511.idaho.gov for the latest road conditions.

&&

$$

IDZ060-063-064-066-212100-
/O.NEW.KPIH.WW.Y.0010.260422T1800Z-260424T0600Z/
Bear River Range-Caribou Range-Big Hole Mountains-Centennial
Mountains - Island Park-
Including the cities of Swan Valley, Emigration Summit, Victor,
Island Park, Wayan, and Kilgore
156 AM MDT Tue Apr 21 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM NOON WEDNESDAY TO MIDNIGHT
MDT THURSDAY NIGHT ABOVE 6500 FEET ELEVATION...

* WHAT...Snow expected ABOVE 6500 FEET ELEVATION. Total snow
  accumulations between 2 and 14 inches. Winds gusting as high as 40
  mph.

* WHERE...Big Hole Mountains, Centennial Mountains - Island Park,
  Bear River Range, and Caribou Range.

* WHEN...From noon Wednesday to midnight MDT Thursday Night.

* IMPACTS...Travel could be very difficult. The hazardous conditions
  could impact travel from Wednesday afternoon through Thursday
  evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Call 5 1 1 or visit
511.idaho.gov for the latest road conditions.

&&

$$

Visit weather.gov/pocatello for more information.

Messick