591  
WWUS45 KPIH 230923  
WSWPIH  
 
URGENT - WINTER WEATHER MESSAGE  
NATIONAL WEATHER SERVICE POCATELLO ID  
323 AM MDT SAT OCT 23 2021  
 
IDZ069-071>074-232200-  
/O.CON.KPIH.WS.A.0005.211024T1800Z-211025T1800Z/  
LOST RIVER RANGE-FRANK CHURCH WILDERNESS-SAWTOOTH/STANLEY BASIN-  
SUN VALLEY REGION-BIG LOST HIGHLANDS/COPPER BASIN-  
INCLUDING THE CITIES OF BORAH PEAK, CLAYTON, STANLEY, KETCHUM,  
SUN VALLEY, GALENA, AND COPPER BASIN  
323 AM MDT SAT OCT 23 2021  
 
...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON  
THROUGH MONDAY MORNING...  
 
* WHAT...HEAVY WET SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS OF A  
COATING TO 3 INCHES BELOW ABOUT 7,000 FEET, WITH 3 TO 12  
INCHES ABOVE ABOUT 7,000 FEET AND LOCALLY HIGHER AMOUNTS NEAR  
PEAKS AND RIDGES. WINDS COULD GUST AS HIGH AS 35 MPH WITH  
LOCALIZED BLOWING SNOW, ESPECIALLY AS YOU INCREASE IN  
ELEVATION.  
 
* WHERE...PORTIONS OF THE IDAHO CENTRAL MOUNTAINS, INCLUDING BUT  
NOT LIMITED TO THE FRANK CHURCH WILDERNESS, BANNER SUMMIT,  
SAWTOOTH MOUNTAINS, GALENA SUMMIT, THE BIG LOST HIGHLANDS, AND  
LOST RIVER RANGE.  
 
* WHEN...FROM SUNDAY AFTERNOON THROUGH MONDAY MORNING.  
 
* IMPACTS...WHILE SLICK CONDITIONS AND LIGHT ACCUMULATIONS MAY  
OCCUR DOWN INTO STANLEY, KETCHUM, AND SUN VALLEY DURING THIS  
EVENT, THE GREATEST CONCERN FOR VERY DIFFICULT TRAVEL WILL EXIST  
OVER GALENA SUMMIT, AS WELL AS FOR LOCAL AND BACKCOUNTRY ROADS  
ABOVE ABOUT 7,000 FEET. THE MONDAY MORNING COMMUTE WILL LIKELY  
BE IMPACTED. IN ADDITION, THE HEAVY, WET NATURE OF THE SNOW MAY  
STRAIN WEAKER STRUCTURES AND TREE LIMBS.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION.  
 

 
 

 
 
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE VISIT  
HTTPS://WEATHER.GOV/POCATELLO  
 
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