549  
FOUS11 KWBC 220624  
QPFHSD  
 
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
224 AM EDT WED OCT 22 2025  
 
VALID 12Z WED OCT 22 2025 - 12Z SAT OCT 25 2025  
   
..HIGH SIERRA NEVADA
 
 
DAY 1...  
 
AN UPPER LOW JUST SOUTHWEST OF SOUTHERN CALIFORNIA THIS MORNING  
WILL MOVE INLAND AND CROSS THE SOUTHERN SIERRA NEVADA THIS EVENING,  
BRINING SOME LIGHT SNOW TO THE HIGH MOUNTAINS. SNOW LEVELS AROUND  
10,000FT WILL ONLY FALL TO AROUND 9500FT AS THE UPPER LOW PASSES  
THROUGH. WPC PROBABILITIES FOR AT LEAST 6 INCHES OF SNOW ARE LOW  
(10-30%) ABOVE 10,000-10,500FT.  
 
   
..COLORADO ROCKIES
 
 
DAY 2...  
 
ON THURSDAY, THE CA UPPER LOW WILL TRACK INTO THE FOUR CORNERS  
REGION WITH SOME BROAD JET-DIVERGENCE ATOP A MOISTENING MID/LOWER-  
LAYER. PWS WILL CLIMB TO NEAR 0.50 INCHES WITH UPSLOPE-DRIVEN SNOW  
INTO THE SAN JUANS NORTHWARD TO THE CENTRAL CO RANGES. SNOW LEVELS  
WILL BE HIGH -- 11,000FT TO START ON THURSDAY THEN FALLING TO  
AROUND 9500FT FRIDAY MORNING AS THE UPPER LOW MOVES. STILL, THIS  
WILL AFFECT THE HIGH MOUNTAIN PASSES SUCH AS I-70/EISENHOWER  
TUNNEL. WPC PROBABILITIES FOR AT LEAST 6 INCHES OF SNOW ARE >50%  
ABOVE ABOUT 11,000FT. THE HIGHEST PEAKS IN THE SAWATCH RANGE  
(>12,000FT) MAY SEE MORE THAN 8-10 INCHES OF SNOW (30-60% CHANCE).  
 
   
..NORTHERN CASCADES
 
 
DAY 3...  
 
DEEP NORTHEASTERN PACIFIC TROUGH ON FRIDAY WILL STRONG COLD FRONT  
INTO WA AND OR. HIGHER SNOW LEVELS AHEAD OF THE FRONT (6000-7000FT)  
WILL SHARPLY DROP OVERNIGHT INTO EARLY SATURDAY TO AROUND  
5000-6000FT (NORTH TO SOUTH ALONG THE WA TO OR CASCADES). WPC  
PROBABILITIES FOR AT LEAST 6 INCHES OF SNOW THROUGH 12Z SAT ARE  
>50% ABOVE ABOUT 6000FT IN THE WA CASCADES WITH MORE SNOW TO FOLLOW  
INTO THE WEEKEND.  
 
THE PROBABILITY OF SIGNIFICANT ICE ACROSS THE CONUS IS LESS THAN  
10 PERCENT.  
 
FRACASSO  
 

 
 
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