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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