810
FOUS11 KWBC 230726
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
326 AM EDT MON MAR 23 2026
VALID 12Z MON MAR 23 2026 - 12Z THU MAR 26 2026
..NORTHERN NEW ENGLAND
DAY 1...
AN INVERTED TROUGH, EXTENDING BACK FROM THE DEPARTING STORM SYSTEM
RESPONSIBLE FOR ROUNDS OF SNOW YESTERDAY, WILL LINGER ACROSS
NORTHERN NEW ENGLAND TODAY. WITH SUFFICIENT LOW-LEVEL MOISTURE OFF
THE ATLANTIC AND VERTICAL ASCENT SUPPLIED BY AN APPROACHING
SHORTWAVE TROUGH TO THE WEST, PERIODS OF SNOW WILL CONTINUE OVER
THE WHITE MOUNTAINS. SOME LIGHT SNOW IS POSSIBLE BELOW 1,000FT, BUT
GIVEN THE SNOW IS OCCURRING DURING DAYTIME HOURS, SNOW WILL
STRUGGLE TO ACCUMULATE ON PAVED SURFACES. WPC PROBABILITIES DEPICT
MODERATE-TO-HIGH CHANCES (50-70%) FOR ADDITIONAL SNOWFALL
ACCUMULATIONS >4" IN THE WHITE MOUNTAINS, WHICH INCLUDED MOUNT
WASHINGTON. OTHERWISE, ANY ADDITIONAL SNOWFALL ACCUMULATIONS BELOW
2,000FT ARE LIKELY TO RANGE BETWEEN A COATING-3".
..WASHINGTON CASCADES & OLYMPICS
DAYS 1-3...
A STRONG AND MEANDERING CLOSED UPPER LOW IN THE GULF OF ALASKA WILL
DIRECT A STORM SYSTEM FORMING ON ITS SOUTHERN FLANK AT BRITISH
COLUMBIA THE FIRST HALF OF THE WEEK. WITH THE GULF OF ALASKA LOW
SLOW TO MOVE EAST AND LOW LEVEL RIDGING IN PLACE OFF THE SOUTHERN
CA COAST, LOW-LEVEL SWRLY FLOW WILL SUPPLY A NARROW CORRIDOR OF
PACIFIC MOISTURE INTO THE PACIFIC NORTHWEST MONDAY NIGHT AND
THROUGH BOTH TUESDAY AND INTO WEDNESDAY. SNOW LEVELS WILL GENERALLY
RESIDE ABOVE 3,000FT THROUGH TUESDAY, BUT A COLD FRONTAL PASSAGE
AND FALLING 700-500MB HEIGHTS TUESDAY NIGHT WILL CAUSE SNOW LEVELS
TO DIP TO AS LOW AS 2,000FT BY WEDNESDAY. STILL, THE COLD AIR IN
WAKE OF THE COLD FRONTAL PASSAGE IS NOT PARTICULARLY COLD, AND THE
BEST MOISTURE ADVECTION WILL HAVE ALREADY CONCLUDED BY WEDNESDAY.
THIS IS LIKELY TO CAUSE PERIODS OF MOUNTAIN SNOW ON WEDNESDAY IN
THE OLYMPICS AND CASCADES TO AS LOW AS 2,000FT, BUT RATES WILL NOT
BE OVERLY HEAVY EVEN THROUGH WEDNESDAY NIGHT.
WPC PROBABILITIES FOR >4" OF SNOW ARE MODERATE-TO-HIGH (50-80%) FOR
ELEVATIONS ABOVE 4,000FT NORTH OF I-90. STEVENS PASS SPORTS
MODERATE-TO-HIGH CHANCES (50-80%) FOR SNOWFALL TOTALS >4" THROUGH
WEDNESDAY NIGHT, WHILE SNOQUALMIE PASS HAS MODERATE CHANCES
(40-60%). BOTH PASSES SPORT LOW-TO-MODERATE CHANCES (20-40%) FOR
SNOWFALL TOTALS >8", SO SOME LOCALLY HAZARDOUS TRAVEL CONDITIONS
ARE POSSIBLE AT PASS LEVEL, BUT THE HEAVIER TOTALS SURPASSING 8"
WILL LIKELY BE FOUND AT HIGHER ELEVATIONS FOR THIS EVENT.
THE CHANCES FOR SIGNIFICANT ICE ACROSS THE CONUS IS LESS THAN
10 PERCENT.
MULLINAX
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page