851
FOUS11 KWBC 072059
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
359 PM EST SAT MAR 7 2026
VALID 00Z SUN MAR 08 2026 - 00Z WED MAR 11 2026
..PACIFIC NORTHWEST
DAYS 1-3...
A STRONG EASTERN PACIFIC RIDGE AXIS OVER THE NORTHWEST IS FORECAST
TO FLATTEN TONIGHT AMID STRONG HEIGHT-FALLS FROM A DIGGING TROUGH
IN THE GULF OF ALASKA. ACCORDINGLY, STRONG ZONAL ONSHORE FLOW
WILL SET IN ACROSS THE PACIFIC NORTHWEST BY EARLY TOMORROW. AS
HIGHLIGHTED OVERNIGHT, SNOW LEVELS IN THE PREFRONTAL AIRMASS WILL
BE QUITE HIGH TO BEGIN SUNDAY -- AROUND 6-7000 FEET, BUT SHOULD
DECREASE TO 500-1000 FEET BY MONDAY MORNING. THUS, SNOWFALL IN THE
DAY 1 PERIOD SHOULD BE RELEGATED TO THE NORTHERN REACHES OF THE
CASCADES, WHERE THE LATEST PWPF SHOWS 60% PROBABILITIES FOR >4"
ATOP STEVENS PASS. THE UNSETTLED PATTERN WILL CONTINUE INTO NEXT
WEEK AS A DIGGING JET-STREAK AND SHORTWAVE APPROACH ON MONDAY,
LEADING TO RENEWED SNOWFALL AT AND BELOW PASS LEVEL. BY DAYS 2-3,
SNOW PROBS FOR >6" ARE 50-90% FOR THE WA CASCADES AND THE OLYMPICS.
..NORTHERN ROCKIES TO THE UPPER MIDWEST
LATE DAY 2-3...
SNOWFALL IS EXPECTED TO EXPAND ALONG THE NORTHERN FLANK OF A
DEVELOPING LEE-SIDE LOW ON MONDAY. A LINGERING PACIFIC MOISTURE
PLUME, SUPERIMPOSED WITH A CORRIDOR OF 850-700 MB FRONTOGENESIS
AND RIGHT ENTRANCE ASCENT WILL LEAD TO AN EAST-WEST TRANSLATING
AREA OF SNOWFALL ATOP THE NORTHERN PLAINS AND UPPER MIDWEST. THE
PROGRESSIVE NATURE OF THIS BAND SHOULD LIMIT OVERALL SNOWFALL
AMOUNTS HOWEVER, EVIDENCED BY THE LATEST PWPF WHICH SHOWS 20%
PROBABILITIES OF >4" IN NORTHEAST MN.
ASHERMAN/JACKSON
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