363
FOUS11 KWBC 280647
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
247 AM EDT SAT MAR 28 2026
VALID 12Z SAT MAR 28 2026 - 12Z TUE MAR 31 2026
..PACIFIC NORTHWEST/NORTHERN ROCKIES
DAYS 2-3...
A CLOSED LOW SOUTH OF THE GULF OF ALASKA WILL CONTINUE
SOUTHEASTWARD TODAY AND SLOWLY WEAKEN INTO A POSITIVELY-TILTED
UPPER TROUGH AS ITS COLD FRONT MOVES THROUGH WA/OR ON SUNDAY.
DESPITE SOME INJECTION OF MID-LATITUDE PACIFIC MOISTURE, THE SYSTEM
WILL BE PROGRESSIVE AND QPF WILL BE LIMITED. SNOW LEVELS WILL BE
ON THE LOWER SIDE -- 2500-4000FT IN THE CASCADES BEFORE LOWERING
FURTHER BEHIND THE FRONT TO 1500-3000FT. THIS WILL BRING SOME SNOW
TO THE PASSES AND PROBABILITIES FOR AT LEAST 6 INCHES ARE AT LEAST
50% ABOVE ABOUT 3000FT OR SO FOR THE NORTHERN CASCADES.
FARTHER EAST, MOISTURE WILL STREAM INTO THE NORTHERN ROCKIES AND
EVENTUALLY INTO NORTHERN/NORTHWESTERN WYOMING SUNDAY EVENING
THROUGH MONDAY AND OVERNIGHT INTO VERY EARLY TUESDAY, ENDING FROM
WEST/NORTHWEST TO EAST/SOUTHEAST. AMOUNTS WILL AGAIN BE GENERALLY
LIGHT, WITH PROBABILITIES OF AT LEAST 6 INCHES AT LEAST 50% ABOVE
ABOUT 5000FT IN ID/MT BUT ABOVE 9000-10,000FT IN WY.
FRONT END OF THE PRECIP SHIELD ADVANCING ACROSS THE NORTHERN
PLAINS COULD SUPPORT SOME LIGHT ICING OVER NORTHERN ND EARLY MONDAY
WITH GENERALLY A FEW HUNDREDTHS OF AN INCH POSSIBLE.
THE PROBABILITY OF SIGNIFICANT ICING ACROSS THE CONUS FOR DAYS 1-3
IS LESS THAN 10%.
FRACASSO
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