602
FXUS01 KWBC 200738
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
237 AM EST SAT DEC 20 2025
VALID 12Z SAT DEC 20 2025 - 12Z MON DEC 22 2025
...THERE IS A MODERATE RISK OF EXCESSIVE RAINFALL OVER PARTS OF
NORTHERN CALIFORNIA ON SUNDAY...
..HEAVY SNOW OVER PARTS OF THE UPPER PENINSULA OF MICHIGAN
..HEAVY SNOW FOR THE CASCADES AND NORTHERN ROCKIES
A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE CENTRAL PLAIN
WILL MOVE EASTWARD OFF THE EAST COAST BY SUNDAY EVENING. ON
SATURDAY, THE SYSTEM WILL PRODUCE HEAVY SNOW OVER PARTS OF THE UP
OF MICHIGAN AND LIGHT TO MODERATE SNOW OVER THE LOWER GREAT
LAKES/NORTHEAST ON SUNDAY. SEE THE WPC HEAVY SNOW DISCUSSION FOR
DETAILS AND AMOUNTS.
MEANWHILE, MOISTURE FROM THE GULF WILL STREAM NORTHWARD OVER THE
LOWER MISSISSIPPI VALLEY, INTERSECTING THE BOUNDARY THERE,
PRODUCING RAIN OVER THE AREA FROM EARLY SUNDAY INTO MONDAY. IN
ADDITION, MOISTURE FROM THE PACIFIC WILL STREAM INTO NORTHERN
CALIFORNIA, PRODUCING LIGHT RAIN ON SATURDAY, INCREASING TO HEAVY
RAIN ON SUNDAY. THEREFORE, THE WPC HAS ISSUED A MODERATE RISK
(LEVEL 3/4) OF EXCESSIVE RAINFALL OVER PARTS OF NORTHERN
CALIFORNIA ON SUNDAY INTO MONDAY MORNING. NUMEROUS FLASH FLOODING
EVENTS ARE POSSIBLE. IN ADDITION, MANY STREAMS MAY FLOOD,
POTENTIALLY AFFECTING LARGER RIVERS. THE FLOODING MAY INCLUDE
DEBRIS FLOWS IN OR NEAR RECENTLY BURNED AREAS. MOREOVER, RAIN AND
HIGHEST-ELEVATION SNOW WILL DEVELOP OVER PARTS OF THE GREAT BASIN,
THE CENTRAL ROCKIES, THE PACIFIC NORTHWEST, AND THE NORTHERN
INTERMOUNTAIN REGION THROUGH MONDAY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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