874
FXUS01 KWBC 131946
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
246 PM EST FRI DEC 13 2024
VALID 00Z SAT DEC 14 2024 - 00Z MON DEC 16 2024
...HEAVY SNOW OVER THE SIERRA NEVADA MOUNTAINS, HIGHEST PEAKS OF
THE CASCADES, AND THE NORTHERN INTERMOUNTAIN REGION ON FRIDAY
EVENING INTO SATURDAY; HEAVY SNOW OVER PARTS OF THE NORTHERN
ROCKIES ON SATURDAY EVENING INTO SUNDAY...
...0.10 INCHES OF RAIN/FREEZING RAIN OVER PARTS OF THE MIDDLE
MISSISSIPPI VALLEY ON FRIDAY EVENING INTO SATURDAY AND THE
NORTHERN HIGH PLAINS/CENTRAL APPALACHIANS ON SATURDAY EVENING INTO
SUNDAY...
...PATCHY RAIN/FREEZING RAIN OVER PARTS OF THE UPPER MISSISSIPPI
VALLEY AND GREAT LAKES ON SATURDAY EVENING INTO SUNDAY...
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF
NORTHERN CALIFORNIA...
A FRONT EXTENDING FROM THE CENTRAL PLAINS TO THE SOUTHERN HIGH
PLAINS WILL MOVE EASTWARD AND DISSIPATE BY SUNDAY, WHILE THE
ASSOCIATED UPPER-LEVEL ENERGY MOVES INTO THE GREAT LAKES/OHIO
VALLEY. RETURN FLOW OFF THE GULF OF MEXICO WILL START TO STREAM
NORTHWARD OVER PARTS OF THE SOUTHERN PLAINS, PRODUCING SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE SOUTHERN PLAINS AND MIDDLE/LOWER
MISSISSIPPI VALLEY OVERNIGHT FRIDAY INTO SATURDAY. IN ADDITION,
RAIN WILL MOVE INTO THE OHIO AND TENNESSEE VALLEYS ON SATURDAY
EVENING INTO SUNDAY.
ADDITIONALLY, OVERNIGHT FRIDAY, AS THE MOISTURE STREAMS FARTHER
NORTHWARD OVER THE MISSISSIPPI VALLEY, RAIN/FREEZING RAIN WILL
DEVELOP OVER PARTS OF THE MIDDLE MISSISSIPPI VALLEY. LIGHT SNOW
WILL DEVELOP SLIGHTLY FARTHER NORTH OVER PARTS OF THE UPPER
MISSISSIPPI VALLEY. OVERNIGHT SATURDAY INTO SUNDAY, RAIN/FREEZING
RAIN WILL DEVELOP OVER PARTS OF THE CENTRAL APPALACHIANS. RAIN
WILL ALSO MOVE INTO PARTS OF THE MID-ATLANTIC ON SUNDAY.
FURTHERMORE, EASTERLY FLOW OFF THE ATLANTIC WILL AID IN PRODUCING
LIGHT RAIN FROM THE SOUTHERN MID-ATLANTIC COAST TO THE FLORIDA
COAST ON SATURDAY INTO SUNDAY.
MEANWHILE, A FRONT MOVING ONSHORE OVER THE PACIFIC
NORTHWEST/NORTHERN CALIFORNIA WILL MOVE EASTWARD TO THE
NORTHERN/CENTRAL PLAINS AND SOUTHERN HIGH PLAINS BY SUNDAY. THE
SYSTEM WILL PRODUCE RAIN AND HIGHER-ELEVATION SNOW OVER THE
PACIFIC NORTHWEST AND NORTHERN CALIFORNIA OVERNIGHT FRIDAY. THE
RAIN AND HIGHER-ELEVATION SNOW WILL EXPAND INTO CENTRAL CALIFORNIA
AND THE NORTHERN INTERMOUNTAIN REGION ON SATURDAY. THE SNOW WILL
BE HEAVY OVER THE SIERRA NEVADA MOUNTAINS, THE HIGHEST PEAKS OF
THE CASCADES, AND THE NORTHERN INTERMOUNTAIN REGION ON FRIDAY
EVENING INTO SATURDAY.
MOREOVER, MOISTURE STREAMING ONSHORE OVER NORTHERN CALIFORNIA WILL
PRODUCE HEAVY RAIN OVER PARTS OF THE STATE. THEREFORE, THE WPC HAS
ISSUED A SLIGHT RISK (LEVEL 2/4) OF EXCESSIVE RAINFALL THROUGH
SATURDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE MAINLY
LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS, ROADS, SMALL
STREAMS, AND LOW-LYING AREAS THE MOST VULNERABLE, AS WELL AS
LANDSLIDES ON ROADS.
LIKEWISE, MOISTURE WILL CONTINUE TO FLOW INTO NORTHERN CALIFORNIA,
PRODUCING HEAVY RAIN. THEREFORE, THE WPC HAS ISSUED A SLIGHT RISK
(LEVEL 2/4) OF EXCESSIVE RAINFALL FROM SATURDAY THROUGH SUNDAY
MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE MAINLY LOCALIZED
AREAS OF FLASH FLOODING, WITH URBAN AREAS, ROADS, SMALL STREAMS,
AND LOW-LYING AREAS THE MOST VULNERABLE, AS WELL AS LANDSLIDES ON
ROADS.
OVERNIGHT SATURDAY INTO SUNDAY, HEAVY SNOW WILL DEVELOP OVER
PARTS OF THE NORTHERN ROCKIES AS THE FRONT MOVES INTO THE NORTHERN
HIGH PLAINS. FURTHER, RAIN/FREEZING RAIN WILL DEVELOP OVER PARTS
OF THE NORTHERN HIGH PLAINS. BY SUNDAY EVENING, THERE WILL BE A
BREAK IN THE PRECIPITATION OVER THE PACIFIC NORTHWEST/NORTHERN
CALIFORNIA.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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