667
FXUS01 KWBC 081958
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
257 PM EST FRI DEC 08 2023
VALID 00Z SAT DEC 09 2023 - 00Z MON DEC 11 2023
..HEAVY SNOW FOR THE UPPER MIDWEST
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF THE
PACIFIC NORTHWEST ON SATURDAY AND OVER PARTS OF NEW ENGLAND ON
SUNDAY...
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE LOWER MISSISSIPPI VALLEY TO THE SOUTHERN OHIO AND TENNESSEE
VALLEYS ON SATURDAY...
A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE SOUTHERN HIGH
PLAINS WILL SLOWLY MOVE TO THE EASTERN SEABOARD BY SUNDAY EVENING.
SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF THE
FRONT OVER PARTS OF THE MIDDLE/LOWER MISSISSIPPI VALLEY AND THE
TENNESSEE VALLEY AND RAIN OVER PARTS OF THE GREAT LAKES/OHIO
VALLEY ON FRIDAY EVENING INTO SATURDAY MORNING.
ADDITIONALLY, HEAVY SNOW WILL DEVELOP OVER THE NORTHWEST PORTION
OF THE STORMS OVER PARTS OF THE NORTHERN PLAINS/UPPER MISSISSIPPI
VALLEY FROM FRIDAY EVENING INTO SATURDAY EVENING. HEAVY SNOW WILL
DEVELOP OVER PARTS OF THE UPPER GREAT LAKES FROM SATURDAY EVENING
INTO SUNDAY EVENING.
MOREOVER, AS THE BOUNDARY MOVES EASTWARD ON SATURDAY, SHOWERS AND
SEVERE THUNDERSTORMS WILL DEVELOP ALONG PARTS OF THE FRONT.
THEREFORE, THE SPC HAS ISSUED A SLIGHT RISK OF SEVERE
THUNDERSTORMS OVER PARTS OF THE LOWER MISSISSIPPI VALLEY TO THE
SOUTHERN OHIO AND TENNESSEE VALLEYS FROM SATURDAY THROUGH SUNDAY
MORNING. THE HAZARDS ASSOCIATED WITH THESE THUNDERSTORMS ARE
FREQUENT LIGHTNING, SEVERE THUNDERSTORM WIND GUSTS, HAIL, AND A
FEW TORNADOES.
ON SUNDAY, MOISTURE FROM THE GULF OF MEXICO WILL POOL ALONG THE
BOUNDARY, PRODUCING HEAVY RAIN OVER PARTS OF THE NORTHEAST.
THEREFORE, THE WPC ISSUED A SLIGHT RISK OF EXCESSIVE RAINFALL OVER
NEW ENGLAND ON SUNDAY. THE ASSOCIATED HEAVY RAIN WILL CREATE
MAINLY LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS, ROADS,
AND SMALL STREAMS THE MOST VULNERABLE. IN ADDITION, SHOWERS AND
THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF THE FRONT OVER PARTS
OF THE MID-ATLANTIC TO THE SOUTHEAST AND CENTRAL GULF COAST.
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN/CENTRAL ROCKIES
WILL PRODUCE SNOW OVER PARTS OF THE REGION THROUGH SATURDAY
EVENING. A FRONT WILL MOVE ONSHORE OVER THE PACIFIC NORTHWEST
SATURDAY EVENING INTO SUNDAY. AHEAD OF THE FRONT, A PLUME OF
MOISTURE WILL STREAM INTO THE NORTHWEST ON SATURDAY INTO SUNDAY.
THE MOISTURE STREAMING INLAND WILL PRODUCE RAIN AND HIGH-ELEVATION
SNOW OVER PARTS OF THE PACIFIC NORTHWEST THROUGH SUNDAY AND SNOW
OVER THE NORTHERN INTERMOUNTAIN REGION FROM SATURDAY EVENING INTO
SUNDAY. THE MOISTURE WILL ALSO PRODUCE HEAVY RAIN OVER PARTS OF
THE NORTHWEST ON SATURDAY. THEREFORE, THE WPC HAS ISSUED A SLIGHT
RISK OF EXCESSIVE RAINFALL OVER PARTS OF THE PACIFIC NORTHWEST
FROM SATURDAY INTO SUNDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL
CREATE MAINLY LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS,
ROADS, AND SMALL STREAMS THE MOST VULNERABLE.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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