494
FXUS01 KWBC 040753
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
252 AM EST WED DEC 04 2024
VALID 12Z WED DEC 04 2024 - 12Z FRI DEC 06 2024
...HEAVY SNOW FOR THE UPPER PENINSULA OF MICHIGAN AND THE NORTHERN
LOWER PENINSULA ON WEDNESDAY...
...HEAVY LAKE-ENHANCED SNOW DOWNWIND FROM LAKES ERIE AND ONTARIO
ON WEDNESDAY AND THURSDAY; HEAVY SNOW OVER PARTS OF NORTHERN NEW
ENGLAND; LIGHT TO MODERATE SNOW OVER PARTS OF THE CENTRAL
APPALACHIANS ON WEDNESDAY...
...TEMPERATURES WILL BE 10 TO 15 DEGREES BELOW AVERAGE OVER PARTS
OF THE MID-ATLANTIC AND THE SOUTHEAST...
ON WEDNESDAY, HIGH PRESSURE OVER THE SOUTHEAST WILL MOVE
SOUTHEASTWARD OFF THE SOUTHEAST COAST BY WEDNESDAY NIGHT. THE HIGH
PRESSURE WILL CREATE COLD TEMPERATURES OVER PARTS OF THE
MID-ATLANTIC AND THE SOUTHEAST, BRINGING TEMPERATURES OF 10 TO 15
DEGREES BELOW AVERAGE.
MEANWHILE, LOW PRESSURE JUST NORTH OF LAKE SUPERIOR WILL MOVE
EASTWARD TO SOUTHEAST CANADA BY FRIDAY. THE STORM WILL PRODUCE
HEAVY SNOW OVER THE UPPER PENINSULA OF MICHIGAN AND THE NORTHERN
LOWER PENINSULA OF MICHIGAN THROUGH THURSDAY MORNING. MOREOVER,
HEAVY LAKE-ENHANCED SNOW WILL DEVELOP DOWNWIND OF LAKES ERIE AND
ONTARIO THROUGH FRIDAY. ADDITIONALLY, HEAVY SNOW WILL DEVELOP OVER
NEW ENGLAND THROUGH FRIDAY TOO.
FURTHERMORE, LIGHT SNOW WILL DEVELOP OVER PARTS OF THE NORTHERN
PLAINS/UPPER MISSISSIPPI VALLEY AND THE OHIO VALLEY FROM WEDNESDAY
THROUGH FRIDAY. MODERATE TO HEAVY SNOW WILL DEVELOP OVER PARTS OF
THE CENTRAL APPALACHIANS THROUGH FRIDAY. RAIN WILL ALSO DEVELOP
OVER THE COASTAL PARTS OF NEW ENGLAND THROUGH THURSDAY AFTERNOON
AND THEN CHANGE OVER TO SNOW.
MOREOVER, WEAK RETURN FLOW OFF THE GULF OF MEXICO WILL CREATE
SCATTERED SHOWERS AND THUNDERSTORMS OVER PARTS OF THE WEST/CENTRAL
GULF COAST THROUGH WEDNESDAY AND THURSDAY. SOME OF THE RAIN WILL
BE MODERATE TO HEAVY OVER PARTS OF THE WESTERN GULF COAST.
THEREFORE, THE WPC HAS ISSUED A MARGINAL RISK (LEVEL 1/4) OF
EXCESSIVE RAINFALL OVER PARTS OF THE WESTERN GULF COAST THROUGH
THURSDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE LOCALIZED
AREAS OF FLASH FLOODING, AFFECTING AREAS THAT EXPERIENCE RAPID
RUNOFF WITH HEAVY RAIN.
RAIN WILL ALSO EXPAND ALONG THE EASTERN GULF COAST INTO THE
SOUTHEAST ON THURSDAY AND INTO PARTS OF THE SOUTHERN HIGH PLAINS
THURSDAY NIGHT INTO FRIDAY.
ELSEWHERE, UPPER-LEVEL RIDGING WILL CREATE STAGNANT AIR CONDITIONS
OVER PARTS OF THE PACIFIC NORTHWEST, LEADING TO AREAS OF DENSE FOG
AND POOR AIR QUALITY. HOWEVER, AN APPROACHING FRONT OVER THE
EASTERN PACIFIC WILL USHER MOISTURE INTO THE PACIFIC NORTHWEST,
CREATING LIGHT RAIN OVER PARTS OF THE NORTHWEST COAST LATE
WEDNESDAY NIGHT INTO FRIDAY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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