045
FXUS01 KWBC 182002
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
302 PM EST WED DEC 18 2024
VALID 00Z THU DEC 19 2024 - 00Z SAT DEC 21 2024
...HEAVY SNOW OVER THE NORTHERN PLAINS, UPPER MISSISSIPPI VALLEY,
AND UPPER GREAT LAKES; PATCHY RAIN/FREEZING RAIN OVER PARTS OF THE
NORTHERN PLAINS AND CENTRAL APPALACHIANS OVERNIGHT WEDNESDAY...
...LIGHT TO MODERATE SNOW OVER PARTS OF THE NORTHEAST ON WEDNESDAY
NIGHT INTO FRIDAY; LIGHT SNOW OVER PARTS OF THE CENTRAL
APPALACHIANS ON FRIDAY...
...THERE IS AN ELEVATED RISK OF FIRE WEATHER OVER PARTS OF
SOUTHERN CALIFORNIA DUE TO SANTA ANA WIND...
A FRONT EXTENDING FROM THE MID-ATLANTIC TO THE CENTRAL GULF COAST
WILL MOVE EASTWARD OFF MOST OF THE EASTERN SEABOARD WHILE THE PART
OF THE BOUNDARY LINGERS OVER FLORIDA THROUGH FRIDAY MORNING. THE
SYSTEM WILL PRODUCE SHOWERS AND THUNDERSTORMS OVER PARTS OF THE
CENTRAL GULF COAST/TENNESSEE VALLEY TO THE SOUTHERN MID-ATLANTIC
AND SOUTHEAST THROUGH THURSDAY MORNING. LIKEWISE, THE STORM WILL
PRODUCE RAIN OVER PARTS OF THE CENTRAL APPALACHIANS/NORTHERN
MID-ATLANTIC INTO COASTAL NEW ENGLAND ALSO THROUGH THURSDAY
MORNING. IN ADDITION, THE SYSTEM WILL PRODUCE LIGHT TO MODERATE
SNOW OVER THE NORTHEAST THAT WILL TAPER OFF THE LAKE-EFFECT SNOW
AND END BY THURSDAY AFTERNOON. WITH LIGHT SNOW EXTENDING INTO
PARTS OF THE CENTRAL APPALACHIANS, ALONG THE RAIN-SNOW LINE,
PATCHY AREAS OF LIGHT RAIN/FREEZING RAIN WILL DEVELOP OVERNIGHT
WEDNESDAY INTO THURSDAY MORNING.
ON WEDNESDAY EVENING, A SECOND FRONT OVER THE NORTHERN HIGH PLAINS
WILL MOVE SOUTH AND EASTWARD TO THE MID-ATLANTIC/SOUTHEAST AND THE
GULF COAST STATES BY FRIDAY EVENING. THE STORM WILL PRODUCE RAIN
AND SNOW OVER THE PARTS OF THE NORTHERN ROCKIES INTO PARTS OF THE
NORTHERN HIGH PLAINS. PATCHY AREAS OF LIGHT RAIN/FREEZING RAIN
WILL DEVELOP ALONG THE RAIN-SNOW LINE OVER PARTS OF THE NORTHERN
HIGH PLAINS/NORTHERN PLAINS OVERNIGHT WEDNESDAY INTO THURSDAY
MORNING. MOREOVER, HEAVY SNOW WILL DEVELOP OVER PARTS OF THE
NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY AND UPPER GREAT LAKES
OVERNIGHT WEDNESDAY INTO THURSDAY. AS THE ASSOCIATED AREA OF
LOW-PRESSURE MOVES ACROSS THE GREAT LAKES/OHIO VALLEY, LIGHT TO
MODERATE SNOW WILL DEVELOP OVER THE AREAS THROUGH FRIDAY.
ADDITIONALLY, ON FRIDAY, A NORTHEAST WIND WILL CREATE MODERATE TO
HEAVY LAKE-ENHANCED SNOW OVER PARTS OF THE NORTHEASTERN COAST OF
THE LOWER PENINSULA OF MICHIGAN. MOREOVER, LIGHT SNOW WILL MOVE
INTO PARTS OF THE NORTHEAST AND CENTRAL APPALACHIANS. RAIN WILL
ALSO RETURN TO PARTS OF THE MID-ATLANTIC.
MEANWHILE, STRONG HIGH PRESSURE OVER THE GREAT BASIN AND A
WEAKNESS IN LOW PRESSURE OFF THE SOUTHERN CALIFORNIA COAST WILL
CREATE A STRONG SANTA ANA WIND. LOW RELATIVE HUMIDITY, DRY FUELS,
AND STRONG GUSTY WIND HAVE PROMPTED AN ELEVATED RISK OF FIRE
WEATHER OVER PARTS OF SOUTHERN CALIFORNIA. MOREOVER, A FRONT OVER
THE EASTERN PACIFIC WILL MOVE EASTWARD TOWARDS THE NORTHWEST
COAST. HOWEVER, THE BOUNDARY WILL DISSIPATE BY THURSDAY AFTERNOON.
LIGHT RAIN WILL DEVELOP OVER PARTS OF THE NORTHWEST COAST ON
THURSDAY. ANOTHER BOUNDARY WILL APPROACH THE PACIFIC NORTHWEST BY
FRIDAY. THE FRONT WILL BRING ANOTHER ROUND OF LIGHT RAIN TO THE
PACIFIC NORTHWEST COAST.
ZIEGENFELDER
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