825
FXUS01 KWBC 181948
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
247 PM EST MON DEC 18 2023
VALID 00Z TUE DEC 19 2023 - 00Z THU DEC 21 2023
...THERE IS A MODERATE RISK OF EXCESSIVE RAINFALL OVER PARTS OF
NORTHERN NEW ENGLAND ON THROUGH TUESDAY MORNING...
...LAKE-EFFECT SNOW DOWNWIND OF THE GREAT LAKES AND UPSLOPE SNOW
OVER PARTS OF THE NORTHERN/CENTRAL APPALACHIANS...
..RAIN FOR MOST OF THE WEST COAST
THE STORM SYSTEM THAT BROUGHT SEVERAL INCHES OF RAIN UP THE
EASTERN SEABOARD CONTINUES TO IMPACT THE NORTHEAST TODAY WITH
WIDESPREAD HEAVY RAIN THAT RESULTED IN RIVER FLOODING, SCATTERED
TO WIDESPREAD AREAS WITH FLASH FLOODING WITH SOME AREAS
EXPERIENCING ROAD WASHOUTS. A MODERATE RISK FOR EXCESSIVE RAINFALL
IS IN EFFECT FOR MOST OF NEW HAMPSHIRE AND CENTRAL/SOUTHERN MAINE
THROUGH TUESDAY MORNING. A SLIGHT RISK SPANS FROM EASTERN NEW YORK
TO EASTERN MAINE WHILE A MARGINAL ENCOMPASSES THAT PART OF THE
REGION AND EXTENDS TO CENTRAL NEW YORK AND MOST OF NEW JERSEY.
THIS DEEP STORM WILL CONTINUE TO PRODUCE PERIODS OF HEAVY RAIN
OVER PARTS OF NEW ENGLAND AS IT PULLS CONTINUES TO TRACK OFFSHORE.
ADDITIONALLY, THE STORM WILL PRODUCE SHOWERS AND THUNDERSTORMS
OVER THE NORTHERN MID-ATLANTIC COAST/SOUTHERN NEW ENGLAND COAST.
THE THREAT OF HEAVY RAIN ENDS ON TUESDAY AS THE SYSTEM MOVES
FARTHER INTO CANADA.
IN THE WAKE OF THE DEEP STORM, UPPER-LEVEL ENERGY OVER THE GREAT
LAKES/OHIO VALLEY MOVES EASTWARD TO THE NORTHEAST COAST BY TUESDAY
EVENING. THE ENERGY AND COLD AIR WILL AID IN CREATING LAKE-EFFECT
SNOW DOWNWIND OF THE GREAT LAKES AND UPSLOPE SNOW OVER PARTS OF
THE NORTHERN/CENTRAL APPALACHIANS INTO WEDNESDAY. SOME OF THE
HIGHEST ACCUMULATIONS WILL FOCUS OVER PARTS OF THE CENTRAL
APPALACHIANS, SOUTHEAST FROM LAKE MICHIGAN IN MICHIGAN AND
INDIANA, AND ALONG THE CENTRAL AND EASTERN SHORE OF LAKE ERIE IN
OHIO AND NEW YORK STATE. THE LAKE-EFFECT SNOW WILL BE MUCH LIGHTER
ON TUESDAY AND END OVER THE UPPER GREAT LAKES.
A SERIES OF FRONTS USHERING IN PACIFIC MOISTURE WILL HELP PRODUCE
RAIN ACROSS THE PACIFIC NORTHWEST THROUGH THE MIDDLE OF THE WEEK.
LOCALLY HEAVY SNOW OVER THE HIGHEST ELEVATIONS OF THE SIERRA
NEVADA MOUNTAINS AND LIGHTER SNOW OVER THE HIGHEST ELEVATIONS OF
THE CASCADES AND PARTS OF IDAHO AND NEVADA WILL BE POSSIBLE. RAIN
MAY BE MODERATE TO HEAVY AT TIMES ALONG THE COAST AND POINTS
INLAND. THERE IS A MARGINAL RISK FOR EXCESSIVE RAINFALL AND
ISOLATE AREAS OF FLASH FLOODING TUESDAY FOR PARTS OF NORTHERN AND
CENTRAL CALIFORNIA AND FOR PARTS OF CENTRAL AND SOUTHERN
CALIFORNIA ON WEDNESDAY.
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