405
FXUS01 KWBC 062001
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EST WED DEC 06 2023
VALID 00Z THU DEC 07 2023 - 00Z SAT DEC 09 2023
...EXCESSIVE RAINFALL AND FLOODING POTENTIAL CONTINUES ACROSS THE
PACIFIC NORTHWEST INTO THURSDAY MORNING...
...MODERATE UPSLOPE SNOW FORECAST ACROSS THE CENTRAL AND SOUTHERN
APPALACHIANS THROUGH WEDNESDAY NIGHT...
...WELL ABOVE AVERAGE AND POTENTIALLY RECORD-BREAKING WARMTH
FORECAST ACROSS THE CENTRAL UNITED STATES OVER THE NEXT FEW DAYS...
SEVERAL INCHES OF RAIN HAS FALLEN OVER MULTIPLE DAYS ACROSS THE
PACIFIC NORTHWEST WHICH HAS RESULTED IN SCATTERED AREAS OF
FLOODING. THIS WATER LOGGED AREA WILL SEE SOME RELIEF AS
PRECIPITATION WEAKENS AND REDUCES COVERAGE BY THE WEEK'S END. WPC
IS MAINTAINING A MARGINAL RISK FOR EXCESSIVE RAINFALL FOR THE
PACIFIC NORTHWEST/NORTHERN CALIFORNIA COAST AND NORTHERN
IDAHO/NORTHWEST WASHINGTON THROUGH THURSDAY MORNING. ADDITIONALLY,
NUMEROUS FLOOD WATCHES, WARNINGS, AND ADVISORIES REMAIN IN EFFECT.
WITH COLDER AIR FILTRATING INTO THE REGION SNOW LEVELS ARE
EXPECTED TO DROP TO AROUND 4000 FEET WHICH WILL REDUCE TO NEGATE
SNOWMELT/RUNOFF POTENTIAL FROM AREAS OF HIGHER TERRAIN AS THE NEXT
WAVE OF MODERATE PRECIPITATION ENTERS THE REGION.
WITH COLD AIR SURGING INTO THE EASTERN U.S. WITH A DEVELOPING LOW
PRESSURE SYSTEM IN THE WESTERN ATLANTIC SNOW SHOWERS AND LIGHT
ACCUMULATIONS ARE POSSIBLE FOR THE APPALACHIANS, GREAT LAKES, AND
NORTHEAST THROUGH THURSDAY. SOME OF THE GREATEST ACCUMULATIONS MAY
BE OBSERVED ALONG THE HIGHER TERRAIN OF THE CENTRAL AND SOUTHERN
APPALACHIANS THROUGH THE OVERNIGHT HOURS. WINTER WEATHER
ADVISORIES EXTEND FROM THE MOUNTAINOUS TERRAIN OF WESTERN NORTH
CAROLINA TO THE ALLEGHENY FRONT OF WEST VIRGINIA AND WESTERN
MARYLAND FOR 3 TO 6 INCHES OF SNOW.
MEANWHILE A VAST PORTION OF THE CENTRAL U.S. WILL BE WARMER AND
DRIER THROUGH FRIDAY BEFORE A LOW PRESSURE SYSTEM AND ASSOCIATED
COLD FRONT ADVANCES THROUGH THE GREAT PLAINS. DAILY MAXIMUMS WILL
CLIMB INTO THE 60S ACROSS SOUTH DAKOTA WITH 70S ACROSS KANSAS.
THESE VALUES ARE AROUND 20 TO 30 DEGREES ABOVE AVERAGE WHEN
COMPARED TO EARLY DECEMBER CLIMATOLOGY. THE WARMEST DAY WILL BE
THURSDAY, WHERE SEVERAL DAILY HIGH TEMPERATURE RECORDS COULD BE
BROKEN THROUGHOUT THE GREAT PLAINS AND UPPER MIDWEST. MEANWHILE,
AS THE AFOREMENTIONED COLD FRONT SWINGS THROUGH THE ROCKIES ON
THURSDAY AND APPROACHES THE PLAINS ON FRIDAY, UNSETTLED WEATHER
AND GUSTY WINDS ARE SET TO RETURN. MODERATE TO LOCALLY HEAVY SNOW
IS POSSIBLE ACROSS THE MOUNTAINOUS TERRAIN OF THE ROCKIES, AS WELL
AS INTO THE CENTRAL HIGH PLAINS ON FRIDAY. STRONG WESTERLY AND
DOWNSLOPING WINDS MAY ALSO PROVE TO BE HAZARDOUS ACROSS THE
NORTHERN AND CENTRAL HIGH PLAINS FOR THE END OF THE WEEK.
CAMPBELL
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