063
FXUS01 KWBC 051948
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
247 PM EST TUE DEC 05 2023
VALID 00Z WED DEC 06 2023 - 00Z FRI DEC 08 2023
...EXCESSIVE RAINFALL AND FLOODING POTENTIAL CONTINUES ACROSS THE
PACIFIC NORTHWEST OVER THE NEXT FEW DAYS...
...MODERATE UPSLOPE SNOW FORECAST ACROSS THE CENTRAL APPALACHIANS
INTO WEDNESDAY...
...WARMING TREND INCREASES ACROSS THE GREAT PLAINS THROUGH
MIDWEEK...
A ROBUST ATMOSPHERIC RIVER WILL CONTINUE TO DUMP OVERLY ABUNDANT
MOISTURE ACROSS THE PACIFIC NORTHWEST WHICH IN TURN WILL KEEP THE
THREAT FOR EXCESSIVE RAINFALL AND FLOODING ELEVATED THROUGH
THURSDAY. WARM AIR ASSOCIATED WITH THE STREAM OF MOISTURE
EXTENDING FROM THE SUBTROPICAL PACIFIC WILL CONTINUE TO ALLOW FOR
VERY HIGH SNOW LEVELS THROUGH EARLY WEDNESDAY, WHICH WILL
EXACERBATE THE FLOODING POTENTIAL DUE TO SNOWMELT AND INCREASED
RUNOFF. SEVERAL INCHES OF RAINFALL ARE FORECAST OVER THE NEXT
COUPLE OF DAYS FOR WASHINGTON, OREGON AND NORTHERN IDAHO. NUMEROUS
FLOOD WATCHES, WARNINGS AND ADVISORIES ARE IN EFFECT ALONG THE
WASHINGTON, OREGON, NORTHERN CALIFORNIA COASTLINE, CENTRAL AND
EASTERN WASHINGTON AND OREGON, AND PORTIONS OF NORTHERN IDAHO AND
FAR NORTHWEST MONTANA. THE MAJORITY OF THE PRECIPITATION WILL
DECREASE BY WEDNESDAY NIGHT INTO THURSDAY,AS IT SHIFTS EASTWARD
THROUGHOUT THE NORTHERN GREAT BASIN AND NORTHERN ROCKIES, WHICH
WILL ALLOW FOR HEAVY MOUNTAIN SNOW FOR MANY OF THE ELEVATED RANGES.
AN ALBERTA CLIPPER SYSTEM CONTINUING ITS TREK ACROSS THE NATION
WILL ALSO PRODUCE AREAS OF SNOW FROM THE OHIO VALLEY AND LOWER
GREAT LAKES TO THE CENTRAL APPALACHIANS INTO WEDNESDAY. IN GENERAL
THE SNOW IS EXPECTED TO BE MOSTLY SCATTERED WITH LIGHT
ACCUMULATIONS; HOWEVER, PORTIONS OF THE ALLEGHENY RANGE IN WESTERN
MARYLAND AND WEST VIRGINIA WILL HAVE UPSLOPE FLOW TO ENHANCE SNOW
ACROSS THE HIGHER TERRAIN. WINTER WEATHER ADVISORIES HAVE BEEN
ISSUED FOR THE REGION FORECAST TO RECEIVE AT LEAST 3 INCHES OF
SNOWFALL. ELSEWHERE, LIGHT SNOW SHOWERS ARE POSSIBLE ACROSS NEW
ENGLAND AND LIGHT LAKE EFFECT SNOW IS POSSIBLE DOWNWIND OF THE
GREAT LAKES THROUGH MIDWEEK.
ELSEWHERE STABLE AND MOSTLY DRY CONDITIONS ARE EXPECTED WITH HIGH
PRESSURE ANCHORED IN PLACE. DAILY HIGHS ARE EXPECTED TO REMAIN
SLIGHTLY BELOW AVERAGE ALONG THE EAST COAST AND SOUTHEAST, WHILE A
WARMING TREND KICKS OFF ACROSS THE CENTRAL UNITED STATES. BY
WEDNESDAY AND THURSDAY 60S WILL BE FELT ACROSS THE CENTRAL STATES
AND EVEN 70S IN THE SOUTHERN PLAINS. THESE TEMPERATURES WILL BE 20
TO 20 DEGREES WARMER THAN SEASONAL AVERAGE EXTENDING INTO THE
MIDDLE MISSOURI VALLEY. DAILY HIGH TEMPERATURE RECORDS WILL BE AT
RISK OF BEING TIED/BROKEN FROM NEBRASKA TO WISCONSIN ON THURSDAY.
CAMPBELL/SNELL
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