481
FXUS01 KWBC 050716
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
216 AM EST TUE DEC 05 2023
VALID 12Z TUE DEC 05 2023 - 12Z THU DEC 07 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 STRONG ATMOSPHERIC RIVER IMPACTING THE PACIFIC NORTHWEST IS
EXPECTED TO CONTINUE SOAKING THE REGION WITH HEAVY RAIN THROUGH
WEDNESDAY UNTIL PRECIPITATION BECOMES SCATTERED. 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 ADDITIONAL
INCHES OF RAIN ARE FORECAST ACROSS WESTERN OREGON AND WASHINGTON,
AS WELL AS NORTHERN IDAHO BY MIDWEEK. FLOOD WATCHES, WARNINGS, AND
ADVISORIES HAVE BEEN ISSUED FOR THIS PART OF THE COUNTRY.
RESIDENTS ARE ADVISED TO NEVER DRIVE THROUGH FLOODED ROADWAYS AND
HAVE A PLAN IF WITHIN AN AREA THAT TYPICALLY FLOODS. BY WEDNESDAY
NIGHT INTO THURSDAY, MUCH OF THE PRECIPITATION SHOULD FINALLY
BEGIN TO WEAKEN AND SHIFT 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. SNOW WILL
BE MOSTLY SCATTERED AND LIGHT, EXCEPT FOR THE ALLEGHENY FRONT OF
WEST VIRGINIA AND WESTERN MARYLAND. HERE, SUBFREEZING TEMPERATURES
AND UPSLOPE FLOW FROM THE NORTHWEST WILL ALLOW FOR MODERATE TO
LOCALLY HEAVY SNOW ACROSS THE HIGH 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.
THE REST OF THE CONUS CAN ANTICIPATE DRY CONDITIONS AS HIGH
PRESSURE ANCHORS OVERHEAD. TEMPERATURES ARE FORECAST TO REMAIN
SLIGHTLY BELOW AVERAGE ALONG THE EAST COAST AND SOUTHEAST, WHILE A
WARMING TREND KICKS OFF ACROSS THE CENTRAL UNITED STATES. HIGHS ON
WEDNESDAY AND THURSDAY SHOULD REACH THE 60S IN THE CENTRAL PLAINS
AND 70S IN THE SOUTHERN PLAINS, WITH TEMPERATURES ANOMALIES OF 20
TO 30 DEGREES ABOVE 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.
SNELL
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