797
FXUS01 KWBC 012004
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EST SUN DEC 01 2024
VALID 00Z MON DEC 02 2024 - 00Z WED DEC 04 2024
...MORE HEAVY LAKE-EFFECT SNOW EXPECTED THROUGH THE NEXT COUPLE OF
DAYS ACROSS THE GREAT LAKES...
...A REINFORCING SHOT OF POLAR AIR FROM CANADA WILL BRING A PERIOD
OF LIGHT SNOW FROM THE NORTHERN PLAINS TO THE SOUTHERN
APPALACHIANS FOLLOWED BY COLDER TEMPERATURES THROUGH THE NEXT
COUPLE OF DAYS...
...SHOWERS AND THUNDERSTORMS WILL BE EDGING CLOSER TOWARD THE
LOWER TEXAS COAST THROUGH THE NEXT COUPLE OF DAYS...
...TEMPERATURES WILL BE 10 TO 15 DEGREES BELOW AVERAGE OVER PARTS
OF THE NORTHERN PLAINS TO THE OHIO VALLEY, INTO THE MID-ATLANTIC
AND THE SOUTHEAST...
A SYNOPTIC PATTERN THAT FAVORS BROAD UPPER-LEVEL TROUGHING IN
NORTH AMERICA WILL CONTINUE TO PERIODICALLY USHER POLAR AIR FROM
CANADA INTO THE EASTERN TWO-THIRDS OF THE COUNTRY WHILE RELATIVELY
MILD AND DRY WEATHER PERSISTS ACROSS THE WESTERN U.S. THE LEADING
EDGE OF THE NEXT SURGE POLAR AIR IS CURRENTLY DIPPING INTO THE
NORTHERN HIGH PLAINS. A PERIOD OF LIGHT SNOW IS EXPECTED TO
SPREAD FROM THE NORTHERN PLAINS, ACROSS THE MIDWEST, OHIO VALLEY
AND THEN INTO THE SOUTHERN APPALACHIANS AHEAD OF A WAVE OF LOW
PRESSURE FORMING ALONG THE COLD FRONT. AN ARCTIC HIGH PRESSURE
SYSTEM BEHIND THE FRONT WILL USHER COLDER AIR INTO THESE AREAS,
BRINGING TEMPERATURES OF 10 TO 15 DEGREES BELOW AVERAGE. IN THE
MEAN TIME, LIGHT SNOW ACROSS THE CENTRAL AND SOUTHERN APPALACHIANS
IS EXPECTED TO TAPER OFF INTO TONIGHT.
AS THE RELATIVELY COLD AIR FLOWS OVER THE RELATIVELY WARM WATERS
OF THE GREAT LAKES, MORE LAKE-EFFECT SNOW CAN BE EXPECTED ACROSS
THE GREAT LAKES, ALTHOUGH THEY SHOULD BE LESS ACTIVE FOR PARTS OF
THE RECENTLY HARDER-HIT LOCATIONS AS THE WIND DIRECTION TURNS MORE
SOUTHWESTERLY. LOCALLY A COUPLE OF FEET OF NEW SNOW IS POSSIBLE
DOWNWIND FROM LAKE MICHIGAN AND LAKE ERIE THROUGH THE NEXT COUPLE
OF DAYS.
MEANWHILE, MOISTURE HAS BEEN GRADUALLY GATHERING IN THE WESTERN
GULF OF MEXICO TO THE SOUTH OF TEXAS ALONG A CONVERGENCE ZONE
WHERE A LOW PRESSURE WAVE IS FORECAST TO FORM OVER THE NEXT COUPLE
OF DAYS. AS THE WAVE BEGINS TO INTERACT WITH COLDER AIR FILTERING
FROM THE NORTH, SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED
TO GRADUALLY EXPAND AND EDGE TOWARD THE LOWER TEXAS COAST AND INTO
SOUTHERN TEXAS THROUGH TUESDAY. ELSEWHERE, UPPER-LEVEL RIDGING
OVER THE WESTERN U.S. WILL CREATE STAGNANT AIR CONDITIONS OVER THE
VALLEY LOCATIONS FROM INTERIOR CALIFORNIA INTO THE PACIFIC
NORTHWEST, LEADING TO AREAS OF DENSE FOG AND POOR AIR QUALITY.
KONG
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