738
FXUS01 KWBC 301925
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
225 PM EST SAT NOV 30 2024
VALID 00Z SUN DEC 01 2024 - 00Z TUE DEC 03 2024
...BIG TEMPERATURE DIFFERENCES ACROSS THE LOWER 48 WITH ABOVE
AVERAGE TEMPERATURES FROM THE WEST COAST INTO THE ROCKIES, WHILE
BELOW AVERAGE TEMPERATURES STRETCH FROM THE NORTHERN PLAINS TO THE
EAST COAST...
...ACTIVE LAKE EFFECT SNOWS TO CONTINUE DOWNWIND OF THE GREAT
LAKES OVER THE NEXT FEW DAYS...
...POOR AIR QUALITY EXPECTED FROM THE INTERIOR CALIFORNIA VALLEY
INTO THE PACIFIC NORTHWEST AND NORTHERN GREAT BASIN...
...MUCH OF THE LOWER 48 WILL BE DRY OVER THE NEXT FEW DAYS, SAVE
FOR DOWNWIND OF THE GREAT LAKES AND ACROSS FAR SOUTH TEXAS...
THE MID TO UPPER LEVEL FLOW ACROSS NORTH AMERICA IS EXPECTED TO
REMAIN AMPLIFIED OVER THE NEXT FEW DAYS, COMPRISED OF A MEAN TROF
FROM EASTERN CANADA, SOUTH INTO THE EASTERN U.S., WHILE AN
AMPLIFIED RIDGE STRETCHES FROM WESTERN CANADA INTO THE PACIFIC
NORTHWEST AND THE GREAT BASIN. THIS FLOW PATTERN WILL KEEP
TEMPERATURES BELOW AVERAGE FROM THE NORTHERN PLAINS, SOUTHEAST
THROUGH THE MISSISSIPPI VALLEY AND ACROSS ALL OF THE EAST. HIGH
TEMPERATURES EXPECTED TO BE 10 TO 20 DEGREES BELOW AVERAGE SUNDAY
AND MONDAY FROM THE NORTHERN PLAINS INTO THE OHIO VALLEY, WITH THE
10 TO 20 DEGREE BELOW AVERAGE TEMPERATURES SPREADING FARTHER
SOUTHEAST ALONG MUCH OF THE EAST COAST BY MONDAY. IN CONTRAST,
ABOVE AVERAGE TEMPERATURES ARE ON TAP FROM THE WEST COAST INTO THE
GREAT BASIN, SOUTHWEST, ROCKIES AND THE CENTRAL TO SOUTHERN HIGH
PLAINS, WITH HIGHS OVER THE NEXT TWO DAYS 10 TO 15 DEGREES ABOVE
AVERAGE.
THE COLD AIR STREAMING ACROSS THE RELATIVELY WARM GREAT LAKES WILL
KEEP LAKE EFFECT SNOWS VERY ACTIVE OVER THE NEXT FEW DAYS. THE
HEAVIEST SNOW TOTALS ARE EXPECTED DOWNWIND OF LAKES ERIE AND
ONTARIO, AFFECTING AREAS FROM NORTHEAST OHIO, FAR NORTHWEST
PENNSYLVANIA, WESTERN NEW YORK STATE AND PORTIONS OF NORTHWEST NEW
YORK STATE. COLD AIR BLOWING ALONG THE LONG AXES OF LAKES ERIE
AND ONTARIO HAVE PRODUCED INTENSE SINGLE BANDED SNOW SQUALLS THAT
HAVE ALREADY PRODUCED 1 TO 1.5 FEET OF SNOW. THIS FAVORABLE LOW
LEVEL FLOW OFF OF ERIE AND ONTARIO WILL CONTINUE THROUGH SUNDAY,
BRINGING THE POTENTIAL FOR ADDITIONAL SNOW TOTALS OF 1 TO 3 FEET
ACROSS AREAS THAT HAVE ALREADY SEEN VERY HEAVY TOTALS. LAKE
EFFECT SNOWS WILL ALSO BE ACTIVE DOWNWIND OF LAKE SUPERIOR AND
MICHIGAN, WITH SNOW TOTALS IN EXCESS OF A FOOT POSSIBLE ACROSS THE
UPPER PENINSULA OF MICHIGAN AND THE LOWER PENINSULA OF MICHIGAN
ALONG THE LAKE MICHIGAN SHORELINE.
WHILE LARGE SECTIONS OF THE WEST ARE EXPECTED TO SEE ABOVE AVERAGE
TEMPERATURES OVER THE NEXT FEW DAYS, SOME OF THE VALLEY LOCATIONS
FROM THE INTERIOR OR CALIFORNIA INTO THE PACIFIC NORTHWEST AND
NORTHERN GREAT BASIN WILL SEE COOLER TEMPERATURE. THESE LOCATIONS
WILL BE PRONE TO STAGNANT AIR CONDITIONS, LEADING TO AREAS OF
DENSE FOG AND POOR AIR QUALITY.
MUCH OF THE LOWER 48 WILL BE DRY OVER THE NEXT FEW DAYS, WITH THE
EXCEPTIONS BEING DOWNWIND OF THE GREAT LAKES INTO THE UPSLOPE OF
THE CENTRAL APPALACHIANS AND OVER FAR SOUTH TEXAS. THIS WILL
BRING NO ADDITIONAL RELIEF TO THE WIDESPREAD DROUGHT CONDITIONS
AFFECTING LARGE PORTIONS OF THE LOWER 48.
ORAVEC
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