546
FXUS01 KWBC 281820
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
120 PM EST THU NOV 28 2024
VALID 00Z FRI NOV 29 2024 - 00Z SUN DEC 01 2024
..HEAVY SNOWFALL IN NEW ENGLAND EXPECTED INTO FRIDAY MORNING
...LAKE EFFECT SNOWS CONTINUE AND WILL EXPAND AND INTENSIFY
GREATLY WITH TIME...
...THE COLDEST AIR MASS SINCE MID TO LATE FEBRUARY BECOMES
ENTRENCHED FOR MOST SPOTS EAST OF THE ROCKIES INTO THE WEEKEND...
A DYNAMIC MID-LATITUDE CYCLONE TRACKS NEAR THE NEW ENGLAND COAST
THURSDAY NIGHT BEFORE MOVING INTO ATLANTIC CANADA ON FRIDAY. A
SWATH OF MODERATE TO HEAVY SNOWFALL IS LIKELY TO DEVELOP ACROSS
PORTIONS OF THE INTERIOR NORTHEAST -- WINTER STORM WARNINGS ARE IN
EFFECT FROM EASTERN NEW YORK THROUGH CENTRAL AND NORTHERN NEW
ENGLAND WHERE OVER ONE FOOT OF FRESH SNOW IS POSSIBLE.
DISTURBANCES ALOFT WILL SEND REINFORCEMENTS TO THE COLD AIR MASS
EAST OF THE ROCKIES WITH A STRONG AND COLD SURFACE HIGH NOSING
INTO THE PLAINS. IT IS EXPECTED TO BE THE COLDEST AIR MASS SINCE
MID TO LATE FEBRUARY ACROSS THE NORTHERN PLAINS AND MIDWEST; WIND
CHILLS SHOULD FALL BELOW ZERO, PERHAPS AS LOW AS -40F IN NORTH
DAKOTA ON FRIDAY AND SATURDAY. DAILY RECORD COLD LOW AND HIGH
TEMPERATURES ARE POSSIBLE BETWEEN THE UPPER OHIO VALLEY AND
SOUTHERN APPALACHIANS FROM FRIDAY INTO MONDAY, WHERE THE COLD IS
MOST ANOMALOUS FOR LATE NOVEMBER AND EARLY DECEMBER. LAKE EFFECT
SNOWS, ONGOING ACROSS PORTIONS OF MICHIGAN, SHOULD EXPAND AND
INTENSIFY DOWNWIND OF ALL GREAT LAKES AS THE INCREASING COLD
WITHIN CYCLONIC LOW LEVEL FLOW INTERACTS WITH RECORD WARM GREAT
LAKES TEMPERATURES FOR LATE NOVEMBER. THUNDERSNOW IS POSSIBLE IN
SOME SPOTS. SNOWFALL TOTALS UP TO 3 INCHES IN AN HOUR ARE
POSSIBLE. THE SNOWFALL ACCUMULATIONS WILL BE SIGNIFICANT THROUGH
SATURDAY, UP TO 5 FEET OF SNOW IS FORECAST DOWNWIND OF LAKE
ONTARIO IN NORTHERN NEW YORK WHICH COULD RECEIVE A MOISTURE FETCH
OFF THREE OF THE GREAT LAKES. IN AND NEAR NORTHEAST MISSOURI AND
SOUTHERN ILLINOIS, A SEPARATE PATH OF SNOW IS EXPECTED TO FALL ON
SATURDAY TO LEAD TO MINOR IMPACTS FOR CITIES SUCH AS ST. LOUIS AND
EVANSVILLE, INDIANA. FLORIDA WILL REMAIN MILD TO WARM.
ROTH/KEDEBE
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