784
FXUS01 KWBC 211957
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
256 PM EST SAT DEC 21 2024
VALID 00Z SUN DEC 22 2024 - 00Z TUE DEC 24 2024
....LIGHT TO MODERATE SNOW, WITH LOCALLY HIGHER AMOUNTS, WILL
DEVELOP OVER PARTS OF THE GREAT LAKES; LIGHT TO MODERATE SNOW OVER
THE HIGHER ELEVATIONS ACROSS THE WEST...
...LIGHT RAIN/FREEZING RAIN OVER PARTS OF THE NORTHERN HIGH PLAIN
ON SATURDAY EVENING INTO SUNDAY; LIGHT PATCHY RAIN/FREEZING RAIN
OVER PARTS OF THE UPPER MISSISSIPPI VALLEY/GREAT LAKES ON SUNDAY
EVENING INTO MONDAY...
...TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER THE
NORTHEAST AND MID-ATLANTIC...
UPPER-LEVEL TROUGHING AND UPPER-LEVEL ENERGY WILL CREATE
LAKE-EFFECT SNOW DOWNWIND FROM THE GREAT LAKES AND UPSLOPE SNOW
OVER PARTS OF NEW ENGLAND THROUGH SUNDAY MORNING. FURTHERMORE,
HIGH PRESSURE OVER THE GREAT LAKES ON SATURDAY WILL MOVE EASTWARD
TO OFF THE NEW ENGLAND COAST BY MONDAY. THE HIGH PRESSURE WILL
BRING TEMPERATURES 10 TO 20 DEGREES BELOW AVERAGE OVER THE
NORTHEAST AND MID-ATLANTIC.
IN ADDITION, UPPER-LEVEL ENERGY OVER THE NORTHWEST WILL MOVE
EASTWARD TO THE GREAT LAKES BY MONDAY EVENING. WEAK ONSHORE FLOW
ASSOCIATED WITH THE ENERGY WILL PRODUCE LIGHT COASTAL RAIN AND
HIGHER-ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST AND
NORTHERN/CENTRAL CALIFORNIA THROUGH SUNDAY MORNING. AS THE ENERGY
MOVES FARTHER EASTWARD, LIGHT SNOW WILL DEVELOP OVER PARTS OF THE
NORTHERN ROCKIES LATE SATURDAY EVENING INTO SUNDAY MORNING.
ON SUNDAY AFTERNOON, A FRONT OVER THE EASTERN PACIFIC WILL MOVE
INTO THE WEST COAST AND DISSIPATE. MOISTURE ASSOCIATED WITH THE
BOUNDARY WILL PRODUCE LIGHT RAIN OVER PARTS OF THE PACIFIC
NORTHWEST AND NORTHERN CALIFORNIA OVERNIGHT SUNDAY INTO MONDAY.
MEANWHILE, A WAVE OF LOW PRESSURE OVER THE NORTHERN HIGH PLAINS ON
SATURDAY WILL MOVE EASTWARD TO THE GREAT LAKES BY MONDAY EVENING.
THE SYSTEM WILL PRODUCE LIGHT SNOW OVER PARTS OF THE NORTHERN
PLAINS ON SUNDAY AFTERNOON INTO EVENING. ALONG THE RAIN/SNOW LINE,
AREAS OF LIGHT RAIN/FREEZING RAIN WILL DEVELOP OVER PARTS OF THE
REGION THROUGH SUNDAY NIGHT. ON MONDAY, AS THE STORM MOVES INTO
THE GREAT LAKES, LIGHT TO MODERATE SNOW WILL DEVELOP OVER PARTS OF
THE GREAT LAKES. THE SNOW WILL BE MORE MODERATE ALONG THE
NORTHEAST COASTLINE OF THE LOWER PENINSULA OF MICHIGAN AND THE
SOUTH COAST OF THE UPPER PENINSULA OF MICHIGAN. RAIN WILL ALSO
DEVELOP OVER PARTS OF THE OHIO, MIDDLE/LOWER MISSISSIPPI VALLEYS,
AND SOUTHERN PLAINS BY MONDAY EVENING. FURTHER, ALONG THE
RAIN/SNOW LINE, POCKETS OF RAIN/FREEZING RAIN WILL DEVELOP OVER
PARTS OF THE GREAT LAKES AND UPPER MISSISSIPPI VALLEY.
ZIEGENFELDER
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