754
FXUS01 KWBC 201957
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
257 PM EST FRI DEC 20 2024
VALID 00Z SAT DEC 21 2024 - 00Z MON DEC 23 2024
...SNOW WILL FALL OVER PARTS OF THE GREAT LAKES, CENTRAL
APPALACHIANS, AND NORTHEAST...
...RECORD WARMTH POSSIBLE ACROSS PARTS OF THE WEST SATURDAY,,,
THE GENERAL FLOW PATTERN FAVORS AN UPPER LEVEL TROUGH ACROSS THE
EASTERN PACIFIC OCEAN, RIDGING ALOFT IN THE WEST, AND TROUGHING
ALOFT IN THE EASTERN UNITED STATES. THE CONSEQUENCE OF THIS
PATTERN WILL BE SOME RAINFALL ALONG THE WEST COAST, WARMTH ACROSS
THE INTERMOUNTAIN WEST, AND COLD ACROSS PORTIONS OF THE EAST.
STARTING OUT WEST, SKIRMISHES OF RAIN ALONG THE WEST COAST ARE
EXPECTED BOTH TONIGHT AND SATURDAY AS LOW PRESSURE SYSTEMS MOVE
FROM THE EASTERN PACIFIC FIRST INTO ALASKA THEN INTO WESTERN
CANADA. BY SATURDAY, THE SECOND LOW MOVING INTO WESTERN CANADA
WILL PUSH RAINFALL INTO THE NORTHERN INTERMOUNTAIN WEST, AND
SNOWFALL AT HIGHER ELEVATIONS BY SATURDAY AFTERNOON AND EVENING.
ON SUNDAY, A THIRD LOW PRESSURE SYSTEM WILL ARRIVE ALONG THE WEST
COAST, BRINGING MORE RAIN SHOWERS AND VERY HIGH ELEVATION SNOW TO
THE REGION. HIGH TEMPERATURES ACROSS NORTHERN PORTIONS OF THE WEST
WILL RISE INTO THE 40S AND 50S, HIGH ENOUGH TO THREATEN RECORD
HIGH TEMPERATURES ON SATURDAY. ACROSS THE SOUTHWEST, HIGH
TEMPERATURES SHOULD RISE INTO THE 70S AND 80S, ALSO THREATENING
RECORD HIGH TEMPERATURES IN AND NEAR SOUTHERN ARIZONA.
MID-CONTINENT, A SEASONABLY STRONG AND COLD HIGH PRESSURE SYSTEM
MIGRATES FROM THE GREAT PLAINS INTO THE GREAT LAKES, BRINGING
BELOW AVERAGE TEMPERATURES NEAR AND TO ITS EAST. FOR SOME AREAS
OF THE EAST, IT SHOULD BE THE COLDEST TEMPERATURES THUS FAR THIS
WINTER. WHEN COMBINED WITH CYCLONIC FLOW AROUND A PAIR OF LOWS
MOVING THROUGH THE MIDWEST AND OFFSHORE THE EAST COAST, LAKE
EFFECT AND LAKE ENHANCED SNOWFALL IS EXPECTED NEAR THE OHIO
VALLEY, GREAT LAKES, PORTIONS OF THE APPALACHIANS, NORTHERN
MID-ATLANTIC STATES, AND NEW ENGLAND THROUGH SATURDAY. WINTER
WEATHER ADVISORIES ARE IN EFFECT FOR PORTIONS OF MICHIGAN AND THE
CENTRAL/SOUTHERN APPALACHIANS TO ADVISE FURTHER ON THE SNOW THREAT.
KEBEDE/ROTH
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