140
FXUS01 KWBC 200433
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1132 PM EST THU DEC 19 2024
VALID 12Z FRI DEC 20 2024 - 12Z SUN DEC 22 2024
...SNOW WILL FALL OVER PARTS OF THE GREAT LAKES, CENTRAL
APPALACHIANS, AND NORTHEAST...
...RECORD WARMTH POSSIBLE ACROSS THE WEST FRIDAY AND 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 FRIDAY 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.
HIGH TEMPERATURES ACROSS NORTHERN PORTIONS OF THE WEST WILL RISE
INTO THE 40S AND 50S, HIGH ENOUGH TO THREATEN RECORD HIGH
TEMPERATURES FRIDAY INTO 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 FRIDAY AND SATURDAY. WINTER
WEATHER ADVISORIES ARE IN EFFECT FOR PORTIONS OF MICHIGAN AND THE
SOUTHERN APPALACHIANS TO ADVISE FURTHER ON THE SNOW THREAT.
ACROSS LOWER ELEVATIONS OF THE CAROLINAS AND SOUTHERN MID-ATLANTIC
COAST, RAIN WILL BE POSSIBLE ON FRIDAY BEFORE THE LOWS MOVE OUT TO
SEA.
ROTH
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page