869
FXUS01 KWBC 151950
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
249 PM EST SUN DEC 15 2024
VALID 00Z MON DEC 16 2024 - 00Z WED DEC 18 2024
...WINTRY MIX EXPECTED FOR PORTIONS OF THE CENTRAL APPALACHIANS,
NORTHERN MID-ATLANTIC, SOUTHERN NEW YORK AND SOUTHERN NEW ENGLAND
THIS EVENING AND OVERNIGHT...
...SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL POSSIBLE
ACROSS THE OHIO VALLEY THROUGH MONDAY...
...MODEST ATMOSPHERIC RIVER ACTIVITY TO BRING UNSETTLED WEATHER TO
THE PACIFIC NORTHWEST AND NORTHERN ROCKIES GOING THROUGH EARLY
THIS WEEK, INCLUDING HEAVY RAINS FOR THE COASTAL RANGES AND
ACCUMULATING SNOW FOR THE HIGHER ELEVATIONS...
AN UPPER-LEVEL DISTURBANCE WILL CONTINUE TO CROSS THROUGH THE
CENTRAL APPALACHIANS AND INTO PORTIONS OF SOUTHERN NEW YORK AND
SOUTHERN NEW ENGLAND GOING THROUGH THIS EVENING AND OVERNIGHT
WHICH WILL BRING AN AREA OF GENERALLY LIGHT PRECIPITATION.
SUFFICIENT COLD AIR IS IN PLACE AT LEAST EARLY ON TO FACILITATE
AREAS OF LIGHT SNOW ALONG WITH SOME SLEET AND FREEZING RAIN.
LOCALLY A FEW INCHES OF SNOW WILL BE POSSIBLE ACROSS THE INTERIOR
OF THE NORTHERN MID-ATLANTIC, ALONG WITH A GLAZE OF ICE BEFORE
TEMPERATURES WARM UP AND ALLOW FOR A CHANGEOVER TO RAIN LATER
TONIGHT AND EARLY MONDAY MORNING. A CHILLY RAIN CAN BE EXPECTED
ELSEWHERE TONIGHT ACROSS THE MID-ATLANTIC.
MEANWHILE, FARTHER TO THE WEST, A NEW STORM SYSTEM AND AN
ASSOCIATED FRONTAL SYSTEM WILL BE EJECTING ACROSS THE PLAINS AND
MIDWEST BY MONDAY. THIS WILL DRIVE A THREAT FOR AREAS OF SHOWERS
AND A FEW THUNDERSTORMS ACROSS MUCH OF THE OHIO VALLEY LATER
TONIGHT AND MONDAY AS INCREASINGLY MOIST AND SOMEWHAT UNSTABLE AIR
LIFTS NORTH IN CLOSE PROXIMITY TO THE ADVANCING COLD FRONT. SOME
OF THESE SHOWERS AND THUNDERSTORMS SHOULD EXTEND SOUTHWESTWARD
DOWN INTO AREAS OF THE LOWER MISSISSIPPI VALLEY. GENERALLY THE
RAINS ARE EXPECTED TO BE BENEFICIAL AND NOT EXCESSIVE WITH LOCALLY
1 TO 2 INCHES OF RAIN ANTICIPATED THROUGH MONDAY. THIS STORM
SYSTEM WILL QUICKLY LIFT ACROSS THE GREAT LAKES REGION, AND THE
TRAILING COLD FRONT SHOULD THEN CROSS THROUGH MUCH OF THE
MID-ATLANTIC AND NORTHEAST BY LATER TUESDAY. JUST AHEAD OF THE
COLD FRONT SHOULD BE THE POOLING OF MUCH MILDER AIR, AND
TEMPERATURES ACROSS MUCH OF THE EASTERN HALF OF THE COUNTRY SHOULD
SEE HIGH TEMPERATURES AS MUCH AS 10 TO 20 DEGREES ABOVE NORMAL
MONDAY AND TUESDAY. MUCH COLDER AIR THOUGH WILL BE ARRIVING ACROSS
THE NORTHERN PLAINS AND UPPER MIDWEST ON TUESDAY BEHIND AN ARCTIC
COLD FRONT, AND TEMPERATURES HERE WILL BE TRENDING BACK BELOW
NORMAL BY THE MIDDLE OF THE WEEK.
A NEW ROUND OF MODEST ATMOSPHERIC RIVER ACTIVITY ASSOCIATED WITH
ONSHORE PACIFIC FLOW AND THE ARRIVAL OF A COUPLE OF FRONTAL
SYSTEMS WILL KEEP AREAS OF THE PACIFIC NORTHWEST AND THE NORTHERN
ROCKIES UNSETTLED GOING THROUGH THE EARLY PART OF THE WEEK.
LOCALLY HEAVY RAINFALL CAN BE EXPECTED FOR THE COASTAL RANGES WITH
LOCALLY A FEW INCHES OF RAIN POSSIBLE ACROSS NORTHWEST OREGON AND
WESTERN WASHINGTON. MEANWHILE, HEAVY ACCUMULATING SNOW IS EXPECTED
FOR THE HIGHER ELEVATIONS. THIS WILL INCLUDE THE CASCADES,
SAWTOOTH, BITTERROOTS AND TETONS WHERE MULTI-DAY ACCUMULATIONS
THROUGH TUESDAY OF 1 TO 2+ FEET WILL BE POSSIBLE. SOME LESSER
ACCUMULATIONS WILL BE POSSIBLE ACROSS THE NORTHERN SIERRA NEVADA
AS MOISTURE GRADUALLY SETTLES FARTHER SOUTH.
THE REMAINDER OF THE COUNTRY INCLUDING THE SOUTHWEST AND ADJACENT
AREAS OF THE SOUTHERN U.S. SHOULD SEE GENERALLY DRY WEATHER
THROUGH THE FIRST HALF OF THE WEEK WITH TEMPERATURES ABOVE NORMAL.
ORRISON
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page