473
FXUS01 KWBC 150754
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
253 AM EST SUN DEC 15 2024
VALID 12Z SUN DEC 15 2024 - 12Z TUE DEC 17 2024
...WINTRY MIX EXPECTED FOR THE APPALACHIANS SUNDAY WITH THE
POTENTIAL FOR SIGNIFICANT ICING IN THE CENTRAL APPALACHIANS...
...SHOWERS AND STORMS WITH LOCALLY HEAVY RAINFALL POSSIBLE ACROSS
THE LOWER OHIO VALLEY THROUGH MONDAY...
...PACIFIC SYSTEM TO BRING A RENEWED ROUND OF LOWER
ELEVATION/COASTAL RAIN AND HEAVY MOUNTAIN SNOW TO THE NORTHWEST
LATE SUNDAY INTO MONDAY...
AN UPPER-LEVEL WAVE HAS HELPED TRIGGER A BROAD AREA OF WINTRY
PRECIPITATION THIS MORNING WHICH WILL PASS THROUGH THE INTERIOR
NORTHEAST/APPALACHIANS THROUGH THE DAY SUNDAY. SOME LIGHT SNOW
ACCUMULATIONS WILL BE POSSIBLE FOR THE CENTRAL/NORTHERN
APPALACHIANS WITH SOME ICE ACCRETIONS EXPECTED FOR THE
SOUTHERN/CENTRAL APPALACHIANS. MORE SIGNIFICANT ICE ACCRETIONS OF
0.1-0.3" ARE FORECAST FOR A SMALLER REGION OF EASTERN WEST
VIRGINIA NORTH THROUGH WESTERN MARYLAND AND INTO SOUTHWEST
PENNSYLVANIA WHICH COULD CAUSE TREE AND POWER LINE DAMAGE. SOME
LIGHTER RAIN SHOWERS WILL BE POSSIBLE ALONG THE EASTERN SEABOARD.
THE WINTRY PRECIPITATION WILL LIFT NORTHWARD INTO NEW ENGLAND
BRINGING SOME LIGHTER ACCUMULATIONS INTO THE DAY MONDAY.
FURTHER WEST, ANOTHER UPPER-LEVEL WAVE/ACCOMPANYING SURFACE
FRONTAL SYSTEM WILL BETTER ORGANIZE ALONG THE HIGH PLAINS AND PUSH
EASTWARD INTO THE PLAINS SUNDAY. SOME LIGHT SNOW/ICE ACCUMULATIONS
WILL BE POSSIBLE NORTHWEST OF THE SYSTEM OVER PORTIONS OF THE
NORTHERN PLAINS THROUGH SUNDAY EVENING BEFORE SHIFTING INTO THE
UPPER MIDWEST MONDAY. TO THE SOUTH, MOIST RETURN FLOW FORM THE
GULF REACHING THE EASTWARD MOVING FRONTAL SYSTEM WILL LEAD TO
INCREASING COVERAGE OF SHOWERS AND THUNDERSTORMS ACROSS THE LOWER
OHIO VALLEY SOUTHWEST INTO THE SOUTHERN PLAINS BY LATE SUNDAY.
COVERAGE AND INTENSITY SHOULD INCREASE THROUGH THE DAY MONDAY AS
THE FRONT PUSHES SOUTHEASTWARD INTO THE TENNESSEE VALLEY AND LOWER
MISSISSIPPI VALLEY THROUGH MONDAY EVENING. SOME LOCALLY HEAVY
RAINFALL WILL BE POSSIBLE, PARTICULARLY ACROSS THE LOWER OHIO
VALLEY MONDAY. SHOWERS ARE ALSO EXPECTED TO SPREAD EASTWARD INTO
THE NORTHEAST MONDAY.
SOME MODERATE TO LOCALLY HEAVY SNOW WILL CONTINUE THROUGH SUNDAY
MORNING FOR HIGHER MOUNTAIN ELEVATIONS OF THE NORTHERN
ROCKIES/GREAT BASIN AS WELL AS FOR THE CASCADES AS AN UPPER-LEVEL
TROUGH DEPARTS THE REGION. PRECIPITATION SHOULD GENERALLY TEND TO
TAPER OFF THROUGH THE AFTERNOON. HOWEVER, ANOTHER PACIFIC SYSTEM
APPROACHING THE PACIFIC NORTHWEST/NORTHERN CALIFORNIA WILL BRING A
RENEWED ROUND OF PRECIPITATION SPREADING INLAND THROUGH THE
NORTHWEST BY SUNDAY NIGHT. MODERATE TO HEAVY LOWER
ELEVATION/COASTAL RAIN, A WINTRY MIX FOR INLAND VALLEYS, AND
MODERATE TO HEAVY MOUNTAIN SNOW CAN ALL BE EXPECTED THROUGH
MONDAY. THE HEAVIEST SNOW TOTALS OF 8-12", LOCALLY HIGHER, ARE
MOST LIKELY FROM THE SOUTHERN CASCADES/NORTHERN CALIFORNIA EAST
THROUGH OREGON INTO CENTRAL IDAHO AND NORTHWEST WYOMING. SOME
GUSTY WINDS CAN ALSO BE EXPECTED ALONG THE PACIFIC COAST.
ELSEWHERE, SOME SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ALONG
THE EAST COAST OF FLORIDA NORTH THROUGH THE CAROLINAS THE NEXT
COUPLE OF DAYS. TEMPERATURE-WISE, CONDITIONS WILL GENERALLY BE AT
OR ABOVE AVERAGE FOR MOST OF THE COUNTRY. SOME OF THE MOST
ANOMALOUS TEMPERATURES WILL BE OVER CENTRAL PORTIONS OF THE
COUNTRY, WITH HIGHS IN THE 60S AND 70S FOR THE SOUTHERN PLAINS
SUNDAY AND HIGHS INTO THE 50S FOR MANY IN THE MIDWEST ON MONDAY.
ONE OF THE COOLER SPOTS WILL BE ALONG THE EAST COAST AS COLD AIR
REMAINS IN PLACE ALONG THE APPALACHIANS SUNDAY, WITH HIGHS IN THE
30S AND 40S AS FAR SOUTH AS THE WESTERN CAROLINAS AND NORTHERN
GEORGIA. TEMPERATURES WILL WARM ABOVE AVERAGE HERE AS WELL ON
MONDAY WITH HIGHS REACHING INTO THE 40S AND 50S.
PUTNAM
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