200
FXUS01 KWBC 171954
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
253 PM EST TUE DEC 17 2024
VALID 00Z WED DEC 18 2024 - 00Z FRI DEC 20 2024
...WET AND WINDY WEATHER TO CONTINUE ACROSS THE NORTHWEST INTO
TONIGHT...
...STRONG TO SEVERE STORMS AND HEAVY RAIN FORECAST TO DEVELOP FROM
THE SOUTHERN PLAINS TO THE TENNESSEE VALLEY TONIGHT INTO
WEDNESDAY...
...PERIODS OF SNOW FOR THE NORTHERN PLAINS THROUGH MID-WEEK WITH
HEAVIER ACCUMULATIONS MOST LIKELY WEDNESDAY NIGHT...
...MUCH ABOVE AVERAGE TEMPERATURES EXPECTED FOR MOST OF THE LOWER
48 INTO MID-WEEK...
THE ATMOSPHERIC RIVER EVENT IMPACTING THE NORTHWEST WILL CONTINUE
OVERNIGHT INTO WEDNESDAY, WITH PRECIPITATION SPREADING FROM
WESTERN WASHINGTON AND OREGON THROUGH THE NORTHERN INTERMOUNTAIN
WEST AND INTO THE NORTHERN ROCKIES. ALONG THE COAST, WINDY
CONDITIONS WITH PERIODS OF HEAVY RAIN ARE EXPECTED TONIGHT.
FURTHER INLAND, APART FROM THE HIGHER ELEVATIONS OF THE CASCADES
AND THE NORTHERN ROCKIES, SNOW WILL LIKELY CHANGE TO A WINTRY MIX
AND RAIN AS A STRONG WARM FRONT LIFTS ACROSS THE REGION.
PRECIPITATION WILL WANE FROM THE PACIFIC NORTHWEST TO THE NORTHERN
ROCKIES AS AN ASSOCIATED UPPER-LEVEL WAVE MOVES EAST OF THE REGION
BY LATE WEDNESDAY. PRECIPITATION WILL DEVELOP AND SPREAD EAST
ACROSS THE NORTHERN PLAINS INTO THE UPPER MIDWEST AS THIS UPPER
SYSTEM AND AN ASSOCIATED AREA OF SURFACE LOW PRESSURE DROPS ACROSS
THE REGION WEDNESDAY NIGHT AND THURSDAY. THIS STORM WILL BRING
LIGHT TO MODERATE SNOWS FROM NORTH DAKOTA TO WISCONSIN, WITH A
WINTRY MIX FURTHER SOUTH AND WEST, INCLUDING THE THREAT OF
ACCUMULATING ICE FROM NORTHEASTERN MONTANA TO EASTERN SOUTH
DAKOTA.
FURTHER SOUTH AND EAST, A SLOW-MOVING FRONTAL BOUNDARY EXTENDING
ACROSS PORTIONS OF THE TENNESSEE VALLEY BACK INTO THE SOUTHERN
PLAINS WILL BECOME A FOCUS FOR SHOWERS AND THUNDERSTORMS, WITH THE
POTENTIAL FOR SEVERE WEATHER AND HEAVY RAIN. ISOLATED STRONG TO
SEVERE THUNDERSTORMS ARE POSSIBLE TONIGHT THROUGH EARLY WEDNESDAY
MORNING FROM PARTS OF NORTHEASTERN TEXAS TO WESTERN TENNESSEE,
WITH THE THREAT CONTINUING ACROSS WESTERN TENNESSEE AND SPREADING
THROUGH MIDDLE TENNESSEE MID-DAY.
AN AREA OF LOW PRESSURE IS EXPECTED TO ORGANIZE AND TRACK
NORTHEAST, BRINGING UNSETTLED WEATHER FROM THE OHIO VALLEY INTO
THE MID-ATLANTIC AND NORTHEAST LATE WEDNESDAY. RAIN IS FORECAST
FOR MOST AREAS FROM THE OHIO VALLEY TO THE MID-ATLANTIC AND THE
COASTAL NORTHEAST. WINTRY PRECIPITATION WILL BE MOSTLY LIMITED TO
UPSTATE NEW YORK AND NORTHERN NEW ENGLAND, WITH THE MORE
SIGNIFICANT THREAT OF ACCUMULATING SNOWS CONFINED TO THE MOUNTAINS.
FURTHER TO THE SOUTH, SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD
OF THE LOW'S TRAILING COLD FRONT AS IT ADVANCES ACROSS THE
SOUTHEAST LATE WEDNESDAY.
APART FROM THE NORTHERN PLAINS AND UPPER MIDWEST, TEMPERATURES
WILL REMAIN ABOVE AVERAGE ACROSS MUCH OF THE COUNTRY. TEMPERATURES
WILL BE WELL ABOVE AVERAGE ACROSS PORTIONS OF THE SOUTHWESTERN
U.S. AND MAY REACH RECORD HIGHS FROM SOUTHERN CALIFORNIA INTO THE
DESERT SOUTHWEST ON WEDNESDAY AND THURSDAY.
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