610
FXUS01 KWBC 270718
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
218 AM EST FRI DEC 27 2024
VALID 12Z FRI DEC 27 2024 - 12Z SUN DEC 29 2024
...STORMY WEATHER PATTERN TO CONTINUE ACROSS THE NORTHWESTERN U.S.
INTO THIS WEEKEND WITH HEAVY LOWER ELEVATION RAIN AND HIGHER
ELEVATION HEAVY SNOW...
...INCREASINGLY WET PATTERN DEVELOPING FROM THE LOWER MISSISSIPPI
VALLEY, SPREADING NORTHEAST INTO THE TENNESSEE VALLEY,
APPALACHIANS, MID-ATLANTIC AND NORTHEAST...
...ARCTIC AIR REMAINS ABSENT FROM THE LOWER 48 WITH MUCH ABOVE
AVERAGE TEMPERATURES ACROSS NEARLY ALL OF THE COUNTRY...
THE RECENT STORMY WEATHER PATTERN ACROSS THE NORTHWESTERN U.S.
WILL CONTINUE OVER THE NEXT FEW DAYS WHILE A SEQUENCE OF STORM
SYSTEMS MOVE ONSHORE FROM THE PACIFIC. THE WIDESPREAD
PRECIPITATION THAT HAS OCCURRED ACROSS THE NORTHERN ROCKIES AND
PACIFIC NORTHWEST OVER THE PAST 24 HOURS WILL BE FOLLOWED BY
ANOTHER HEAVY PRECIPITATION PRODUCER ACROSS NORTHERN CALIFORNIA
INTO THE PACIFIC NORTHWEST AND THEN INLAND ACROSS THE NORTHERN
ROCKIES TODAY. THIS WILL BE FOLLOWED BY ANOTHER HEAVY
PRECIPITATION PRODUCER MOVING INLAND TONIGHT ACROSS THE PACIFIC
NORTHWEST AND INTO THE NORTHERN ROCKIES DURING SATURDAY. YET
ANOTHER PACIFIC STORM WILL SPREAD ANOTHER ROUND OF HEAVY
PRECIPITATION INTO THE NORTHWESTERN U.S. SUNDAY INTO MONDAY. BY
THE END OF THE WEEKEND, RAINFALL TOTALS OF 3-5"+ LIKELY THROUGH
THE WASHINGTON AND OREGON CASCADES, NORTHWEST CALIFORNIA COASTAL
MOUNTAINS INTO THE NORTHERN SIERRA, WHILE SNOWFALL TOTALS OF 1 TO
3 FEET ARE LIKELY IN THE HIGHEST ELEVATIONS OF THE NORTHWEST. THE
RECENT WET WEATHER PATTERN ACROSS THE NORTHWEST AND LIKELIHOOD OF
ADDITIONAL WIDESPREAD HEAVY PRECIPITATION AMOUNTS INTO THIS
WEEKEND WILL RESULT IN INCREASING STREAM FLOWS AND SOIL SATURATION
LEVELS, LEADING TO AN INCREASING THREAT OF RIVER FLOODING, ROCK
AND MUDSLIDES.
WET WEATHER WILL ALSO BE INCREASING OVER THE NEXT FEW DAYS FROM
LOWER MISSISSIPPI VALLEY, NORTHEASTWARD INTO THE TENNESSEE VALLEY,
SOUTHERN APPALACHIANS AND MID-ATLANTIC. PRECIPITATION WILL SPREAD
NORTHWARD INTO THE UPPER MISSISSIPPI VALLEY TODAY AND EASTWARD
INTO THE SOUTHERN APPALACHIANS ON SATURDAY THEN THE MID-ATLANTIC
AND NORTHEAST SATURDAY NIGHT INTO SUNDAY. WHILE DROUGHT
CONDITIONS HAVE IMPROVED OVER THE PAST FEW WEEKS ACROSS PORTIONS
OF THE SOUTH AND EAST, MANY AREAS STILL REMAIN BELOW AVERAGE WITH
PRECIPITATION, WITH THE UPCOMING RAIN MUCH WELCOMED HYDROLOGICALLY.
WHILE IT WILL BE STORMY OVER THE NEXT FEW DAYS ACROSS LARGE
PORTIONS OF THE LOWER 48, ARCTIC AIR WILL REMAIN ABSENT AS THE
OVERALL FLOW ACROSS THE NATION IS FROM WEST TO EAST, KEEPING
ARCTIC AIR WELL NORTH OF THE U.S./CANADIAN BORDER. MUCH OF THE
LOWER 48 WILL SEE MUCH ABOVE AVERAGE TEMPERATURES OVER THE NEXT
FEW DAYS. THIS WILL BE A CONTINUATION TO THE ABOVE AVERAGE
PATTERN FOR AREAS TO THE WEST OF THE MISSISSIPPI RIVER, BUT A
REVERSAL OF THE OVERALL BELOW AVERAGE PATTERN THAT HAS DOMINATED
AREAS EAST OF THE MISSISSIPPI DURING DECEMBER. THIS MUCH ABOVE
AVERAGE PATTERN WILL SUPPORT THE POTENTIAL FOR RECORD HIGH MORNING
LOW TEMPERATURES ACROSS THE CENTRAL PLAINS INTO THE MID TO UPPER
MISSISSIPPI VALLEY ON TODAY, ACROSS THE UPPER MISSISSIPPI VALLEY
AND GREAT LAKES REGION ON SATURDAY, AND THE MID-ATLANTIC AND
NORTHEAST ON SUNDAY.
KEBEDE/ORAVEC
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