725
FXUS01 KWBC 261955
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
254 PM EST THU DEC 26 2024
VALID 00Z FRI DEC 27 2024 - 00Z SUN DEC 29 2024
...STORMY WEATHER PATTERN TO CONTINUE ACROSS THE NORTHWESTERN U.S.
INTO THIS WEEKEND WITH HEAVY LOWER ELEVATION RAINS AND HIGHER
ELEVATION HEAVY SNOWS...
...INCREASINGLY WET PATTERN DEVELOPING FROM THE LOWER MISSISSIPPI
VALLEY, SPREADING NORTHEAST INTO THE TENNESSEE VALLEY, SOUTHERN
APPALACHIANS AND MID-ATLANTIC...
...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 AS ADDITIONAL STORM SYSTEMS
MOVE OFF 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 MOVING INLAND THURSDAY NIGHT ACROSS NORTHERN CALIFORNIA
INTO THE PACIFIC NORTHWEST AND THEN INLAND ACROSS THE NORTHERN
ROCKIES ON FRIDAY. THIS WILL BE FOLLOWED BY ANOTHER HEAVY
PRECIPITATION PRODUCER MOVING INLAND FRIDAY NIGHT 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 ENHANCING
OVER EASTERN PORTIONS OF THE SOUTHERN PLAINS THIS AFTERNOON WILL
SPREAD INTO THE LOWER MISSISSIPPI VALLEY/TENNESSEE VALLEY TONIGHT,
NORTHWARD INTO THE UPPER MISSISSIPPI VALLEY ON FRIDAY AND EASTWARD
INTO THE SOUTHERN APPALACHIANS AND MID-ATLANTIC SATURDAY AND
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 RAINS
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 POTENTIAL FOR RECORD HIGH MORNING LOW
TEMPERATURES ACROSS THE CENTRAL PLAINS INTO THE MID TO UPPER
MISSISSIPPI VALLEY ON FRIDAY AND ACROSS THE UPPER MISSISSIPPI
VALLEY AND GREAT LAKES REGION ON SATURDAY.
ORAVEC
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