Prognostic Meteorological Discussion
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FXUS01 KWBC 261954
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
253 PM EST FRI DEC 26 2014

VALID 00Z SAT DEC 27 2014 - 00Z MON DEC 29 2014

...A COLD FRONT CROSSING THE CENTRAL U.S. WILL SPREAD SNOW ACROSS
THE MIDWEST AND TRIGGER HEAVY RAINS ALONG THE CENTRAL GULF COAST...

...COOLING TREND EXPECTED FROM THE NORTHWEST TO THE CENTRAL U.S....

...INCOMING PACIFIC SYSTEM EXPECTED TO BRING SNOW AND RAIN TO THE
NORTHWEST THIS WEEKEND...

A COLD FRONT WILL CONTINUE TO EDGE EASTWARD THROUGH THE CENTRAL
U.S. THIS WEEKEND.  LIGHT SNOWS WILL SPREAD ACROSS MUCH OF THE
MIDWEST AS A SURFACE WAVE ALONG THE BOUNDARY STEADILY LIFTS
NORTHEASTWARD THROUGH THE MIDDLE MISSISSIPPI VALLEY AND UPPER
GREAT LAKES.  AHEAD OF THE FRONT...A RICH SUPPLY OF GULF MOISTURE
PULLING NORTHWARD WILL FUEL WIDESPREAD SHOWER ACTIVITY.  ORGANIZED
AREAS OF HEAVY DOWNPOURS AND THUNDERSTORMS WILL BE POSSIBLE FROM
THE LOWER MISSISSIPPI VALLEY TO THE TENNESSEE VALLEY...WITH THE
GREATEST CHANCE FOR ANY FLASH FLOODING EXPECTED ALONG THE CENTRAL
GULF COAST.  AS THE FRONT CROSSES THE APPALACHIANS AND
PRECIPITATION REACHES INTO THE EASTERN U.S....ABOVE NORMAL
TEMPERATURES WILL KEEP THE MAJORITY OF PRECIPITATION RAIN WITH THE
EXCEPTION OF SOME MIXED PRECIPITATION EXPECTED IN INTERIOR NEW
ENGLAND.

COOLER AIR FILLING IN BEHIND THE COLD FRONT PRESSING THROUGH THE
MIDDLE OF THE NATION WILL PUT AN END TO THE MILD CONDITIONS IN
PLACE FROM THE MISSISSIPPI VALLEY TO THE EASTERN SEABOARD.  EVEN
MORE IMPRESSIVE WILL BE THE FRESH SURGE OF ARCTIC AIR EXPECTED TO
PLUMMET INTO THE NORTH CENTRAL U.S. BY THE END OF THE WEEKEND AS A
STRONG SURFACE HIGH NOSES DOWN FROM WESTERN CANADA.

A ROBUST SYSTEM DROPPING THROUGH THE NORTHEAST PACIFIC AND BRITISH
COLUMBIA WILL BRING UNSETTLED WEATHER INTO THE NORTHWEST THIS
WEEKEND.  LOWERING SNOW LEVELS WILL BRING WIDESPREAD ACCUMULATIONS
ACROSS THE CASCADES AND NORTHERN ROCKIES.

GERHARDT

GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$





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