000
FXUS01 KWBC 130859
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
359 AM EST FRI DEC 13 2013

VALID 12Z FRI DEC 13 2013 - 12Z SUN DEC 15 2013

...A COMPLEX STORM SYSTEM WILL IMPACT MUCH OF THE CENTRAL AND
EASTERN U.S. THIS WEEKEND...

A COMPLEX STORM SYSTEM IMPACTING MUCH OF THE CENTRAL AND EASTERN
U.S. THIS WEEKEND WILL BE THE MAIN FOCUS DURING THE SHORT RANGE
PERIOD.  WIDESPREAD PRECIPITATION IS EXPECTED TO DEVELOP FROM THE
SOUTHERN PLAINS TO THE GREAT LAKES ON FRIDAY AS ENERGY ALOFT
SWINGS OUT OF THE SOUTHWEST AND SURGES MOISTURE NORTHWARD OUT OF
THE GULF OF MEXICO.  ON SATURDAY...PRECIPITATION WILL SPREAD EAST
OF THE APPALACHIANS WHILE THE ENERGY ALOFT ALOFT...AND ASSOCIATED
SURFACE LOW...QUICKLY LIFT NORTHEASTWARD THROUGH THE TENNESSEE AND
OHIO VALLEYS.  RAIN...WITH A FEW RUMBLES OF THUNDER...WILL BE THE
MAIN PRECIPITATION TYPE ACROSS THE SOUTHERN TIER...BUT
SUB-FREEZING TEMPERATURES ALREADY IN PLACE...COMBINED WITH ANOTHER
ARCTIC BOUNDARY SINKING THROUGH THE NATION...WILL COMPLICATE
PRECIPITATION TYPES FARTHER NORTH.  A WIDE SWATH OF ACCUMULATING
SNOWS ARE EXPECTED ACROSS THE OHIO VALLEY...NORTHERN MID-ATLANTIC
STATES...AND INTO THE NORTHEAST.

OUT WEST...WEAK ENERGY DROPPING SOUTHEASTWARD WILL TRIGGER LIGHT
SHOWERS ACROSS THE PACIFIC NORTHWEST AND NORTHERN ROCKIES ON
FRIDAY...BUT UPPER RIDGING BUILDING IN BEHIND THE ENERGY SHOULD
KEEP WEATHER FAIRLY QUIET FOR LOCATIONS WEST OF THE DIVIDE THIS
WEEKEND.

GERHARDT




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