Prognostic Meteorological Discussion
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FXUS01 KWBC 170852
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
351 AM EST WED DEC 17 2014

VALID 12Z WED DEC 17 2014 - 12Z FRI DEC 19 2014


...WIDELY SCATTERED SHOWERS EXPECTED ACROSS THE WESTERN U.S....

...WEATHER WILL BECOME INCREASINGLY ACTIVE OVER THE SOUTH CENTRAL
U.S....

...CONDITIONS WILL REMAIN UNSETTLED FROM THE GREAT LAKES TO THE
NORTHEAST...


MULTIPLE WEAK PIECES OF ENERGY RIPPLING THROUGH THE FLOW ALOFT
WILL TRIGGER WIDELY SCATTERED SHOWERS ACROSS THE WESTERN U.S.
WEDNESDAY AND THURSDAY.  MOISTURE WILL BE EXTREMELY LIMITED WITH
THESE FEATURES...KEEPING PRECIPITATION TOTALS LIGHT AND CONFINED
TO THE FAVORED SLOPES OF THE TERRAIN; HOWEVER...A MORE ROBUST
SYSTEM APPROACHING THE COAST WILL BRING SOME MORE SIGNIFICANT
PRECIPITATION INTO THE PACIFIC NORTHWEST BY LATE THURSDAY OR EARLY
FRIDAY.

UPPER ENERGY SWINGING OUT OF THE SOUTHWEST...COMBINED WITH RETURN
FLOW FROM THE WESTERN GULF...WILL SPREAD PRECIPITATION ACROSS THE
SOUTH CENTRAL U.S. WEDNESDAY INTO THURSDAY.  RUMBLES OF THUNDER
WILL BE POSSIBLE ACROSS TEXAS WHILE A MIX OF SNOW...SLEET...AND
FREEZING RAIN IS EXPECTED WITHIN THE NORTHERN EDGE OF THE
PRECIPITATION SHIELD STRETCHING ACROSS THE CENTRAL PLAINS AND
MIDDLE MISSISSIPPI VALLEY.  UPSTREAM...A SECOND PIECE OF ENERGY
ALOFT WILL CROSS NORTHERN MEXICO AND IS EXPECTED TO IGNITE AN AREA
OF HEAVY RAINS AND THUNDERSTORMS OVER TEXAS BY EARLY FRIDAY.

A SURFACE LOW DEEPENING OFF THE NEW ENGLAND COAST AND LIFTING
TOWARDS THE CANADIAN MARITIMES WILL KEEP CONDITIONS UNSETTLED FROM
THE GREAT LAKES TO THE NORTHEAST THE NEXT FEW DAYS.  ATLANTIC
MOISTURE WRAPPING AROUND THE STRENGTHENING STORM WILL FUEL
WIDESPREAD COASTAL RAINS AND INTERIOR SNOWS.  ALSO...THE WARM
OCEAN AIR MOVING IN OVER COOLER AIR AT THE SURFACE COULD RESULT IN
PERIODS OF FREEZING RAIN ACROSS PORTIONS OF INTERIOR NEW ENGLAND.


GERHARDT


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