Prognostic Meteorological Discussion
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FXUS01 KWBC 190803
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
303 AM EST FRI DEC 19 2014

VALID 12Z FRI DEC 19 2014 - 12Z SUN DEC 21 2014

***HEAVY RAIN AND MOUNTAIN SNOW FOR THE NORTHWEST U.S.***

***RAIN AND THUNDERSTORMS FOR THE GULF COAST REGION***

***SEASONABLY COOL ACROSS MOST OF THE COUNTRY THROUGH SUNDAY***

STRONG DEEP-LAYER FLOW FROM THE PACIFIC WILL KEEP THE WEATHER
PATTERN ACTIVE FROM THE PACIFIC NORTHWEST TO THE CENTRAL AND
NORTHERN ROCKIES THROUGH SATURDAY NIGHT.  A COUPLE OF STRONG
DISTURBANCES IN THIS FAST FLOW WILL PIVOT AROUND A DEEP LOW
PRESSURE SYSTEM OVER THE GULF OF ALASKA.  THESE DISTURBANCES,
ALONG WITH THEIR SURFACE COLD FRONTS, ARE FORECAST TO BRING HEAVY
RAIN FOR THE COASTAL AREAS OF THE PACIFIC NORTHWEST, WITH SOME
AMOUNTS IN EXCESS OF 4 INCHES POSSIBLE BY SUNDAY MORNING.  VERY
HEAVY SNOW IN THE HIGHER MOUNTAIN RANGES COULD REACH 1 TO 3 FEET
WITH COPIOUS MOISTURE BEING FORCED UP THE TOPOGRAPHY.

FOR THE DEEP SOUTH AND GULF COAST REGION, A WAVE OF LOW PRESSURE
DEVELOPING ALONG A FRONTAL BOUNDARY OVER THE NORTHERN GULF OF
MEXICO WILL KEEP THE WEATHER UNSETTLED TO CLOSE OUT THE WORK WEEK.
 BASED ON THE LATEST FORECASTS, IT APPEARS THAT THE MID-ATLANTIC
REGION AND THE NORTHEAST U.S. SHOULD AVOID SEEING ANY SIGNIFICANT
PRECIPITATION FROM THIS SYSTEM SINCE IT WILL REMAIN ON A MORE
SOUTHERN TRACK.

ELSEWHERE ACROSS THE CONTINENTAL U.S., IT SHOULD BE MOSTLY DRY
WITH PARTLY CLOUDY CONDITIONS AND SEASONAL TEMPERATURES.  THE
EXCEPTION WILL BE SOME SCATTERED SNOW SHOWERS NEAR THE GREAT
LAKES.  THE BITTERLY COLD ARCTIC AIR SHOULD REMAIN NORTH OF THE
CANADIAN BORDER FOR THE NEXT FEW DAYS.

HAMRICK


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