Prognostic Meteorological Discussion
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FXUS01 KWBC 220811
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
310 AM EST SAT NOV 22 2014

VALID 12Z SAT NOV 22 2014 - 12Z MON NOV 24 2014

***UNSETTLED WEATHER PATTERN FOR THE WESTERN U.S.***

***INCREASING MOISTURE FOR THE CENTRAL U.S.***

***MODERATING TEMPERATURES FOR THE EASTERN U.S. THIS WEEKEND***

A PACIFIC STORM SYSTEM CROSSING THE WESTERN U.S. THIS WEEKEND IS
EXPECTED TO BRING WIDESPREAD PRECIPITATION FROM THE PACIFIC
NORTHWEST TO THE CENTRAL ROCKIES, AND THIS SHOULD LAST INTO SUNDAY
AS THE MOISTURE PLUME WORKS ITS WAY INLAND.  A SWATH OF STEADY
RAIN AND HIGH MOUNTAIN SNOW IS FORECAST ALONG AND JUST AHEAD OF
THE FRONT, AND SCATTERED RAIN/SNOW SHOWERS FOR MUCH OF THE GREAT
BASIN AND THE ROCKIES.  ELEVATION WILL BE A BIG FACTOR IN
DETERMINING PRECIPITATION TYPE.

FOR THE CENTRAL U.S., RETURN FLOW AROUND THE DEPARTING SURFACE
HIGH OVER THE EAST COAST WILL ALLOW FOR STEADILY INCREASING
MOISTURE FROM THE WESTERN GULF COAST TO THE OHIO VALLEY.  THE
NORTHERN EXTENT OF THIS MOISTURE MAY MANIFEST ITSELF AS FREEZING
DRIZZLE OR LIGHT FREEZING RAIN FROM THE UPPER MIDWEST TO THE
SOUTHERN GREAT LAKES REGION BEFORE WARMER AIR ARRIVES.  FARTHER
SOUTH, SHOWERS AND SOME THUNDERSTORMS WILL LIKELY INCREASE IN
COVERAGE THROUGH THE WEEKEND AS MOISTURE FROM THE GULF OF MEXICO
INTERACTS WITH A DEVELOPING SURFACE LOW OVER THE CENTRAL PLAINS BY
LATE SATURDAY.

AFTER A COLD DAY ON FRIDAY, TEMPERATURES FOR THE EASTERN U.S. WILL
FINALLY START A WARMING TREND BEGINNING ON SATURDAY AND LASTING
THROUGH MONDAY.  THE WARMER SOUTHERLY FLOW WILL ALLOW FOR READINGS
TO REACH THE 40S AND LOW 50S FOR MANY AREAS BY SATURDAY, AND ABOUT
5 TO 10 DEGREES WARMER ON SUNDAY.  SOME ISOLATED TO SCATTERED
SHOWERS AND STORMS ARE ALSO EXPECTED FOR SOUTH FLORIDA THROUGH THE
WEEKEND.

D. HAMRICK


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