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455
FXUS01 KWBC 212104
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
403 PM EST FRI NOV 21 2014

VALID 00Z SAT NOV 22 2014 - 00Z MON NOV 24 2014

...A PACIFIC FRONT IS EXPECTED TO MOVE ACROSS THE INTERMOUNTAIN
WEST ON SATURDAY AND THEN BRING INCREASING STORMINESS INTO THE
CENTRAL AND NORTHERN PART OF THE U.S. ON SUNDAY...

THE SHORT-RANGE FORECAST PERIOD BEGINS WITH A FINE AND COOL NOTE
IN THE EASTERN U.S. UNDER THE INFLUENCE OF A LARGE DOME OF HIGH
PRESSURE.  RETURN FLOW FROM THE SOUTH HAS BEEN SLOWLY BRINGING
WARM AND MOIST AIR FROM THE GULF OF MEXICO INTO THE SOUTHERN
PLAINS AND HAS TRIGGERED SCATTERED SHOWERS AND THUNDERSTORMS.  AS
THE HIGH PRESSURE SLIDES OFF THE MID-ATLANTIC COAST DURING THE
WEEKEND, A PACIFIC FRONT WILL BE MOVING THROUGH THE INTERMOUNTAIN
WEST, WHERE WIDESPREAD MOUNTAIN SNOWS CAN BE EXPECTED.  THE SNOW
WILL GRADUALLY BECOME MORE WIDELY SCATTERED IN THE WEST AS THE
FRONT MOVES STEADILY AWAY INTO THE PLAINS ON SUNDAY.  WITH THE
SURFACE FRONT AND THE ASSOCIATED UPPER-LEVEL TROUGH APPROACHING,
MORE MOISTURE WILL BE PUMPED INTO THE DEEP SOUTH WHERE STRONGER
THUNDERSTORMS WILL BECOME POSSIBLE ON SUNDAY.  MORE WIDELY
SCATTERED THUNDERSTORMS COULD DEVELOP IN THE MIDWEST AND WILL MOVE
TOWARD THE OHIO VALLEY.  BY SUNDAY NIGHT, WE SHOULD BE DEALING
WITH A DOUBLE BARREL LOW PRESSURE SYSTEM MOVING INTO THE ENTIRE
LENGTH OF THE MISSISSIPPI VALLEY.  SOMEWHAT COLDER AIR WILL ALSO
MOVE INTO THE NORTHERN PLAINS BEHIND THE LOW.  TEMPERATURES IN THE
EAST WILL CONTINUE TO WARM UP FROM WELL BELOW NORMAL TO NEAR
NORMAL BY SUNDAY ALONG WITH INCREASING MOISTURE. MEANWHILE, RAIN
ASSOCIATED WITH A WARM FRONT SHOULD BE MOVING INTO THE CAROLINAS
BY SUNDAY EVENING.

KONG

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






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