Prognostic Meteorological Discussion
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FXUS01 KWBC 260733
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
233 AM EST FRI DEC 26 2014

VALID 12Z FRI DEC 26 2014 - 12Z SUN DEC 28 2014

...SNOW IS EXPECTED FROM THE ROCKIES ACROSS THE CENTRAL PLAINS,
UPPER MISSISSIPPI VALLEY INTO THE UPPER MIDWEST...

...COLDER AIR IS TO BECOME MORE WIDESPREAD ESPECIALLY ACROSS THE
NORTHERN HALF OF THE NATION WHILE A SIGNIFICANT COLD OUTBREAK
STARTS TO MOVE SOUTHWARD INTO THE PACIFIC NORTHWEST AND NORTHERN
ROCKIES WITH MOUNTAIN SNOW...

...HEAVY RAINS TO DEVELOP OVER THE WEEKEND ALONG THE GULF COAST
AND PARTS OF THE SOUTHEAST...

SNOW WILL CONTINUE ACROSS THE CENTRAL ROCKIES ON FRIDAY AND WILL
SPREAD NORTHEASTWARD ACROSS CENTRAL PLAINS, UPPER MISSISSIPPI
VALLEY AND NORTHERN GREAT LAKES INTO SATURDAY.  COLDER AIR WILL
FOLLOW IN THE WAKE OF THIS SYSTEM AS A COLD FRONT PRESSES SOUTH
AND EASTWARD TOWARD THE WESTERN GULF BY SATURDAY. A WEAK AREA OF
LOW PRESSURE IS EXPECTED TO DEVELOP NEAR THE CENTRAL GULF LATE
SATURDAY AND MOVE NORTHEASTWARD INTO THE SOUTHEASTERN STATES ON
SUNDAY...WITH LOCALLY HEAVY SHOWERS AND THUNDERSTORMS EXTENDING
FROM EASTERN TEXAS ACROSS THE CENTRAL GULF INTO THE SOUTHEAST.
HEAVY RAIN COULD RESULT IN LOCALIZED FLASH FLOODING.

COLDER AIR WILL MAKE ITS WAY SLOWLY EASTWARD ACROSS THE OHIO
VALLEY AND INTO THE NORTHEAST ON SUNDAY AND MONDAY WHILE SOME VERY
COLD AIR BEGINS TO MAKE ITS WAY SOUTH FROM SOUTHERN CANADA INTO
THE NORTHERN PLAINS INTO THE UPPER MISSISSIPPI VALLEY AND NORTHERN
MIDWEST BY EARLY MONDAY.

MEANWHILE...A STORM SYSTEM IS EXPECTED TO MOVE SOUTHEASTWARD FROM
THE NORTHEAST PACIFIC ACROSS SW CANADA INTO THE PACIFIC NORTHWEST
STARTING ON SATURDAY AND CONTINUING SOUTH AND EASTWARD TOWARD THE
NORTHERN ROCKIES ON SUNDAY.  A LARGE ARCTIC HIGH IS EXPECTED TO
FOLLOW IN ITS WAKE FROM NORTHWESTERN CANADA BRINGING MUCH COLDER
AIR ACROSS MANY PORTIONS OF THE PACIFIC NORTHWEST, GREAT BASIN AND
NORTHERN ROCKIES BY EARLY MONDAY. BITTERLY COLD AIR WILL REALLY
MAKE ITS PRESENCE FELT BY EARLY IN THE WEEK ESPECIALLY ALONG THE
EASTERN SLOPES OF THE ROCKIES INTO THE CENTRAL AND NORTHERN
PLAINS, WHERE SUBZERO TEMPERATURES WILL MAKE ITS PRESENCE FELT.

KOCIN


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