Prognostic Meteorological Discussion
Issued by NWS

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3

000
FXUS01 KWBC 210830
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
330 AM EST SUN DEC 21 2014

VALID 12Z SUN DEC 21 2014 - 12Z TUE DEC 23 2014

...ACTIVE WEATHER ACROSS THE NORTHWESTERN U.S...

...FRONTAL BOUNDARY ACROSS THE GULF WILL BRING SHOWERS AND
THUNDERSTORMS FOR SEVERAL DAYS IN THE SOUTHEAST...


AN ATMOSPHERIC RIVER IS CONTINUING TO TRANSPORT A PLETHORA OF
MOISTURE INTO THE PACIFIC NORTHWEST AND THE INTERMOUNTAIN WEST.
THIS WILL TRANSPIRE INTO HEAVY RAINS, ESPECIALLY ALONG THE COAST,
AND OROGRAPHIC DRIVEN HEAVY SNOW ACROSS THE CASCADES AND ROCKIES.
A PACIFIC FRONT THAT HAS BEGUN TO MOVE ACROSS NORTHWESTERN
WASHINGTON WILL KEEP PUSHING EASTWARD ACROSS THE REGION WHICH WILL
MAINTAIN ACTIVE WEATHER DURING SUNDAY AND MONDAY.  THERE IS
CONCERN FOR FLASH FLOODING ON SUNDAY ALONG THE COAST OF
WASHINGTON, OREGON, AND NORTHERN CALIFORNIA (SEE THE WPC EXCESSIVE
RAINFALL PRODUCT FOR MORE DETAIL).  IN ADDITION, THE WPC WINTER
WEATHER DESK HAS INDICATED THAT SNOWFALL AMOUNTS BETWEEN 1 TO 2
FEET ALONG THE NORTHERN AND CENTRAL ROCKIES, IN ADDITION TO THE
CASCADES, IS POSSIBLE ON SUNDAY AND INTO MONDAY. AS THE FRONT
MOVES INTO THE CENTRAL U.S. BY MONDAY NIGHT, EXPECT LINGERING
SHOWERS AND SNOW SHOWERS ACROSS THE INTERMOUNTAIN WEST.

A STALLED STATIONARY FRONT ACROSS THE GULF OF MEXICO AND THE
ATLANTIC IS BRINGING SHOWERS AND THUNDERSTORMS TO THE SOUTHEAST.
AS THE FRONT PUSHES NORTH AS A WARM FRONT, PRECIPITATION WILL
SPREAD ACROSS THE TEXAS COASTLINE EASTWARD TOWARD THE COASTLINE OF
THE CAROLINAS.  BY SUNDAY NIGHT, LIGHT TO MODERATE SHOWERS AND
THUNDERSTORMS WILL CONCENTRATE ALONG THE FLORIDA PANHANDLE.  THIS
BAND OF MODERATE PRECIPITATION WILL MOVE EASTWARD ACROSS NORTHERN
FLORIDA ON MONDAY.  BY MONDAY NIGHT AND INTO TUESDAY, SHOWERS CAN
BE EXPECTED ACROSS THE EAST COAST AND MOST OF FLORIDA.

FOR THE MOST PART, TEMPERATURES WILL STAY SLIGHTLY ABOVE NORMAL
FOR THE WESTERN HALF OF THE COUNTRY DURING THE SHORT TERM PERIOD.
PORTIONS OF THE SOUTHERN PLAINS, SOUTHEAST, AND EAST COAST CAN
EXPECT SLIGHTLY COOLER THAN NORMAL TEMPERATURES.


FANNING

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





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.