Prognostic Meteorological Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3
000
FXUS01 KWBC 270719
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
218 AM EST SAT DEC 27 2014

VALID 12Z SAT DEC 27 2014 - 12Z MON DEC 29 2014

...WHILE SNOW CROSSES THE UPPER MIDWEST...A COLD FRONT WILL
TRIGGER HEAVY RAINS ALONG THE CENTRAL GULF COAST AND SOME
RAIN/SNOW IN WESTERN TEXAS...

...MUCH COLDER WEATHER IS EXPECTED TO  DROP SOUTHWARDS FROM THE
NORTHWEST AND NORTHERN PLAINS ACROSS MUCH OF THE WEST AND CENTRAL
STATES BY EARLY TUESDAY....

...THE UPPER SYSTEM BRINGING VERY COLD AIR SOUTHWARD WILL BRING A
WIDESPREAD AREA OF SNOW ACROSS THE PACIFIC NORTHWEST ACROSS THE
INTERMOUNTAIN WEST AND ROCKY MOUNTAINS IN THE NEXT FEW DAYS.

A COLD FRONT MOVING EASTWARD ACROSS THE CENTRAL UNITED STATES WILL
BE THE FIRST OF AN INCREASING SURGE OF COLDER WEATHER THAT IS
EXPECTED AFFECT AN INCREASING PART OF THE NATION OVER THE NEXT FEW
DAYS.

OVERNIGHT AND INTO SUNDAY, A COLD FRONT WILL BRING COLDER
TEMPERATURES ACROSS THE WEST AND SOME SNOW ACROSS THE UPPER
MISSISSIPPI VALLEY INTO THE UPPER MIDWEST.  AT THE SAME TIME, AN
UPPER DISTURBANCE AND A FLOOD OF LOW LEVEL MOISTURE WILL SPAWN
SIGNIFICANT RAINFALL ALONG THE CENTRAL GULF COAST AND PARTS OF THE
SOUTHEAST US ON SATURDAY AND A SEPARATE BATCH OF HEAVY RAIN COULD
DEVELOP AGAIN ON SUNDAY.

A VERY WINTRY PERIOD FOR PARTS OF THE WESTERN AND NORTHERN US IS
ON THE NEAR HORIZON AS A STRONG WEATHER SYSTEM MOVES ACROSS THE
PACIFIC NORTHWEST ON SATURDAY NIGHT INTO SUNDAY, BRINGING SNOW TO
MANY AREAS EXCEPT THE IMMEDIATE WEST COAST THAT SPREADS INLAND
ACROSS THE INTERMOUNTAIN WEST AND ROCKY MOUNTAINS.  MUCH COLDER
AIR WILL THEN DRIVE SOUTHWARD WITH THE COLDEST AIR HEADED FOR THE
AREA EAST OF THE ROCKIES INTO THE PLAINS STATES ON MONDAY INTO
TUESDAY.  VERY COLD AIR WILL BE MOVING ACROSS MUCH OF THE
INTERMOUNTAIN WEST ON TUESDAY AS A LARGE ARCTIC HIGH PRESSURE
SYSTEM INVADES THE WESTERN US FROM NORTH OF ALASKA.

WHILE THE COLDER AIR WILL ALSO MOVE EASTWARD ACROSS THE MIDWEST
INTO THE NORTHEAST, IT WILL DO SO AT A SLOWER PACE THAN OUT WEST.
WHILE RAIN WILL MOVE EASTWARD ACROSS THE SOUTHEAST INTO THE MIDDLE
ATLANTIC STATES, MOST OF THE PRECIPITATION MAY STAY AS RAIN UNLESS
THE COLDER AIR MOVES FARTHER SOUTH AND THE PRECIPITATION CAN MOVE
FARTHER NORTH.  FOR NOW, WINTER WEATHER SEEMS TO BE KEPT AT BAY
ACROSS MUCH OF THE EAST.

KOCIN


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.