476
FXUS01 KWBC 160738
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
338 AM EDT FRI OCT 16 2009
VALID 12Z FRI OCT 16 2009 - 00Z SUN OCT 18 2009
A SERIES OF LOW PRESSURE SYSTEMS RIDING NORTHEASTWARD AHEAD OF
SHARPENING EASTERN U.S. UPPER TROF..PROMISES TO BRING UNSEASONABLY
COOL AND WET CONDITIONS TO MUCH OF THE MID-ATLANTIC REGION..WITH
THE THREAT OF ACCUMULATING SNOWS TO THE INLAND HIGHER TERRAIN
THROUGH MUCH OF THE WEEKEND. THE LEAD SURFACE WAVE SHOULD
CONTINUE ITS NORTHEASTWARD TRACK OFF OF THE NORTHEASTERN SEABOARD.
THOUGH HEAVIER PRECIPITATION SHOULD TEND TO WANE TODAY ACROSS THE
NORTHERN MID ATLANTIC AND NORTHEAST STATES WITH EXITING LOW..THE
NEXT UPSTREAM PIECE OF ENERGY DRIVING SEWD THRU THE OHIO AND
TENNESSEE VALLEYS WILL HELP MAINTAIN MOIST LOW LEVEL EASTERLY FLOW
BEHIND THE EXITING SURFACE WAVE INTO THE MID ATLANTIC..MAINTAINING
PERIODS OF RAIN AND HIGHER ELEVATION SNOWS INTO FRIDAY. THE FINAL
AND MOST SIGNIFICANT PIECE OF ENERGY WILL SHARPEN EVEN FARTHER
SOUTH FRIDAY NIGHT INTO SATURDAY ACROSS THE GULF COAST AND
SOUTHEAST. THIS WILL HELP TO HELP INDUCE ANOTHER SURFACE WAVE
NEAR THE MID ATLANTIC COAST..WITH AN INCREASING NORTHWESTWARD
SURGE OF STEADIER RAINS AND EXPANDING INLAND SNOWS TO PARTS OF THE
MID ATLANTIC REGION BY SATURDAY. THE LONG DURATION POTENTIAL OF
THIS EVENT COULD BRING RECORD EARLY SEASON SNOWS TO PARTS OF THE
INTERIOR MID ATLANTIC.
FARTHER SOUTH..THE SHARPENING UPPER TROF WILL CONTINUE TO PUSH A
COLD FRONT SOUTHWARD INTO THE GULF AND SOUTHERN FLORIDA BY
SATURDAY WITH SHOWERS AND THUNDERSTORMS ACCOMPANYING THE FRONT AS
IT SETTLES SOUTHWARD.
IN THE WAKE OF THIS FRONT...HIGH PRESSURE BUILDING OUT CANADA INTO
THE CENTRAL U.S. WILL BRING MOSTLY DRY CONDITIONS FROM THE ROCKIES
TO THE MISSISSIPPI VALLEY.
IN THE WEST...A LARGE HIGH PRESSURE RIDGE ALOFT WILL SLOWLY BREAK
DOWN ACROSS THE PACIFIC NORTHWEST AS A SERIES OF LOW PRESSURE
SYSTEMS LIFT NORTHEASTWARD ACROSS THE EASTERN PACIFIC. INITIAL
SURFACE LOW WILL TAKE A TRACK TOWARD BRITISH COLUMBIA ON FRIDAY
WITH THE SOUTHERN PORTION OF FRONT STALLING NEAR THE PACIFIC
NORTHWEST COAST. RAIN SHOWERS WILL BECOME MORE NUMEROUS ACROSS
PARTS OF THE PACIFIC NORTHWEST LATE FRIDAY AND SATURDAY AS ANOTHER
SURFACE LOW TAKING A LITTLE MORE SOUTHERN TRACK HELPS FOCUS DEEPER
MOISTURE INTO PARTS OF WESTERN OREGON AND WASHINGTON.
PEREIRA
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