192
FXUS01 KWBC 151957
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
356 PM EDT THU OCT 15 2009
VALID 00Z FRI OCT 16 2009 - 12Z SAT OCT 17 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 LIFT
RAPIDLY NORTHEASTWARD AND OFF THE EASTERN SEABOARD THURSDAY NIGHT
. THOUGH HEAVIER PRECIPITATION SHOULD TEND TO WANE 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
ON 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 POTENTIAL
LONG DURATION OF THE 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 FL BY SATURDAY
WITH SHOWERS AND THUNDERSTORMS ACCOMPANYING THE FRONT AS IT
SETTLES SOUTHWARD.
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.
SULLIVAN
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