829
FXUS01 KWBC 292055
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
453 PM EDT MON SEP 29 2008
VALID 00Z TUE SEP 30 2008 - 12Z WED OCT 01 2008
..GREAT LAKES/MIDWEST/UPPER OHIO VALLEY AND NEW ENGLAND
A SLOW-MOVING TROUGH OF LOW PRESSURE MIGRATING ACROSS CENTRAL
CANADA WILL STALL OVER SOUTHWESTERN QUEBEC ON TUESDAY AND ALLOW
TWO SEPARATE SURGES OF CANADIAN AIR TO MOVE INTO THE REGION
BETWEEN TONIGHT AND WEDNESDAY MORNING. THE FIRST COLD FRONT IS
EXPECTED TO GENERATE SHOWERS AND A FEW THUNDERSTORMS TONIGHT
ACROSS MICHIGAN AND NORTHERN PORTIONS OF INDIANA AND OHIO BEFORE
WEAKENING ACROSS WESTERN PENNSYLVANIA ON TUESDAY MORNING. A
SECOND...MUCH COLDER FRONTAL BOUNDARY IS EXPECTED TO MOVE RAPIDLY
ACROSS ALL THE AREA AND INTO NORTHERN NEW ENGLAND BY TUESDAY
NIGHT. THIS SECOND FRONT WILL BRING PERIODS OF RAIN...RAIN SHOWERS
AND A FEW THUNDERSTORMS TO THE UPPER GREAT LAKES...THE UPPER OHIO
VALLEY...AND SPREAD PRECIPITATION AND COLDER AIR EASTWARD INTO NEW
YORK...VERMONT AND MUCH OF NEW ENGLAND BY WEDNESDAY MORNING.
..LOWER OHIO VALLEY/MID ATLANTIC
A COLD FRONT WILL BRING A SHOT OF COOLER...AUTUMN AIR FROM NORTH
CENTRAL CANADA AND SCATTERED SHOWERS TO THE LOWER OHIO VALLEY
STATES OF KENTUCKY AND WEST VIRGINIA...REACHING THE WESTERN MID
ATLANTIC STATES BY LATE TUESDAY NIGHT AND WEDNESDAY MORNING. THE
COLD FRONT COULD TOUCH A FEW THUNDERSTORMS ACROSS CENTRAL
APPALACHIA AND GENERATE SCATTERED SHOWERS ALONG THE 1-95 CORRIDOR
FROM VIRGINA TO THE PENNSYLVANIA/NEW JERSEY BORDER ON WEDNESDAY
MORNING.
..FLORIDA
A BROAD AREA OF LOW PRESSURE DRAPED ACROSS THE SOUTHERN GULF OF
MEXICO WILL BRING A WEAK DISTURBANCE IN THE YUCATAN NORTHEASTWARD
AND ACROSS CENTRAL/SOUTHERN FLORIDA ON TUESDAY NIGHT AND WEDNESDAY
MORNING. THE BULK OF THE WEATHER ASSOCIATED WITH THIS WEAK
DISTURBANCE WILL BE IN THE FORM OF STRONG SHOWERS...THUNDERSTORMS
AND LOCALLY HEAVY RAINFALL.
..PACIFIC NORTHWEST
DEEPENING LOW PRESSURE IN THE GULF OF ALASKA WILL MOVE SLOWLY
SOUTHEASTWARD ON TUESDAY AND BRING A WARM FRONT...MODERATE SOUTH
TO SOUTHWEST FLOW AND CONSIDERABLE CLOUDINESS TO PORTION OF
WASHINGTON AND OREGON BY THE END OF THE FORECAST PERIOD ON
WEDNESDAY MORNING.
VOJTESAK
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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