521
FXUS01 KWBC 162012
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
411 PM EDT FRI OCT 16 2009
VALID 00Z SAT OCT 17 2009 - 12Z SUN OCT 18 2009
A DEEP UPPER LEVEL TROUGH OVER THE EASTERN HALF OF THE LOWER 48
STATES WILL AID IN THE DEVELOPMENT OF A COASTAL LOW PRESSURE
CENTER JUST OFF THE MID-ATLANTIC COAST ON SATURDAY. THE SYSTEM
WILL STREAM ATLANTIC MOISTURE INTO THE MID-ATLANTIC PRODUCING RAIN
OVER THE MID-ATLANTIC AND INTO THE APPALACHIANS WITH SNOW AT THE
HIGHEST ELEVATIONS THROUGH SUNDAY MORNING. THE TRAILING FRONT
WILL LINGER NEAR THE SOUTHERN TIP OF FLORIDA PRODUCING SHOWERS AND
THUNDERSTORMS OVER THE REGION. THE MOISTURE POOLING NEAR THE
BOUNDARY WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER THE
LOWER RIO GRANDE THROUGH LATE FRIDAY NIGHT. THE BELOW AVERAGE
TEMPERATURES WILL REMAIN OVER THE EASTERN HALF OF THE COUNTRY
THROUGH SUNDAY.
MEANWHILE ... A PACIFIC STORM WILL MOVE INLAND OVER THE PACIFIC
NORTHWEST ADVANCING TO THE NORTHERN ROCKIES BY SUNDAY. THE SYSTEM
WILL HAVE A GOOD MOISTURE CONNECTION FROM FRIDAY INTO SATURDAY
AFTERNOON PRODUCING RAIN AND MAYBE A THUNDERSTORMS OVER PARTS OF
THE NORTHWEST. AS THE MOISTURE DECREASES ... THE AREAL COVERAGE
OF THE RAIN WILL TAPER OFF ON SUNDAY. ADDITIONALLY ... IN THE
MIDDLE OF THE COUNTRY ... HIGH PRESSURE OVER THE NORTHERN PLAINS
WILL MOVE SOUTHEASTWARD TO THE LOWER MISSISSIPPI VALLEY BY SUNDAY.
ZIEGENFELDER
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