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FXUS01 KWBC 111921
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
321 PM EDT SUN OCT 11 2009
VALID 00Z MON OCT 12 2009 - 12Z TUE OCT 13 2009
COLD HIGH PRESSURE OVER THE UPPER MIDWEST WILL MOVE EASTWARD TO
NEW ENGLAND BY MONDAY EVENING THEN OFF THE COAST ON TUESDAY.
ANOTHER COLD AREA OF HIGH PRESSURE WILL ADVANCE SOUTHWARD FROM
WESTERN CANADA ONTO THE UPPER MIDWEST BY TUESDAY. MUCH BELOW
AVERAGE TEMPERATURES WILL BE OVER THE NORTHERN ROCKIES AND THE
NORTHERN/CENTRAL PLAINS THROUGH TUESDAY WHILE BELOW AVERAGE
TEMPERATURES WILL EXTEND FROM THE SOUTHERN PLAINS TO THE
NORTHEAST.
UPPER LEVEL ENERGY MOVING ACROSS THE NORTHERN TIER STATES WILL
TRIGGER LIGHT SNOW FROM THE NORTHERN ROCKIES TO THE UPPER GREAT
LAKES AND TO EXTREME NORTHERN NEW ENGLAND BY TUESDAY. THE
SOUTHERN PART OF THE PRECIPITATION SHIELD WILL BE RAIN AND THAT
WILL STRETCH FROM THE CENTRAL/SOUTHERN PLAINS ACROSS THE MIDDLE
MISSISSIPPI VALLEY EASTWARD INTO SOUTHERN NEW ENGLAND LIKEWISE ...
ON TUESDAY.
AN OLD BOUNDARY ACROSS THE GULF COAST TO THE SOUTHEAST WILL AID IN
DEVELOPING SHOWERS AND THUNDERSTORMS FROM THE WESTERN GULF COAST
TO THE SOUTHEAST. A WAVE OF LOW PRESSURE WILL MOVE ALONG THE
FRONT FROM THE CENTRAL GULF COAST TO THE CAROLINAS INCREASING THE
AREAL COVERAGE OF THE SHOWERS AND THUNDERSTORMS INTO THE TENNESSEE
VALLEY AND THE SOUTHERN MID-ATLANTIC MONDAY AND TUESDAY. ALSO THE
CONTINUED NORTHERLY FLOW OF GULF MOISTURE OVER THE WESTERN GULF
COAST/SOUTHERN PLAINS WILL PRODUCE SHOWERS AND THUNDERSTORMS
INLAND OVER PORTIONS OF THE SOUTHERN PLAINS/LOWER MISSISSIPPI
VALLEY ON TUESDAY.
FURTHERMORE ... AN APPROACHING PACIFIC STORM WILL BEGIN TO PRODUCE
RAIN ALONG THE WEST COAST ON TUESDAY AND SNOW INLAND OVER PORTIONS
OF THE NORTHERN INTERMOUNTAIN REGION/GREAT BASIN ON TUESDAY.
ZIEGENFELDER
GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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