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FXUS01 KWBC 180749
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
348 AM EDT THU SEP 18 2008
VALID 12Z THU SEP 18 2008 - 00Z SAT SEP 20 2008
HIGH PRESSURE OVER THE GREAT LAKES WILL MOVE EASTWARD TO NORTHERN
NEW ENGLAND AND THEN SLIDE OFF THE NORTHEAST COAST OVER THE
ATLANTIC. THIS HIGH WILL BRING A REINFORCING SHOT OF COOLER AIR
OVER THE NORTHEASTERN CORNER OF THE U. S.. OVER THE WESTERN PART
OF THE COUNTRY ... AN UPPER LEVEL RIDGE WILL AID IN KEEPING THE
TEMPERATURES ON THE WARM SIDE FROM THE INTERIOR NORTHWEST TO THE
PLAINS. UNTIL ON FRIDAY WHEN A WEAKENING UPPER LEVEL CLOSED LOW
TRIES TO MAKE INROADS INTO THE RIDGE OVER THE NORTHWESTERN COASTAL
AREAS. THE ENERGY ASSOCIATED WITH THE CLOSED LOW WILL AID IN
TRIGGERING WIDELY SCATTERED SHOWERS AND THUNDERSTORM OVER PARTS OF
THE INTERMOUNTAIN WEST TOO.
MEANWHILE ... AN OLD FRONT OVER THE FLORIDA PENINSULA WILL AID IN
DEVELOPING SHOWERS AND THUNDERSTORMS OVER THE SOUTHERN HALF OF THE
STATE THROUGH FRIDAY. IN ADDITION ... ONSHORE FLOW WILL
CONTRIBUTE TO SCATTERED SHOWERS AND THUNDERSTORMS ALONG PARTS OF
THE SOUTHEAST COASTAL AREA. FURTHERMORE ... A POCKET OF GULF
MOISTURE WILL WORK ITS WAY OVER THE CENTRAL GULF COAST WHILE A
WEAK UPPER LEVEL DISTURBANCE PROVIDES INSTABILITY TO TRIGGER
SHOWERS AND THUNDERSTORMS OVER THE AREA STARTING ON FRIDAY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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