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000 FXUS62 KMFL 200807 AFDMFL AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 407 AM EDT SAT SEP 20 2008 DISCUSSION...A WEAKENING UPPER TROUGH OF LOW PRES TO THE NE OF S FLA WILL CONTINUE TO MOVE NE LEAVING THE AREA BETWIXT A LARGE ATLC RIDGE EXTENDING FROM THE CENTRAL ATLC SW OVER HISPANIOLA...AND AN UPPER TROUGH OVER THE U.S. THAT EXTENDS FROM THE GREAT LAKES SW INTO THE LOWER MS RIVER VALLEY. THIS PERSISTS THROUGH SUN. THE CONTINENTAL UPPER TROUGH DISSIPATES AND AN UPPER RIDGE...NOW EXTENDING FROM THE DESERT SW ACROSS THE SOUTHERN GREAT PLAINS THEN NE INTO THE GREAT LAKES...WILL MON THROUGH THU. A TROUGH DEVELOPS TO THE E OF THE U.S. RIDGE AND DIGS SOUTHWARD ALONG THE U.S. E SEABOARD WITH A CLOSED UPPER LOW DEVELOPING OVER THE ATLC OFF OF THE CAROLINAS TOWARD MID -WEEK. FOR THE SHORT TERM...TODAY THROUGH MON...S FLA WILL BE A LITTLE DRIER THAN NORMS TODAY AS S FLA STILL UNDER THE EFFECT OF DRY AIR ALOFT AS A WEAK SHORT WAVE RIDGE MOVES OVER THE AREA IN THE WAKE OF THE UPPER TROUGH PULLING/DISSIPATING TO THE NE. AS THE TROUGH MOVES NE...AN INVERTED SURFACE TROUGH ASSOCIATED WITH THE SYSTEM TO THE E OF S FLA MOVES OVER S FLA LATE SUN INTO MON WITH AN INCREASE IN MOISTURE AND CHANCES OF RAIN. MAX TEMPS NEAR NORMS BUT E COAST MIN TEMPS A TAD BIT ABOVE. .EXTENDED PERIOD...TUE THROUGH FRI...S FLA REMAINS IN THE COL BETWEEN THE CONTINENTAL RIDGE AND THE ATLC RIDGE. THUS SOME UPPER INSTABILITY WITH AMPLE ATMOSPHERIC MOISTURE COMBINE TO KEEP S FLA IN A SITUATION OF MAINLY AFTERNOON SHOWERS AND THUNDERSTORMS INTERIOR AND W WITH MAINLY E COAST NOCTURNAL ACTIVITY. && .MARINE...NE/E WINDS AROUND 10 KNOTS WITH SEAS 2 TO 4 FEET TODAY THROUGH SUN NGT. SEAS 4 FEET OR LESS EXCEPT SEAS TO 5 FEET OFF OF PALM BEACH COUNTY AS 2 TO 3 FOOT SWELLS GENERATED BY THE LOW PRES E OF JAX IMPACT THE LOCAL AREA WATERS. WAVES AND SWELLS DECREASE MON. && .FIRE WEATHER...NO CONCERNS WITH RH REMAINING ABOVE CRITICAL VALUES. && .PRELIMINARY POINT TEMPS/POPS... WEST PALM BEACH 88 78 89 76 / 30 30 50 30 FORT LAUDERDALE 89 80 88 77 / 30 30 40 30 MIAMI 89 78 89 77 / 30 30 40 30 NAPLES 90 74 91 74 / 30 20 40 30 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. && $$ LONG TERM...15/JR SHORT TERM/AVIATION...04/AT