San Juan Discussion
Posted by JAC on 7/17/2009, 8:05 pm
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN JUAN PR
346 PM AST FRI JUL 17 2009

.DISCUSSION...
ISOLATED AFTERNOON THUNDERSTORMS DEVELOPED OVER THE WESTERN
INTERIOR AND DRIFTED WESTWARD INTO THE MONA PASSAGE. SHOWERS
REMAINED WIDELY SCATTERED OVER LAND IN GENERAL. WEATHER CONDITIONS
FOR TONIGHT WILL REMAIN UNDER THE INFLUENCE OF MODERATE EAST WINDS
AND ISOLATED PATCHES OF MOISTURE THAT WILL CROSS THE AREA AT
TIMES. FOR SATURDAY MORNING DRY WEATHER IS STILL EXPECTED AND WILL
CONTINUE THROUGH THE AFTERNOON SINCE SUBSIDENCE AND NEGATIVE
VORTICITY ADVECTION ARE AHEAD OF AN APPROACHING MODERATE TROPICAL
WAVE NEAR 55 WEST. LOW LEVEL NORTHEAST WIND FLOW WILL ALLOW FOR
LIMITED CONVECTION ALONG THE WEST SOUTHWEST SATURDAY AFTERNOON.

WEATHER CONDITIONS WILL START TO DETERIORATE ACROSS THE U.S. VIRGIN
ISLANDS SATURDAY NIGHT WITH SHOWERS...A FEW THUNDERSTORMS AND GUSTY
WINDS PREVAILING THROUGH SUNDAY. PUERTO RICO SHOULD ALSO SEE ITS
FAIR SHARE OF WEATHER AS THE TROPICAL WAVE CROSSES THE AREA ON
SUNDAY. THE WAVE TAIL AND ITS RESIDUAL MOISTURE SHOULD LINGER ACROSS
THE AREA THROUGH MONDAY BEFORE THE NEXT AND STRONGER TROPICAL WAVE
NEAR 36 WEST ARRIVES ON TUESDAY. A LARGE TAIL OF MOISTURE IS
EXPECTED TO STAY BEHIND THE SECOND WAVE.

MARINE...A MODERATE TO FRESH EAST TO NORTHEAST TRADE WIND FLOW WILL
PREVAIL ACROSS THE REGIONAL WATERS THROUGH SATURDAY WHICH SHOULD
REQUIRE SMALL CRAFT TO EXERCISE CAUTION. WINDS AND SEAS WILL
INCREASE AFTER THE PASSAGE OF A TROPICAL WAVE LATE SATURDAY/EARLY
SUNDAY.
48
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Two Waves with Character - JAC, 7/17/2009, 7:20 am
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