San Juan NWS
Posted by JAC on 8/18/2009, 8:55 am
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
516 AM AST TUE AUG 18 2009

.SYNOPSIS...AT UPPER LEVELS...A LOW PRESSURE WEST OF JAMAICA WILL
MOVE WEST AS HIGH PRESSURE BUILDS OVER THE AREA FRIDAY EXTENDING
WEST AND NORTHEAST FROM PUERTO RICO. THE RIDGE WILL MOVE NORTHWEST
OVER THE WEEKEND AND FORM A HIGH THAT MOVES THROUGH THE FLORIDA
STRAIT MONDAY FROM THE CENTRAL ATLANTIC. AS IT DOES SO LOW PRESSURE WILL
DEEPEN EAST NORTHEAST OF THE LOCAL AREA INDUCING NORTHERLY FLOW.

AT MID LEVELS...HIGH PRESSURE WILL REMAIN ACROSS THE MID LATITUDE
ATLANTIC OCEAN THROUGH THE PERIOD EXCEPT WHEN HURRICANE BILL MOVES
UP INTO THE WESTERN ATLANTIC LATE IN THE WEEK. IT WILL REFORM
ACROSS THE WESTERN ATLANTIC NEXT WEEK WITH A STRONG HIGH PRESSURE
OVER THE CENTRAL ATLANTIC ON MONDAY THAT EXTENDS WEST TO FLORIDA.
THEN MID WEEK NEXT WEEK SEVERAL TROUGHS FORM IN THE TROPICAL ATLANTIC...ONE
NEAR 55 WEST AND ONE NEAR 30 WEST. THESE WILL MOVE WEST DURING THE
REST OF NEXT WEEK...AND MOVE ACROSS THE LOCAL AREA.

AT LOWER LEVELS...HURRICANE BILL WILL MOVE WEST NORTHWEST AND THEN
NORTHWEST TO PASS NORTHEAST OF THE LOCAL ISLANDS. AFTER ITS
PASSAGE...HIGH PRESSURE WILL RIDGE BACK ACROSS FLORIDA AND THE
TRADE WIND FLOW WILL RESUME. A TROUGH WILL PASS THROUGH THE LOCAL
AREA ON THURSDAY OF NEXT WEEK IN THE CURRENT SOLUTION.
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Bill - Waiting for the Turn - ricksterpr, 8/18/2009, 8:51 am
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