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ZCZC MIATWOAT ALL TTAA00 KNHC DDHHMM TROPICAL WEATHER OUTLOOK NWS NATIONAL HURRICANE CENTER MIAMI FL 800 PM EDT SUN SEP 18 2011 FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO... 1. A LOW PRESSURE AREA LOCATED OVER THE CENTRAL TROPICAL ATLANTIC ABOUT 1550 MILES EAST OF THE WINDWARD ISLANDS HAS BECOME BETTER DEFINED DURING THE PAST SEVERAL HOURS. ENVIRONMENTAL CONDITIONS APPEAR FAVORABLE FOR GRADUAL DEVELOPMENT OF THIS DISTURBANCE OVER THE NEXT FEW DAYS AS IT MOVES SLOWLY WESTWARD. THIS SYSTEM HAS A MEDIUM CHANCE...30 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS. 2. SHOWER ACTIVITY HAS DIMINISHED IN ASSOCIATION WITH A SMALL LOW PRESSURE SYSTEM LOCATED ABOUT 1050 MILES EAST OF THE NORTHERN LEEWARD ISLANDS. DEVELOPMENT...IF ANY...OF THIS SYSTEM IS EXPECTED TO BE SLOW TO OCCUR DUE TO UNFAVORABLE UPPER-LEVEL WINDS. THIS SYSTEM HAS A LOW CHANCE...10 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT MOVES WESTWARD AT 10 TO 15 MPH. ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE NEXT 48 HOURS. $$ FORECASTER STEWART NNNN
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