000 ABNT20 KNHC 202334 TWOAT TROPICAL WEATHER OUTLOOK NWS NATIONAL HURRICANE CENTER MIAMI FL 800 PM EDT TUE SEP 20 2011 FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO... SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THE LARGE LOW PRESSURE SYSTEM LOCATED ABOUT 1400 MILES EAST OF THE WINDWARD ISLANDS CONTINUE TO SHOW SIGNS OF ORGANIZATION...BUT RECENT SATELLITE IMAGERY INDICATES THAT THIS SYSTEM DOES NOT YET HAVE A WELL-DEFINED CIRCULATION CENTER. CONDITIONS ARE EXPECTED TO REMAIN CONDUCIVE FOR A TROPICAL DEPRESSION TO FORM IN THIS AREA TONIGHT OR WEDNESDAY... AND THIS SYSTEM HAS A HIGH CHANCE...70 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT MOVES WESTWARD AT 5 TO 10 MPH. A SMALL AREA OF LOW PRESSURE LOCATED ABOUT 300 MILES EAST OF THE NORTHERN LEEWARD ISLANDS IS PRODUCING DISORGANIZED SHOWER AND THUNDERSTORM ACTIVITY. UPPER-LEVEL WINDS ARE NOT FAVORABLE FOR DEVELOPMENT OF THIS SYSTEM...HOWEVER THIS LOW COULD BRING A BRIEF PERIOD OF RAINFALL AND GUSTY WINDS TO PORTIONS OF THE NORTHERN LEEWARD ISLANDS ON WEDNESDAY AS IT MOVES WESTWARD AT 15 TO 20 MPH. THIS SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS. ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE NEXT 48 HOURS. $$ FORECASTER BRENNAN