KEY MESSAGES: 1. Tropical storm conditions are possible across portions of the Lesser Antilles beginning on Friday. Tropical storm watches are currently in effect for Barbados, Dominica, Martinique, and Guadeloupe, and additional watches or warnings will likely be required tonight or on Thursday. 2. Heavy rains from Tammy will begin to affect the northern Windward and Leeward Islands on Friday, spreading into the British and U.S. Virgin Islands and Puerto Rico over the weekend. This rainfall may produce isolated flash and urban flooding, along with isolated mudslides in areas of higher terrain. FORECAST POSITIONS AND MAX WINDS INIT 18/2100Z 13.0N 51.7W 35 KT 40 MPH 12H 19/0600Z 13.1N 53.7W 40 KT 45 MPH 24H 19/1800Z 13.5N 55.9W 50 KT 60 MPH 36H 20/0600Z 14.1N 58.2W 55 KT 65 MPH 48H 20/1800Z 15.0N 60.2W 55 KT 65 MPH 60H 21/0600Z 15.9N 61.7W 55 KT 65 MPH 72H 21/1800Z 17.5N 62.7W 55 KT 65 MPH 96H 22/1800Z 21.4N 63.4W 60 KT 70 MPH 120H 23/1800Z 26.1N 60.2W 60 KT 70 MPH
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