* WHAT...Southwest winds 25 to 35 kt with gusts up to 45 kt and seas 7 to 12 ft. * WHERE...Waters from Mexico Beach to Okaloosa Walton County Line FL from 20 to 60 NM, Waters from Apalachicola to Mexico Beach FL from 20 to 60 NM and Waters from Suwannee River to Apalachicola FL from 20 to 60 NM. * WHEN...Tropical Storm force winds possible from early Monday afternoon until Tuesday evening. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility. Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe conditions.