203 AGXX40 KNHC 180806 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 406 AM EDT Tue Sep 18 2018 Marine Weather Discussion for the Gulf of Mexico, Caribbean Sea, and Tropical North Atlantic from 07N to 19N between 55W and 64W and the Southwest North Atlantic including the Bahamas ...GULF OF MEXICO... Weak high pressure extends across the northern Gulf, supporting light breezes and minimal seas, while a trough extends from the Lower Mississippi Valley into the north central Gulf. A trough, the remnants of Isaac, will move across Yucatan Wed, and then across the southwest Gulf Thu through Fri. Yucatan thermal trough to begin to set up each afternoon-evening starting Thu. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... The remnants of tropical cyclone Isaac have weakened to a trough along 82.5W attm and will move W across the northwest Caribbean through midday Wed before shifting across the Yucatan Peninsula. High pres across the central Atlc will build modestly across the basin behind this trough to bring a return to fresh to strong tradewinds across central portions today. A tropical wave will entering the tropical Atlc waters this morning will move into the eastern Caribbean tonight, move across the central Caribbean Thu, and across the western Caribbean through Sat. Large area of thick SAL is presently following this wave and will dominate areas N of 12N after wave passage. Low lat perturbation behind wave along 41W attm will initiate ITCZ convection as it reaches Windwards and moves across central America Central over the weekend. Atlc high pressure will support fresh to strong tradewinds and building seas across the entire basin by late Wed. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A surface trough snakes from the Turks and Caicos to near 30N61W and will weaken and shift slowly NW through late Tue as a ridge builds from the north central Atlantic to the Bahamas. Deep layered troughing supporting this surface trough will continue to produce active convection SE of trough through Wed before it shifts NNW and then lifts out of area. Low pressure moving off the Carolinas will drag an attendant frontal trough across the waters north of 27N Thu and Fri with a low center developing along 32N to the W of Bermuda late Thu then shifting slowly W through Sun. Have followed EC solution for this, which is in reasonable agreement with UKMET and FV3. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *For detailed zone descriptions, please visit: http://www.nhc.noaa.gov/abouttafbprod.shtml#OWF Note: gridded marine forecasts are available in the National Digital Forecast Database (NDFD) at: http://www.nhc.noaa.gov/marine/grids.php For additional information, please visit: http://www.nhc.noaa.gov/marine $$ .Forecaster Stripling. National Hurricane Center.