614 AGXX40 KNHC 200836 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 436 AM EDT Thu Sep 20 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... High pressure will build over the eastern United States through tonight, producing gentle to moderate E to SE breezes and small to moderate seas across the Gulf through Sun. A trough moving slowly westward across the Yucatan Peninsula and SE Gulf will shift westward across the south central Gulf and Yucatan today, and across the southwest Gulf this afternoon through Fri, before dissipating Sat. A high pres ridge will extend from the middle Atlc states SW to the NW Gulf over the weekend to produce generally moderate to fresh easterly wind flow across the basin. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... A tropical wave along 70-71W will move west across the central Caribbean through Fri, and pass west of the area through late Sat into Sun. Strong gusts are possible near showers and thunderstorms associated with this tropical wave as dense SAL directly behind the wave intrudes into the backside of the convection. Meanwhile high pressure building from the central Atlc into the central Bahamas will support moderate to fresh trade winds and building seas across the entire basin today through Fri before diminishing slightly Sat and then more significantly on Sun as pres gradient to the N weakens. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A surface trough reaching from roughly Bermuda to 27N74W has nearly dissipated overnight allowing the central Atlantic ridge to build modestly into the southern Bahamas. Low pressure moving off the Carolinas tonight is dragging a weak early season frontal boundary into the NW waters and will sink SE across the waters north of 27N through Fri. The low will sink to near 29N66W by Sat morning with the front draped across the N of it, then drift W and slowly weaken through Mon. Global models and ensembles have come in line with the EC with 00Z runs but still with EC slightly SW and W of GFS. Have followed EC due to consistency and solution of deep low to develop across NE Atlc this weekend. NE swell will move into the open waters east of the Bahamas Fri through early next week. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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.