000 AGXX40 KNHC 261909 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 309 PM EDT Tue Jun 26 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 extending across the northern gulf will shift slowly southward through Fri. A weak surface trough extending from near 30N88W to 23N93W will weaken as it moves across the remainder of the central gulf and across the eastern section of the western gulf through Wed. A trough moving off the W coast of the Yucatan Peninsula each night will enhance nocturnal winds over much of the southwestern gulf waters through Sun. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Two tropical waves, one is along 83W S of 21N, and the other one is along 72W both to the S of 19N. The wave along 83W will move west of the Caribbean and inland central America on Wed, while the wave along 72W will move inland central America and the Yucatan Peninsula by Fri evening. A rather vigorous tropical wave will track across the tropical North Atlantic Sat and Sat night and over the eastern Caribbean Sun and Sun night. Moisture guidance from the latest GFS model guidance indicates that this wave will be attendant by high moisture content as well a NE to SE wind shift of mainly fresh intensity. The pressure gradient between high pressure present over the western Atlantic and lower pressures over S America and the Caribbean, in conjunction with the increased gradient between the waves and the high pressure, will continue to strong trades over these forecast waters, reaching to near gale force off the coast of Colombia at night and into the early morning hours. Wave model guidances suggest that seas will build to a maximum of 15 ft in the S central part of the sea from about 11N-13N between 75W-77W Wed through Thu before slowly subsiding to around 12 ft Fri to 10-12 ft Fri through Sun night. Outside the fresh to strong trade coverage, generated NE-E swell producing seas of 8-11 ft will reach as far as 83W by Wed and continue through early Fri, then slowly subside to 9 ft thereafter. Numerous strong convection observed in a large cluster has fired up again over the southwestern Caribbean south of 14N and west of 78W. This activity will pulse down to slightly weaker intensity and back up to numerous strong during the forecast period as the eastern part of the Pacific monsoon trough protrudes into the far southwestern Caribbean. ...SW N ATLANTIC INCLUDING THE BAHAMAS... Scattered showers and isolated thunderstorms are near and over the central Bahamas and Andros Island. This activity has diminished in coverage during the afternoon, and will slowly move west-southwestward through tonight. High pressure extending from the central Atlc to southern Florida will maintain moderate to fresh trade winds S of 22N, except fresh to strong N of Hispaniola at night through the period. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Aguirre. National Hurricane Center.