000 AGXX40 KNHC 120743 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 343 AM EDT Wed Jul 12 2017 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... An E to W ridge will extend from near the Fl Big Bend to near the NE TX coast through Thu. The ridge will re-orient, and extend SE from the NE TX coast to the Yucatan Peninsula on Fri, then shift westward while weakening on Sat. The weak inverted trough that had been enhancing TSTMS over the waters N of 25N and E of 90W has dissipated. A tropical wave entering the eastern Pacific from Central America will provide the impetus for isolated thunderstorms over the Bay of Campeche today. An inverted thermal trough will develop over the Yucatan Peninsula during the late afternoons into the early evening hours, then move WNW during the overnight hours. The troughs will dissipate over the SW Gulf by late morning, all the while accompanied by a moderate to fresh winds veering from NE-E-SE, and seas to 5 ft. A surface trough will move W across the E gulf from Florida on Fri and reach the central gulf on Sat. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... A tropical wave currently along 81W will continue heading W and reach the NW Caribbean tonight and Thu. The wave has no significant convection associated with it but will be accompanied by a brief NE-E moderate-fresh wind shift. Atlc high pressure to the N of the area will gradually weaken this week, resulting in diminishing trades across the S-central Caribbean. Expect strong nocturnal NE trades only within 60 nm of the NW coast of Colombia, and across the Gulf of Venezuela late this week. A second tropical wave is approaching the Windward Islands along 60W. The wave is triggering isolated thundershowers near 15N60W, and will enter the eastern Caribbean today and the central Caribbean on Thursday. Another tropical wave currently over the central Atlc is expected to reach the Windward Islands on Friday. ..SW N ATLANTIC INCLUDING THE BAHAMAS... An E to W ridge extending from Bermuda to extreme NE Fl is shifting W as a broad low level trough currently between 65W-77W shifts W. The trough is accompanied by patchy areas of scattered showers and isolated thunderstorms. which should affect the Bahamas through Thu. Expect moderate NE flow, and 2-4 ft seas, within 240 nm W of the trough axis. Fresh E-SE winds and 4-6 ft seas can be expected within 300 nm E of the trough axis. The ridge will rebuild from Bermuda to Port Canaveral Fri night through Sun. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 McElroy. National Hurricane Center.