000 AGXX40 KNHC 131700 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 100 PM EDT Thu Jul 13 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 extends across the northern coastal plains. The ridge will shift NW tonight and Fri, re-orientating from N-NE to SSW across the western gulf waters on Fri night. A broad low level inverted trough, associated with the northern extension of a tropical wave currently over the Yucatan Peninsula and the first of two troughs currently passing W across the Fl Peninsula and the Bahama Channel, is amplifying over the eastern gulf waters. Expect a broad inverted trough over the E gulf tonight, with the trough shifting W-NW on Fri night into Sat, with a N to S orientated trough along 92W on Sat night and the trough inland Tx on Sun. A surface high will develop over the E-central gulf on Sun night into Mon. The result will be light to gentle winds throughout the waters n of 22N. An inverted thermal trough will develop over the Yucatan Peninsula during the late afternoons into the early evening hours, and move W-NW during the overnight hours, and dissipate over the SW Gulf by late each morning. Expect a fresh to locally strong NE-E-SE wind shift tonight with seas to 5 ft, than a moderate wind shift, and seas to 3 ft, is forecast along the trough through Sun night, with guidance hinting at fresh- strong conditions returning on Mon night. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Atlc high pressure continues to weaken resulting in diminishing trades across the S-central Caribbean. Expect strong nocturnal NE trades only within 180 nm of the NW coast of Colombia, and across the Gulf of Venezuela through Sun night, with guidance indicating a more significant event on Mon night. A tropical wave currently along 67W will continue W at 15 kt accompanied by convection to the N of 18N, and will reach the central Caribbean on Fri. A second tropical wave S of 15N along 51W is moving at an estimated 20 kt and will reach the Windwards on Fri, but convection preceding the wave will arrive today. ..SW N ATLANTIC INCLUDING THE BAHAMAS... A broad low level trough will pass W through the Bahama Channel today accompanied by SCT RW/ISOL TS. The N extension of a tropical wave is enhancing consider convection in the Virgin Islands and Puerto Rico area. The associated upper support will shift W in phase with the lower level wave so convection should continue through at least tonight but added in weather grids through the Old Bahama Channel for the next few days. An E to W ridge will rebuild W of the trough over the Bahama channel and meander from Bermuda to Port Canaveral through the weekend. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Nelson. National Hurricane Center.