547 AGXX40 KNHC 181753 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 153 PM EDT Sat Aug 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... A surface trough will develop along the Yucatan Peninsula during the late afternoons, then drift westward across the southwest Gulf waters during the overnight hours accompanied by a fresh east to southeast wind shift, with the trough dissipating along 96W during the late mornings. Otherwise, a ridge will dominate the Gulf waters accompanied by a gentle to moderate anticyclonic flow, and seas generally in the 2 to 4 ft range, with the exception of 3 ft or less across the NE and SE parts of the Gulf. Winds will increase to 15-20 kt across the northwest Gulf Sun evening into early Mon morning. The ridge is forecasted to shift south and extend across the central waters during the middle of next week. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Strong nocturnal easterly trades expected along the northwest coast of Colombia and Gulf of Venezuela through the middle of next week. The aerial extent of the trades is forecasted to slightly increase by Tue, with seas building to 9 or 10 ft. A tropical wave along 79W/80W will continue westward across the western Caribbean during the weekend. A second tropical wave along 62W/63W will continue through the east Caribbean this weekend, and across the central Caribbean through Tue. These tropical waves will have little impact in winds and seas. ...SW N ATLANTIC INCLUDING THE BAHAMAS... High pressure of 1022 mb centered near 30N70W extends a ridge across the forecast waters while a trough stretches from 27N65W to 21N67W. Under this pattern, expect a gentle to moderate anticyclonic wind flow N of 23N, and mainly moderate to fresh easterly winds S of 23N, except becoming locally strong along the north coast of Hispaniola during the late afternoon into evening hours. The ridge will persist over the next several days while the trough will drift W or WNW across the forecast waters, reaching the central Bahamas on Mon, and the NW Bahamas on Tue. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 GR. National Hurricane Center.