000 AGXX40 KNHC 231705 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 105 PM EDT Fri Jun 23 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... Remnant circulation of Cindy exiting the area with winds and seas decreasing across the northern waters. Atlantic ridge will build westward over the northern Gulf through Saturday night as Cindy lifts out. Model guidance shows a weak cold front will approach the northern Gulf coast and briefly stall then sink slowly along the coast Mon and Tue, increasing chances for showers and TSTMS over far northern waters. Elsewhere, an upper low and tropical wave in NW Caribbean will move NW across Yucatan overnight then move WNW across the western Gulf through Sunday, enhancing the convection from the associated surface trough, more likely to occur north of the Bay of Campeche. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... A tropical wave, which includes the dissipated remnants of Bret, is interacting and moving in tandem with an upper low centered over Yucatan near 18N89W to enhance convective activity in the NW Caribbean. A scatterometer pass at 0300 UTC showed 20-25 kt ESE winds south of the Cayman Islands, but the most recent ASCAT pass at 1444 UTC shows much lighter winds in this same area. Marine conditions are expected to improve further tonight as the wave moves west into Central America. Light and variable winds across the SW Caribbean have displaced the Colombian speed max farther north than usual. The mid Atlantic ridge will shift westward this weekend, with max winds off Colombia returning to more typical position of 11-13N between 70-77W, supporting seas to 8-9 ft. A low latitude tropical wave in the SE Caribbean will move westward remaining south of 14N this weekend, while the next energetic wave currently along 46W will move across the tropical N Atlantic waters Saturday and Saturday night, and reach the E Caribbean Sunday. A very large tropical wave exiting Africa will reach the central Atlantic Mon, with a large area of dry Saharan air and extensive dust reducing visibilities expected west of the wave. ...SW N ATLANTIC INCLUDING THE BAHAMAS... High pressure will dominate the region during the next few days, with the ridge axis meandering along 30N through the weekend. A weak cold front will reach near 31N Monday night, helping erode the ridge axis briefly across the NW marine zones late Mon and Tue. Modest strengthening of the mid Atlantic ridge the next couple of days will help maintain fresh trades south of 23N into the southeastern Bahamas through Sunday. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Mundell. National Hurricane Center.