000 AGXX40 KNHC 270637 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 237 AM EDT Thu Jul 27 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... Most of the convective activity from the daytime hours has diminished during the evening and early morning hours. Persistent ridging across the northern Gulf of Mexico, except for a series of weak troughs in the NE Gulf, will maintain gentle winds and seas mainly 2 ft or less N of 22N through the remainder of the week and into the first half of the upcoming weekend. A weak cold front will approach the N central and NE Gulf by the second half of the weekend, with winds increasing and seas building over the NE Gulf as a result. A thermal trough over the NW Yucatan will form each afternoon and move westward across the far SW Gulf through the evening and overnight hours, enhancing winds to moderate to fresh. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Ridging N of the area continues to support fresh to locally strong trade winds over the S central Caribbean, mainly NW of the coast of Colombia and western Venezuela. Buoy observations and recent altimeter satellite data show seas of 5 to 7 ft in the S central Caribbean. Moderate to locally fresh trade winds are noted elsewhere. The strongest winds and seas will remain confined to the S central Caribbean as a weak pressure gradient holds in place through the upcoming weekend into early next week. In the tropical N Atlantic, moderate trades will prevail through the remainder of the week and into the upcoming weekend, along with 4 to 6 ft seas. A surge of fresh trades will follow the passage of a tropical wave by late in the weekend into early next week, building seas to 6 to 8 ft N of 10N. These conditions will also spread across the islands and into the NE Caribbean early next week. ...SW N ATLANTIC INCLUDING THE BAHAMAS... Ridging extending from high pressure in the central Atlantic will support gentle to moderate winds N of 23N through early Friday, with moderate to fresh trades S of 22N. Southwesterly flow around the ridging will increase off NE Florida and N of Grand Bahama throughout the day Friday, as troughing deepens over the Carolinas. Model guidance suggests weak low pressure along a sagging weak front dropping southward from Georgia into northern Florida by the end of the weekend, with the associated front laying down just N of 31N by late Sunday into early next week. The northern extent of a tropical wave may move into zone AMZ127 in the SE waters early next week brining a surge of increasing winds and seas. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Lewitsky. National Hurricane Center.