000 AGXX40 KNHC 101809 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 209 PM EDT Thu Aug 10 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... Tropical Cyclone Franklin made landfall last night in the Mexican state of Veracruz near the town of Lechuguillas. Now, it continues to weaken over Mexico. At 10/1500 UTC, the last advisory was issued by National Hurricane Center on this system. Buoy 42055 located near 22N94W was reporting SE winds of 20 kt and seas to 9 ft this morning. Winds and seas will further diminish through the rest of today across the SW Gulf. A surface ridge will meander westward from the Florida Big Bend across the northern Gulf waters through Mon, with a surface high developing along the ridge during the late afternoons as a N to S orientated thermal trough develops over interior Florida during peak heating. A thermal trough will develop over the Yucatan Peninsula during the evenings, move slowly westward during the overnight hours, and dissipate over the SW Gulf by late each morning. A surge of fresh to locally strong winds with seas of 3-5 ft will accompany this trough. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Fresh to locally strong nocturnal trades are expected along the N coasts of Colombia and Venezuela to include the Gulf of Venezuela, resulting in seas to 9 ft propagating W across the SW Caribbean between 11N and 14N. The aerial extent of the fresh to strong trades will increase by Mon as the pressure gradient tightens some between the Atlantic ridge and the Colombian/Panamanian low. At that time, marine guidance suggests fresh to strong winds across the south-central Caribbean with building seas to 10 ft. Mainly fresh winds are forecast across the Gulf of Honduras this evening. A tropical wave passing through the E Caribbean this morning will continue through the Central Caribbean on Fri, then slow somewhat as it continues through the W Caribbean during the upcoming weekend. Expect increasing winds of 20-25 kt and building seas of 7-8 ft across the Tropical N Atlantic forecast zones and the Lesser Antilles by Mon night into early Tue likely due to a tight pressure gradient. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A trough of low pressure over the Bahamas and the Straits of Florida will drift westward over Florida through Fri while weakening. Although development appears unlikely, this system could bring areas of heavy rain to portions of the Bahamas and Florida during the next day or two. Another trough of low pressure located about 250 miles northeast of the northern Leeward Islands will move across the waters north of Puerto Rico on Fri reaching the SE Bahamas on Sat, and the central Bahamas on Sun. Experimental GOES16 continues to show that the center is totally exposed to the west of the deep convection. A weak low pressure of 1015b mb is analyzed along the trough axis near 19.5N60W. Some tropical development of this system is possible by this weekend while the trough moves northwestward over the western Atlantic. Fresh to locally strong winds are expected during the evening hours just north of Hispaniola, including the approach to the Windward Passage. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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.