000 AGXX40 KNHC 021827 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 127 PM EST Sat Dec 2 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... A weakening frontal boundary extends from the Florida Panhandle to near 26N95W while a surface trough persist over the SW gulf. Gentle to moderate winds are observed over almost all of the basin, with mainly moderate to locally fresh NE-E winds over the far SE waters, and the Straits of Florida. Seas range between 2 and 4 ft based on buoy observations and the latest satellite- derived sea height data, with seas of 4-6 ft across the Straits of Florida due to persistent NE winds. The frontal boundary will dissipate today as it slowly moves southeastward. The trough located over the SW gulf will drift westward, and move inland along the Tamaulipas and Veracruz coast of Mexico on Sun. High pressure will then build southward across the eastern and central waters through Sunday night, then begin to shift eastward on Monday. Latest marine guidance indicates that the next cold front will enter the NW gulf by late Tue, then move slowly across the N and W waters on Wed. Fresh to strong northerly winds and building seas of 9-10 ft are expected in the wake of the front at that time. Then, a low pressure is forecast to possible develop along the frontal boundary near 25N95W on Thu. The low will move quickly NE dragging the cold front across the gulf region through late Fri. Strong northerly winds and rapidly building seas will continue to follow the front, with winds possibly reaching gale force over portions of the W central and SW gulf waters on Fri. Occasional to frequent gusts to gale force may also be possible across the central gulf on Fri. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... The most recent ASCAT data indicates the presence of fresh to locally strong NE winds in the lee of eastern Cuba to about 18N. A surface trough persists over the eastern Caribbean and now extends from 18N64W to 12N68W. This trough will move slowly west and dissipate by Monday night. Moderate to fresh trades over the south-central Caribbean will become fresh to strong and expand in coverage Monday through Tuesday with seas building up to 10 ft by early Tue morning. Fresh NE winds to the SW of Cuba will become strong Sunday night through Tuesday while spreading SW over the NW Caribbean waters. Fresh to locally strong NE winds are expected through the Windward Passage at night begining Sun night through Tuesday night. These stronger winds will be the result of high pressure building eastward over the western Atlc from the eastern United States. Mainly moderate to locally fresh trade winds and seas of 5-7 ft are expected across the Tropical N Atlantic waters through the forecast period. Then, seas are forecast to build to 8 or 9 ft in NE swell Tue night through Wed night as the high pressure located N of area moves toward the central Atlantic Ocean. ...SW N ATLANTIC INCLUDING THE BAHAMAS... Developing low pressure is centered near 26N62W with a surface trough extending SW across the SE waters to near the north coast of Hispaniola. An ASCAT pass provided observations of moderate to fresh N-NE winds north of the trough axis to 31N while an altimeter pass indicated seas up to 9 ft near 24N70W. A ship observation also revealed the presence of 9 ft seas to the N of the trough axis. The low pressure will quickly move NE to near 31N47W by Sun morning. The associated trough will become a cold front and move beyond the far SE waters on Sun. High pres will generally maintain moderate NE winds over the forecast region through Mon. Strong high pressure near Bermuda will bring strong easterly winds over much of the central and southern waters Mon night through Wed morning. The high pres will shift eastward later on Wed as a cold front reaches the NW waters. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... .GMZ013...N CENTRAL GULF INCLUDING FLOWER GARDEN BANKS MARINE SANCTUARY... GALE CONDITIONS POSSIBLE Thu night. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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.