000 AGXX40 KNHC 031824 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 124 PM EST Sun Dec 3 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 weak frontal boundary is dissipating from northern Florida to near New Orleans while a surface trough persists over the SW Gulf. Gentle to moderate winds are observed over almost all of the basin, with moderate to locally fresh NE-E winds in the SE waters and the Straits of Florida, including also the Yucatan Channel. Seas range between 2 and 4 ft based on buoy observations and the satellite-derived sea height data, except seas of 4-6 ft across the Straits of Florida due to persistent NE winds. The frontal boundary will dissipate today. The trough in the SW gulf will drift westward, and move inland into Mexico tonight. High pressure will build southward over the east-central waters through tonight, then shift eastward Monday. Latest model guidance indicates the next cold front will enter the NW gulf late Tue, then move slowly across the basin Wed. Fresh to strong northerly winds and building seas of 9-10 ft are expected behind the front. A low pressure is forecast to develop along the frontal boundary near 25N95W by Wed night, then move quickly NE, and drag the cold front across the remainder of the Gulf through Fri. Strong northerly winds and rapidly building seas will follow the front, with winds possibly reaching gale force over portions of the west-central and SW gulf waters Thu into Thu night. Frequent gusts to gale force are also possible in the central gulf waters on Thu. Currently, the forecast calls for gale conditions possible across forecast zones: GMZ013, GMZ017, GMZ019, and GMZ023 Thu into Thu night. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Latest ASCAT data and ship observations indicate fresh to strong NE winds south of Cuba, fresh NE winds across the Windward Passage, and fresh to locally strong winds near the coast of Colombia. A surface trough persists in the eastern Caribbean and extends from 18N64W to near Bonaire, Netherlands Antilles. 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 Mon through Wed, with seas building to 10-11 ft by early Wed morning. Fresh NE winds SW of Cuba will strengthen tonight through Tuesday and spread SW over the NW Caribbean. Fresh to locally strong NE nocturnal winds are expected through the Windward Passage tonight through Tue night as high pressure builds eastward in the Atlc. Tropical N Atlantic waters: Gentle to moderate trades and 5-7 ft seas are expected E of the Leeward Islands through Tue, then winds will further increase to 15-20 kt with building seas up to 10 ft in northerly swell Tue night through Thu night. Moderate to fresh winds and seas of 5-8 ft are expected E of the Windward Islands through Wed night. Northerly swell will build seas in the 8-10 ft range on Thu. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A frontal boundary extending from 23N60W to near Puerto Rico will move SE of the area later today. A recent ASCAT pass shows moderate to fresh NE winds north of the front. The front will move SE of the forecast area later today. High pres will generally maintain moderate NE winds over the forecast region through Mon. Strong high pressure located near Bermuda will bring strong easterly winds over much of the central and southern waters Mon night through Wed morning. During this time frame, mainly moderate to locally fresh E-SE winds and seas of 4-7 ft will prevail across the N waters. The high pres will shift eastward later on Wed as a cold front reaches the NW waters. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... .GMZ013...N CENTRAL GULF INCLUDING FLOWER GARDEN BANKS MARINE SANCTUARY... GALE CONDITIONS POSSIBLE Thu into Thu night. .GMZ017...W CENTRAL GULF FROM 22N TO 26N W OF 94W... GALE CONDITIONS POSSIBLE Thu into Thu night. .GMZ019...CENTRAL GULF FROM 22N TO 26N BETWEEN 87W AND 94W... GALE CONDITIONS POSSIBLE Thu into Thu night. .GMZ023...SW GULF S OF 22N W OF 94W... GALE CONDITIONS POSSIBLE Thu night into Fri. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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.