000 AGXX40 KNHC 040810 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 310 AM EST Mon Dec 4 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... Broad high pressure over the eastern U.S. is supporting easterly flow across the eastern Gulf and SE return flow west of 90W. The high will shift eastward today, and a cold front moving into the central U.S. will induce more widespread SE winds in the basin through Tue. A cold front will enter the NW gulf late Tue, then move slowly across the basin Wed and Thu. Fresh to strong north winds and building seas are expected behind the front. Broad low pressure is forecast to develop along the frontal boundary near 25N95W Wed night, then drag the cold front across the remainder of the Gulf as it shifts E-NE into Florida through Sat. 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. Frequent gusts to gale force are also possible in the central Gulf. Currently, the forecast calls for gale conditions possible across forecast zones GMZ017 and GMZ023 Thu into Fri. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Latest ASCAT data and ship observations indicate fresh to strong ENE 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 extending from the ABC Islands to Puerto Rico. This trough will move slowly west and dissipate by early Tue. Moderate to fresh trades over the south-central Caribbean will become fresh to strong and expand in coverage through Wed, with seas building to 10 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. Winds are expected to increase with building seas as well 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 to 8-10 ft on Thu. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A stationary front extending from 23N55W to 21N69W has active convection along the boundary. Scatterometer data shows moderate ENE winds north of the front. The front will gradually become diffuse through Tue. A weak cold front analyzed from 31N71W to 28N78W will dissipate today. High pres building southward along 70W will strengthen easterly winds over much of the central and southern waters tonight through Wed morning. The high pres will shift eastward Wed night as a cold front reaches the NW waters. The slow moving front will extend from 31N75W to central Florida Thu, then become stationary from 31N77W to northern Florida Fri. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... .GMZ017...W CENTRAL GULF FROM 22N TO 26N W OF 94W... GALE CONDITIONS POSSIBLE Thu into Thu night. .GMZ023...SW GULF S OF 22N W OF 94W... GALE CONDITIONS POSSIBLE Thu night into Fri. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Mundell. National Hurricane Center.