000 AGXX40 KNHC 071806 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 206 PM EDT Sun May 7 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... High pressure of 1018 mb located over the north-central Gulf near 27N89W dominates the region, with associated gentle to moderate anticyclonic flow across the forecast waters. Seas have lowered to 3 to 4 ft over the eastern portion of the Gulf as the pressure gradient relaxes and previous generated northwest swell decays. Seas of 2 to 3 ft are noted elsewhere based on a pair of altimeter passes and buoys observations. The high pressure is forecast to slowly shift eastward reaching the NE Gulf waters by late Tuesday night, and remain there through Thursday allowing for moderate to fresh southeast winds to develop over the western Gulf and continue through Thursday. Fair conditions are expected to prevail over the basin under the control of the high pressure. A thermal trough will begin to move offshore the Yucatan Peninsula and move across the SW Gulf at night and into the morning hours. A surge of fresh to locally strong easterly winds and seas in the 6 to 7 ft range will accompany this trough. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... A weakening stationary front extending from eastern Cuba to NE Honduras will dissipate by this evening. Gentle to moderate NE to E winds are observed behind the front with seas of 3 to 4 ft. A band of scattered showers and isolated thunderstorms remains associated with the front. This activity will gradually shift eastward through today, but is expected to begin to diminish this afternoon and tonight as the boundary dissipates. Another area of convection is noted over the south-central Caribbean in association with a trough extending from 16N76W to 10N77W. This trough will drift westward while dissipating. Mainly gentle to moderate trades prevail over the central Caribbean, and moderate to fresh trades are noted per scatterometer data over the eastern Caribbean. Seas are generally under 6 ft across the basin. High pressure over the central Atlantic and low pressure near the coast of Colombia will support moderate to locally fresh trade winds over the central and eastern Caribbean, and Tropical N Atlantic forecast waters through the forecast period. Seas of 6 to 7 ft in northeast swell dominate the majority of the Tropical N Atlantic zones. Long period NE swell will continue to propagate across the Tropical N Atlantic waters through the forecast period, with seas generally under 8 ft. ...SW N ATLANTIC INCLUDING THE BAHAMAS... As of 12Z a cold front extends from 31N68W to eastern Cuba. Mainly gentle to moderate W to NW winds and seas to 8 ft in W to NW swell follow the front. Fresh to strong southerly winds are still noted N of 29N E of front to 65W with seas of 8 to 10 ft. Seas elsewhere over the basin, as observed in recent altimeter passes and in current buoy observations, are in the range of 4 to 7 ft east of the Bahamas, 3 to 5 ft north of the Bahamas west of 77W and 1 to 2 ft southwest of the Bahamas. The northern half of the front will begin to weaken as it slowly moves E reaching from 31N65W to 25N71W early on Monday while the southern part of the front becomes stationary and begings to dissipate by this evening. A weak trough, the remnants of the stationary front, will move E across the far southern waters Monday through Wednesday night. Another cold front, currently located north of area roughly along 32N, will clip the NW waters later today, then begin to weaken as it approaches the first front by tonight. Weak high pressure will build across the area in the wake of these fronts through Thursday bringing diminishing winds and subsiding seas. By late Wednesday, the ridge axis will extend along 27N with the high centered over the NW Bahamas. At that time, expect moderate to locally fresh west winds across the north waters with seas of 4 to 6 ft. Another cold front will brush the NE waters on Thursday. Over the southeastern zones, mainly moderate east to southeast winds with seas in the range of about 4 to 6 ft will prevail through the forecast period. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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.