000 AGXX40 KNHC 200757 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 357 AM EDT Tue Jun 20 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... The broad low pressure of the past few days has lifted northward to over the central Gulf waters, and is now classified as Potential Tropical Cyclone Three centered near 24.4N 89.5W at 03Z moving '' north-northwest or 315 degrees at 7 kt. This system is best described as lop-sided with the very strong gradient being situated to its east. Large clusters of strong convection are observed over much of the eastern Gulf, and over the eastern half of the central Gulf. Tropical storm force winds extend within about 180 nm of the center in the eastern semicircle. The 12 ft sea radii has increased to within about 240 nm of the center in the eastern semicircle as noted in latest altimeter data, and in earlier buoy reports where seas are maxing out up to around 10-16 ft. Elsewhere, latest satellite derived winds and seas along with ship, buoy, and CMAN data show moderate to fresh winds over the northeast Gulf, and gentle to moderate winds over the western Gulf. Winds are fresh to strong over the southeast Gulf outside the tropical storm force winds. Seas elsewhere are in the in range of 7-10 ft outside the 12 ft seas in the eastern Gulf, 6-9 ft between 90W- 95W, and 4-6 ft west of 95W. Seas are lowest in the far SW Gulf where they are in the 3-5 ft. The current forecast is for the Potential Tropical Cyclone to move north-northwest toward Louisiana and is expected to intensify slightly prior to landfall. Large seas will be primarily confined to well east of the cyclone center through much of Wednesday. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Tropical Storm Bret is centered near 10.3N 62.1W at 06Z or about 50 mi west of Trinidad moving west-northwest at 20 kt with a minimum pressure of 1008 mb and with maximum sustained winds of 35 kt with gusts to 45 kt. Bret is forecast to maintain intensity as it reaches near 11.0N 63.7W later this morning, to near 12.1N 67.2W this evening, to near 12.8N 71.1W then weaken to a depression early on Wednesday near 12.8N 71.1W with maximum sustained winds of 30 kt with gusts to 40 kt. Bret is forecast to weaken to post-tropical/remnant low near 13.5N 75.1W by Wednesday evening. The cyclone will be accompanied by trapped fetched waves, with seas reaching to near 16 or 17 ft to the north of the center. Recent altimeter data to the east of Bret provided assistance with extending the 12 ft sea radii out the NE of center, as well as include a new radii of 120 nm to the southeast of the center. Outside of the winds 35 kt winds associated with Bret, latest satellite derived winds and seas along with ship, buoy, and CMAN data depict strong to near gale winds over the northwest Caribbean, and moderate to fresh winds over the remainder of the forecast area. Seas are reaching near 17 ft over the far southwest portion f the tropical north Atlantic waters, and near 11 ft over the northwest Caribbean. The seas over the northwest Caribbean will slowly subside through today. Elsewhere, winds and seas will increase over the central Caribbean through midweek, then diminish toward the end of the week. ...SW N ATLANTIC INCLUDING THE BAHAMAS... High pressure will remain the main feature to dominate the weather pattern across the basin through the forecast period. Latest satellite derived winds and seas along with ship, buoy, and CMAN data depict moderate to fresh winds over the southern waters with light to gentle winds over the northern waters. Outside the Bahamas, seas are in the 4-6 ft range over the southern waters and 3-4 ft over the northern waters. West of the Bahamas, seas in the 3-5 ft range prevail. High pressure will continue to prevail over the forecast waters through the week. Fresh to locally strong winds will prevail over the far southern waters through Tuesday before diminishing. Elsewhere, light to gentle winds will prevail over the northern waters with seas in the 4-6 ft range. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... .GMZ013...N CENTRAL GULF INCLUDING FLOWER GARDEN BANKS MARINE SANCTUARY... Tropical Storm Warning today into Wed night. .GMZ015...NE GULF N OF 25N E OF 87W... Tropical Storm Warning early today into today. .GMZ019...CENTRAL GULF FROM 22N TO 26N BETWEEN 87W AND 94W... Tropical Storm Warning today into tonight. .GMZ021...E GULF FROM 22N TO 25N E OF 87W INCLUDING STRAITS OF FLORIDA... Tropical Storm Warning early today. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... .AMZ033...CARIBBEAN S OF 15N BETWEEN 64W AND 72W INCLUDING VENEZUELA BASIN... Tropical Storm Warning today into tonight. .AMZ035...OFFSHORE WATERS WINDWARD ISLANDS INCLUDING TRINIDAD AND TOBAGO... Tropical Storm Warning early today into today. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Aguirre. National Hurricane Center.