000 AGXX40 KNHC 190817 MIMATS Marine Weather Discussion NWS National Hurricane Center Miami FL 417 AM EDT Sat Aug 19 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 is centered in the N central Gulf near 28N87W with a ridge extending from east to west, maintaining generally light to moderate flow across the basin. Seas remain 1 to 3 ft, with highest seas in the western Gulf. An upper level low over the southeast Gulf near 24N83W is supporting scattered showers and isolated thunderstorms in the eastern Gulf. The upper level low will continue to move WNW while the northern extent of a tropical wave, currently moving through the SE Bahamas, approaches the basin. The tropical wave will enter the SE Gulf tonight, moving across the basin through early next week. Meanwhile, Tropical Storm Harvey currently well southeast of the area entering the eastern Caribbean is forecast to approach the northwest Caribbean and Yucatan Peninsula Tue into Tue night, before emering into the Bay of Campeche Wed. While Harvey will weaken to some extent overland, it is forecast retain minimal tropical storm strength as it moves across the far southwest Gulf through mid week. Please refer to http://hurricanes.gov for more information on Harvey. ...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... Tropical Storm Harvey is about 245 nm south of St Croix in the USVI, and continues to move westward through the southeast Caribbean. Sustained winds are 35 kt with gusts to 45 kt. Minimum central pressure is 1005 mb. Numerous showers and scattered thunderstorms are within 240 nm in the SW semicircle of Harvey. Harvey is expected to continue westward across the central Caribbean through Sun, moving into the northwest Caribbean and approaching the Yucatan Peninsula Tue and Tue night as a strong tropical storm. Harvey will remain a relatively compact system, with an envelope of strong winds and seas 8 to 12 ft within 120 nm of the center on the northern semicircle. Please refer to http://hurricanes.gov for more information on Harvey. Ahead of Harvey, a tropical wave currently moving across central Cuba and across the waters between Cayman Brac and central Panama will follow an upper low across the western Caribbean through early Sun, accompanied by a few showers and thunderstorms across mainly the northwest Caribbean. ...SW N ATLANTIC INCLUDING THE BAHAMAS... A large and well defined upper low centered over the Straits of Florida and southeast Gulf is moving WNW and is supporting isolated convection over portions of the Bahamas and eastern Cuba. The northern extent of a tropical wave is moving through the Cay Sal area of the Bahamas in the wake of the upper level low. Fresh easterly winds follow the tropical wave over the waters S of 22N and W of 70W as noted in a 0230 UTC scatterometer pass. Meanwhile, a ridge extends along roughly 29N. Fresh easterly winds will expand across the waters S of 25N with locally stronger winds near the coast of Hispaniola as Tropical Storm Harvey passes S of the region through early next week. A second feature, an area of active weather approximately 400 nm to the northeast of the Leeward Islands, associated with the northern portion of a tropical wave, will move WNW, eventually reaching the southern and central Bahamas by Sun night. Environmental conditions are expected to be only marginally conducive for development during the next few days due to strong upper level winds. Even so, the low will bring strong winds and building seas to the area S of 25N from Sun through mid week. The ridge along roughly 29N will move little through Sun, then will shift slowly northward early next week, maintaining light to gentle breezes into early next week N of 28N, with short period southeast swell of 4 to 6 ft. $$ .WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone: .GULF OF MEXICO... None. .CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... .AMZ019...CARIBBEAN FROM 15N TO 18N BETWEEN 80W AND 85W... Tropical Storm Warning Sun night. .AMZ021...CARIBBEAN FROM 15N TO 18N BETWEEN 72W AND 80W... Tropical Storm Warning tonight into Sun night. .AMZ029...W CENTRAL CARIBBEAN FROM 11N TO 15N W OF 80W... Tropical Storm Warning Sun night. .AMZ031...CARIBBEAN FROM 11N TO 15N BETWEEN 72W AND 80W INCLUDING COLOMBIA BASIN... Tropical Storm Warning tonight into Sun night. .AMZ033...CARIBBEAN S OF 15N BETWEEN 64W AND 72W INCLUDING VENEZUELA BASIN... Tropical Storm Warning early today into tonight. .SW N ATLANTIC INCLUDING THE BAHAMAS... None. $$ *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 Christensen. National Hurricane Center.