000 AXNT20 KNHC 241156 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 756 AM EDT Sun Jun 24 2018 Tropical Weather Discussion for North America, Central America Gulf of Mexico, Caribbean Sea, northern sections of South America, and Atlantic Ocean to the African coast from the Equator to 32N. The following information is based on satellite imagery, weather observations, radar and meteorological analysis. Based on 0600 UTC surface analysis and satellite imagery through 1115 UTC. ...TROPICAL WAVES... The axis of a tropical wave is near the west coast of Africa along 19W from 03N to 18N. Scattered moderate convection associated to this wave is noted from 07N to 10N between 19W and 21W. The axis of a tropical wave is near 51W from 03N to 19N, moving W at 20 kt. Scattered moderate convection is noted where the wave meets the ITCZ from 06N to 08N between 50W and 55W. The axis of a tropical wave is over the eastern Caribbean along 63W from eastern Venezuela northward to the Leeward Islands, moving W at 20 kt. Scattered showers are near the wave's axis. The axis of a tropical wave extends from eastern Cuba to eastern Panama. This wave, is interacting with an upper level trough extending across the SE Bahamas to the central Caribbean, and will enhance convection over Cuba today. Another tropical wave is near 89W, and extends over the Yucatan Peninsula and Guatemala into the eastern north Pacific region. This wave in conjunction with an upper level low spinning over the west-central Gulf of Mexico will continue to support convection over SE Mexico and the SW Gulf of Mexico. ...MONSOON TROUGH/ITCZ... The monsoon trough extends off western Africa near 18N16W to 10N23W to 06N30W. The ITCZ continues from 06N30W to 05N50W to the coast of Guyana near 07N58.5W. Outside of the convection associated with the tropical waves, scattered moderate convection is noted within about 120 nm N of the ITCZ axis W of 35W. ...DISCUSSION... GULF OF MEXICO... An upper-level low centered near 21N98W is helping to induce some shower and tstm activity across the SW Gulf as well as portions of SE Mexico. The low will drift westward through Sun night, and continue to enhance convection across this area. Weak ridge extending from the southeast Gulf waters to Texas will drift to over the northern Gulf early next week, supporting moderate to fresh SE return flow over the northwestern Gulf. A trough moving west off the western coast of the Yucatan Peninsula each night will further enhance overnight winds over much of the southwestern Gulf waters. CARIBBEAN SEA... Two tropical waves are propagating across the area, one moving across the central Caribbean, and another tropical wave is moving across the eastern Caribbean. Please, see Tropical Waves section for more details. Expect increasing showers and isolated thunderstorms in association with the passage of these tropical waves. Fresh to strong winds prevail across the central and eastern Caribbean, as well as the Gulf of Honduras, with gentle to moderate winds prevailing elsewhere. Winds will reach near gale force off Colombia at night. Little change is expected through the middle of the week. Areal coverage of fresh to strong trades will decrease afterwards as high pressure north of the area weakens. Seas are forecast to build to 10-12 ft over the south- central Caribbean with the strongest winds. Nocturnal winds will pulse to fresh to strong winds the next couple of nights in the Gulf of Honduras. ATLANTIC OCEAN... High pressure of 1027 mb centered near 31N51W extends a ridge westward across the forecast area. Fresh to locally strong trade winds prevail along the southern periphery of the ridge, S of 20N W of 40W. This high pressure will slowly shift westward tonight, then remain nearly stationary near 30N55W while weakening through Tue night. The weakening of the area of high pressure will loosen the pressure gradient, with diminishing winds and subsiding seas E of the Lesser Antilles toward the middle of the week. Nocturnal winds will continue to pulse to fresh to strong the next several nights off Hispaniola. For additional information please visit http://www.hurricanes.gov/marine $$ GR