Hurricane and Tropical Cyclones
Tropical Weather Discussion
000 axnt20 knhc 252345 twdatTropical weather discussion NWS National Hurricane Center Miami FL 744 PM EDT Tue Apr 25 2017Tropical 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 1800 UTC surface analysis and satellite imagery through 2330 UTC....ITCZ/monsoon trough...The monsoon trough extends SW from the coast of western Africa at 09n13w to 00n19w. The intertropical convergence zone continues from 00n19w to 04s27w to the coast of Brazil near 00n47w. Isolated showers are observed within 100 nm on either side of the boundaries between 25w-42w....Discussion...Gulf of Mexico...Weak high pressure ridges northwestward from the western Caribbean across the eastern and central Gulf. The western portion of the basin is dominated by a broad surface trough with axis along the eastern Mexico coast. Scatterometer data depicts light to gentle anticyclonic winds over the east and central Gulf waters east of 92w while moderate to fresh southerly winds are prevailing west of 92w. The high pressure ridge will drift eastward as a cold front approaches the northwest Gulf from Texas on Wednesday morning. Return flow over the northwest Gulf will increase as the cold front approaches, with south winds over the western Gulf becoming fresh to strong by early Wednesday. The front will then enter the western portion of the basin on Wednesday night.Caribbean Sea...A 1014 mb high is located near 22n83w. To the east, a surface trough extends from 14n73w to the Colombian low centered near 09n70w. No significant convection is observed at this time. Scatterometer data depicts moderate trades over the eastern Caribbean east of 70w while light to gentle winds prevail elsewhere. The trough is expected to lift northeast during the next 24 hours. Winds will remain light to moderate....Hispaniola...Divergent upper-level flow prevails across the island supporting isolated showers. This activity will dissipate overnight. The upper-level trough that is supporting the diffluence aloft will move northeast through the next 24 hours allowing for the atmospheric conditions to stabilize across the island.Atlantic Ocean...A cold front enters the discussion area near 31n73w to 25n75w then becomes weak to 23n79w. A surface trough extends east of the front from 30n72w to 22n69w. To the east of the trough, a diffluent flow aloft supports scattered light to moderate convection north of 22n between 62w-68w. Ridging prevails over the central Atlantic between low pressure system over the Carolinas and a broad area of low pressure centered northeast of the Canary Islands near 35n24w. The low system over the Carolinas is expected to head northeast during the next 24 hours while the ridge over the central Atlantic and low system near the Canary Islands will remain in place. This will maintain similar weather conditions in these areas. As the cold front moves slowly east int he west Atlantic, it will continue to weaken and eventually dissipate by Wednesday evening.For additional information please visit http://www.Hurricanes.Gov/marine$$Era
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