000 AXNT20 KNHC 131117 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 717 AM EDT Sat May 13 2017 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 1045 UTC. ...TROPICAL WAVES... An Atlantic Ocean tropical wave is along 38W/39W from 12N southward, moving westward 10 to 15 knots. This wave shows up in shortwave infrared imagery during the last few days. Any nearby convective precipitation is part of the ITCZ. An Atlantic Ocean tropical wave is along 55W/56W from 13N southward, moving westward 15 to 20 knots. Convective precipitation: widely scattered moderate to isolated strong from 11N southward between 53W and 57W. A Caribbean Sea tropical wave is along 65W/66W from 16N southward, moving westward 15 to 20 knots. Upper level SW wind flow is cutting across the area of this tropical wave. Convective precipitation: isolated moderate in the Caribbean Sea from 17N southward between 65W and 70W. ...ITCZ/MONSOON TROUGH... The Monsoon Trough passes through the coastal sections of Senegal and Guinea-Bissau near 13N17W to 06N20W and 04N23W. The ITCZ continues from 04N23W to 04N28W 05N37W and 06N49W. Convective precipitation: widely scattered moderate to strong from 05N southward between 19W and 34W. Convective precipitation: scattered to numerous strong from 04N to 06N between 12W and 13W, and from 02N to 05N between 19W and 26W. Widely scattered moderate to isolated strong from 05N to 08N between 40W and 50W. Isolated moderate to locally strong elsewhere from 10N southward from 60W eastward. ...DISCUSSION... ...THE GULF OF MEXICO... A deep layer trough is digging through the SE sections of the U.S.A., toward the middle Texas Gulf coast. The trough is supporting a cold front that passes through SW Alabama, into the north central Gulf of Mexico, to the coast of Mexico near 23N98W. Comparatively drier air in subsidence is apparent in water vapor imagery from 26N northward from 86W westward. Convective precipitation: widely scattered moderate to isolated strong is from 28N in the water northward between the Florida west coast and 86W. Widely scattered moderate to isolated strong from Mexico to Central America, within 200 nm to 300 nm of the coastlines, from Honduras to 25N in Mexico. Upper level SW wind flow covers the rest of the Gulf of Mexico. This SW wind flow is on the western side of a ridge, that is along 77W/78W. VISIBILITY IN MILES, AND WEATHER...FOR THE COASTAL PLAINS OF THE U.S.A. FROM THE DEEP SOUTH OF TEXAS TO FLORIDA... TEXAS: 1 mile or less with fog in the Deep South, from McAllen and Edinburg eastward to the coast. ALABAMA: rainshowers and thunder in Fort Rucker. FLORIDA: Cross City: light rain has ended for the moment. Punta Gorda: 1 mile or less and fog has cleared up for the moment. Crestview: ...FROM THE ATLANTIC OCEAN FROM 50W WESTWARD, INTO THE CARIBBEAN SEA, INCLUDING THE REST OF THE CARIBBEAN SEA... A middle level-to-upper level trough passes through 32N55W, to 26N57W, into the eastern part of the Caribbean Sea near 14N62W, into northern coastal Venezuela. A cold front is passing through 32N54W to 27N60W, 27N63W, and 29N69W. A stationary front continues from 28N68W beyond 32N73W. Comparatively drier air in subsidence is within 120 nm to 210 nm to the SE of the line 30N50W 22N60W, and then from 22N southward in the Atlantic Ocean and in the Caribbean Sea between 60W and 80W. Convective precipitation: widely scattered moderate to isolated strong within 30 nm to the east of the line that passes through 32N52W 29N54W 26N61W. Rainshowers are possible within 600 nm to the east of the line that passes through 32N46W 24N52W 19N57W 10N63W. The Monsoon Trough is along 10N/11N between 74W in Colombia beyond 86W in NW Costa Rica. Convective precipitation: isolated moderate from 14N southward from 73W westward. 24-hour rainfall totals that are listed for the period that ended at 13/0000 UTC...according to the PAN AMERICAN TEMPERATURE AND PRECIPITATION TABLES...MIATPTPAN/SXCA01 KNHC...are 1.34 in Guadeloupe. ...HISPANIOLA... Middle level-to-upper level NW wind flow is moving across Hispaniola. Comparatively drier air in subsidence is apparent in water vapor imagery in Hispaniola. SURFACE OBSERVATIONS...for Port-au-Prince in Haiti: MVFR. for the DOMINICAN REPUBLIC: Barahona: MVFR. ceiling 1400 feet. few cumulonimbus clouds. Santo Domingo: VFR. La Romana and Punta Cana:VFR. Santiago and Puerto Plata: VFR. The GFS MODEL forecast for 250 mb shows that NW wind flow will move across the area during the first 36 hours to 42 hours. W wind flow and SW wind flow are forecast, at the end of the 48-hour forecast period. An anticyclonic circulation center is forecast to move to the E and eventually toward the SE, from the east central coast of Nicaragua toward the Netherlands Antilles. The GFS MODEL forecast for 500 mb shows that a ridge is forecast to move from the eastern half of Cuba, across Hispaniola, and eventually more eastward into the Atlantic Ocean. Anticyclonic wind flow will move across Hispaniola during the first 24 hours. SW wind flow will move across the area during day two. The GFS MODEL forecast for 700 mb shows that anticyclonic wind flow will move across the area during the first 12 hours or so. SW and S wind flow will follow for about the next 24 hours or so. More anticyclonic wind flow will continue until the end of the 48-hour forecast period. ...THE REST OF THE ATLANTIC OCEAN... Upper level cyclonic wind flow covers the area that is from 16N northward between Africa and 30W. An upper level trough passes through 32N15W to 27N19W to 17N26W. A surface ridge extends from a 1021 mb high pressure center that is near 34N05W, to a 1019 mb high pressure center that is near 33N17W, to a 1021 mb high pressure center that is near 29N32W, to 20N53W. A surface trough is along 27N54W 21N56W 17N61W. A second surface ridge extends from 23N61W, across the Bahamas and Cuba, to 22N87W near the NE coast of the Yucatan Peninsula. High level moisture is moving from the Gulf of Mexico, across Florida, into the Atlantic Ocean, and it covers the area that is from 20N northward from 70W westward. For additional information please visit http://www.hurricanes.gov/marine $$ MT