238 AXNT20 KNHC 250012 TWDAT Tropical Weather Discussion...Corrected NWS National Hurricane Center Miami FL 805 PM EDT Fri Aug 24 2018 Corrected Atlantic Ocean section 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 1800 UTC surface analysis and satellite imagery through 2345 UTC. ...TROPICAL WAVES... A tropical wave is offshore the coast of Africa near 19W from 05N to 20N, moving westward at 15 kt. The wave is in a moist environment, and is supported by 700 mb troughing. Scattered moderate convection is within 120 nm west of its axis from 05N to 07N. Scattered moderate convection is just inland the coast of Africa within 30 nm of 14N16W. A central Atlantic tropical wave has its axis along 48W/49W from 02N-18N, moving westward at 15 kt. The wave is embedded within a very dry and stable environment which is inhibiting significant convection at this time. Only isolated showers are noted within 120 nm either side of the wave axis from 02N to 07N. An eastern Caribbean Sea tropical wave has its axis along 66W south of 18N to well inland S America, moving westward at 10-15 kt. This wave is moving through a very dry and stable environment caused by (SAL) Saharan Air Layer that is spreading westward. It is void of deep convection over the water. Scattered moderate convective clusters are seen over S America from 05N to 09N between 64W and 68W. A western Caribbean Sea tropical wave has its axis along 84W south of 19N, moving westward at 15-20 kt. Scattered moderate isolated strong convection is over much of the eastern and central sections of Honduras and Nicaragua, and extending eastward over the waters from 11N to 15N. Isolated moderate convection is within 60 nm east of the wave from 16N to 19N. ...MONSOON TROUGH/ITCZ... The monsoon trough axis extends from the African coast near 15N17W to 10N24W to 08N29W to 09N35W to low pressure at 08N39.5W. The ITCZ begins at 07N41W and ends just to the east of the wave along 48W/49W. It resumes at 04N49W to inland the coast of S America at 04N51W. Scattered moderate convection is within 60 nm of the low in the NE quadrant, and within 120 nm either side of the trough axis between 32W and 38W. Isolated moderate convection is seen from 04N to 08N between 20W and 27W. ...DISCUSSION... GULF OF MEXICO... Scattered to numerous moderate convection occurring over the interior sections of the Florida peninsula have pushed westward to the far eastern part of the gulf east of 84W and north of 25N. Scattered showers and isolated thunderstorms are over the central and eastern gulf waters from 24N to 26N between 84W and 89W. Scattered moderate convection is over much of the Yucatan Peninsula, while isolated showers and thunderstorms are elsewhere over the area. The pressure gradient across the Gulf supports light winds throughout, with a wind shift along the frontal system. In the upper levels, an upper level high centered over southern Texas near 30N98W is producing NE upper-level winds across the basin. CARIBBEAN SEA... Two tropical waves are moving across the basin. Refer to the section above for details. An upper-level low is centered near the Gulf of Honduras at 17N85W. The low is enhancing scattered showers near the upper-low center, and is enhancing convection over the southwestern Caribbean where upper-level diffluence present there is helping to maintain this activity rather active. Expect strong nocturnal pulses of wind through Sun along the coast of Colombia and Venezuela with seas building to 9 ft. A new tropical wave is forecast to reach 55W on Sun. ATLANTIC OCEAN...Corrected Two tropical waves are moving across the basin. Refer to the section above for details. A stationary front is off the coast of northern Florida along a position from 32N78W to 29N81W. Scattered moderate convection is north of 26N and west of 70W. An upper-level low is centered east of the Bahamas near 24N71W, and is helping to enhance this convective activity. A western Atlantic surface trough extends from 26N64W to 20N66W. Scattered showers and isolated thunderstorms are within 60 nm either side of the trough from 23N to 25N, while isolated showers and thunderstorms are elsewhere within 180-210 nm either side of the trough. Another surface trough is analyzed over the central Atlantic from near 31N38W to 24N40W. An upper-level low is located west of the trough near 28N45W. Scattered showers and isolated thunderstorms are seen from 27N to 31N between 43W and 47W. Isolated showers are noted within 120 nm west of the surface trough from 30N to 32N. Saharan dust and associated dry air is noted mainly east of 60W on GOES-16 GEO color dust imagery. The dust is suppressing convection across most of the tropical Atlantic waters from 15N- 30N. For additional information please visit http://www.hurricanes.gov/marine $$ Aguirre