{"msg": "276\nAXNT20 KNHC 172214\nTWDAT \nTropical Weather Discussion\nNWS National Hurricane Center Miami FL\n0015 UTC Tue Aug 18 2026\nTropical Weather Discussion for North America, Central America\nGulf of America, Caribbean Sea, northern sections of South\nAmerica, and Atlantic Ocean to the African coast from the\nEquator to 31N. The following information is based on satellite\nimagery, weather observations, radar and meteorological analysis.\nBased on 1800 UTC surface analysis and satellite imagery through \n2130 UTC.\n...TROPICAL WAVES...\nA far eastern tropical wave has its axis along 19N. It is moving \nwestward at about 10 kt. Convection previously associated with\nthis wave has diminished this evening\nA central Atlantic tropical wave has its axis near 38W, extending\nfrom 02N to 18N, and moving westward at 10 to 15 kt. No\nsignificant convection is associated with this wave at this time.\nAnother central tropical wave is east of the Lesser Antilles with\nits axis near 58W, south of 20N, moving westward at around 15 kt.\nScattered moderate convection is within 240 nm west of the wave \nfrom 11N to 17N.\nA Caribbean tropical wave has its axis along 77W south of 19N.\nIt is moving westward at about 10 kt. Numerous moderate \nconvection is ahead of the wave axis and over the Nicaragua, Costa\nRica, and Panama offshore waters. \n...MONSOON TROUGH/ITCZ...\nThe monsoon trough axis enters the Atlantic through 17N16W and \ncontinues southwestward to 12N25W to 11N39W, where it transitions\nto the ITCZ, then continues to 11N50W and to 11N57W. No \nsignificant convection is evident aside from the convection \ndiscussed in the Tropical Waves section above.\n...GULF OF AMERICA...\nHigh pressure of 1021 mb, centered offshore Louisiana, dominates \nthe Gulf waters, supporting mainly gentle winds and slight seas. \noffshore the Florida Panhandle moderate W winds have developed in\nassociated with a trough N of the area. Moderate to fresh NE to N\nwinds are over the central and eastern Bay of Campeche due to a \nwestward moving trough that along the west coast of the Yucatan \nPeninsula. Seas to around 6 ft are over the waters where these \nwinds are present. \nFor the forecast, high pressure will prevail across the Gulf \nwaters through the week. A weak pressure gradient will support \nmostly gentle to moderate winds across much of the basin. A \ndiurnally induced surface trough will generate fresh winds N of \nthe Yucatan peninsula early each evening. These winds will spread \nwestward away from the Yucatan at night as the trough migrates \ninto the SW Gulf. Slight to moderate seas are expected through the\nforecast period. \n...CARIBBEAN SEA...\nNumerous moderate convection is noted in the NW basin W of 82W, in\nassociation with the interaction of a tropical wave to the SE and\na surface trough over the Yucatan Peninsula. See the Tropical\nWaves section above for information on further convection caused\nby the tropical wave as well as additional thunderstorms entering\nthe eastern basin in association with a second tropical wave.\nFresh to locally strong trades and rough seas dominate the central\nbasin, with moderate to fresh trades in the eastern and southwest\nbasin, along with moderate seas. In the NW basin, away from\nconvection where locally higher winds and seas are likely, gentle\nwinds and slight seas prevail.\nFor the forecast, the pressure gradient between a ridge N of the \narea and the Colombian low will support fresh to strong winds over\nthe central Caribbean through this evening. The area of high \npressure will then weaken through midweek, loosening the pressure \ngradient with resultant winds diminishing slightly. High pressure \nwill build N of the area once again the second half of the week \ninto the weekend, tightening the pressure gradient, and \nstrengthening winds over the central Caribbean. \n...ATLANTIC OCEAN...\nA cold front extends from a 1010 mb low center north of the area \nnear 35N50W southwestward to 31N51W to 27N60W to 27N70W and \nnorthwestward to 31N74W. East of the front, to about 45W, and N of\n27N, scattered moderate convection and fresh to strong SW winds\nprevail. To the W, south of the boundary to 25N, scattered\nmoderate convection also is ongoing. \n \nThe central and eastern subtropical Atlantic is under the \ninfluence of a 1028 mb high pressure center located north of\nthe Azores. Its related gradient is supporting moderate or weaker\nwinds and moderate seas.\nFor the forecast west of 55W, the aforementioned cold front will \nwill stall and weaken into a trough by Tue. Winds in the vicinity\nof the front will diminish tonight. Otherwise, a weak pressure \ngradient will support mainly light to gentle winds, locally \nmoderate, across much of the area N of 22N through the week. \nModerate to locally fresh winds can be expected S of 22N. \n", "title": "Atlantic Tropical Weather Discussion", "id": "1202371099747614727", "issued": "2026-08-17T00:15:00Z", "wmo": "AXNT20", "source": "NOAA/NWS National Hurricane Center, received via the National Weather Wire Service", "page": "https://hurricane.terrapin.com/text/1202371099747614727"}