764 AXNT20 KNHC 130444 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 0615 UTC Sun Jul 13 2025 Tropical Weather Discussion for North America, Central America Gulf of America, Caribbean Sea, northern sections of South America, and Atlantic Ocean to the African coast from the Equator to 31N. The following information is based on satellite imagery, weather observations, radar and meteorological analysis. Based on 0000 UTC surface analysis and satellite imagery through 0425 UTC. ...TROPICAL WAVES... An eastern Atlantic tropical wave is along 32W, south of 18N, moving westward at 15 kt. No significant convection is noted near this wave. A central Atlantic tropical wave is along 47W, south of 18N, moving westward at 15-20 kt. Scattered moderate convection is observed south of 13N and between 41W and 51W. The tropical wave previously analyzed in the central Caribbean has been removed based on wave guidance diagnostics and TPW. A western Caribbean tropical wave is along 85W, south of 19N, moving westward at 10-15 kt. Isolated showers and thunderstorms are found south of 21N and west of 82W. ...MONSOON TROUGH/ITCZ... A monsoon trough enters the Atlantic through the coast of Mauritania near 20N16W, continuing southwestward to 12N25W to a 1014 mb low pres near 11N41W and to 12N48W. Scattered moderate convection is present from 03N to 12N and between 33W and 41W. ...GULF OF AMERICA... An upper level low over the NW Gulf produces a few showers over the north-central Gulf waters. A broad subtropical ridge reaches into the Gulf of America, resulting in moderate to fresh easterly winds and seas of 3-5 ft south of 25N and between 87W and 95W. Elsewhere, moderate or weaker winds and slight to moderate seas prevail in the rest of the basin. For the forecast, weak high pressure prevails across the NE Gulf tonight, producing gentle to moderate E to SE winds across much of the rest of the basin. The high will drift slowly westward and into the NW Gulf through Wed. This will allow a broad area of low pressure expected to form across the Atlantic east of Florida, to shift westward across Florida and into the eastern Gulf on Tue, then continue to drift westward into the central Gulf through Thu, accompanied by active weather. Environmental conditions could become marginally conducive for the gradual development of this system by mid to late next week. ...CARIBBEAN SEA... Scattered showers and isolated thunderstorms are evident in the lee of Cuba and in the Windward Passage. Meanwhile, a broad subtropical ridge over the central Atlantic extends into the Caribbean, supporting strong to near gale-force easterly trade winds in the south-central Caribbean. This was confirmed by a recent scatterometer satellite pass. Seas in these waters are 8-10 ft. Moderate to locally fresh easterly breezes and moderate seas are found elsewhere south of 20N. In the rest of the NW Caribbean, moderate or weaker winds and slight to moderate seas prevail. For the forecast, 1021 mb Atlantic high pressure along 70W will shift NE and collapse through Sun morning, leaving a weak Atlantic ridge east of 75W through Mon. High pressure will then build westward across the region and into Florida Tue through Thu. This pattern will continue to support pulsing fresh to strong trades and rough seas across the south-central Caribbean through Tue then expand across much of the central basin late Tue through Thu. Fresh E winds are expected across the Gulf of Honduras through the middle of the week, pulsing to locally strong Sun night. Moderate to fresh winds and moderate seas are expected in the eastern Caribbean through the weekend while gentle to moderate winds and slight to moderate seas will prevail NW portions. ...ATLANTIC OCEAN... An expansive subtropical ridge over the central Atlantic dominates the tropical Atlantic waters. An upper level low is noted between Bermuda and Puerto Rico, sustaining a few showers and thunderstorms. Latest satellite-derived wind data show moderate to fresh easterly winds south of 28N and between 25W and 60W. Seas in these waters are 4-6 ft. A tighter pressure gradient in the eastern Atlantic forces fresh to locally strong N-NE winds north of 19N and east of 25W. Elsewhere, moderate or weaker winds and slight to moderate seas are prevalent. For the forecast west of 55W, 1021 mb Atlantic high pressure near 29N70W will shift NE and collapse through Sun morning, leaving a weak Atlantic ridge along 30N and east of 75W through Mon. High pressure will then build westward across the region and into Florida Tue through Thu. A broad area of low pressure is expected to form over the next several days offshore of the southeastern U.S. coast and build into the waters north of the Bahamas. Environmental conditions could become marginally conducive for the gradual development of this system by mid to late next week as the system moves generally westward across the Florida Peninsula and over the eastern and north- central portion of the Gulf. Regardless of development, active weather is expected over the waters west of 75W late Sun through Tue associated with this system. The pressure gradient between the Atlantic ridge building westward and the area of low pressure will support moderate to fresh SE to S winds across the Bahamas and through the NW zones Tue through early Thu. $$ Delgado
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Page last modified: Sunday, 13-Jul-2025 07:40:11 UTC