Tropical Weather Discussion
Issued by NWS
Issued by NWS
381 AXPZ20 KNHC 120327 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Wed Jun 12 2024 Tropical Weather Discussion for the eastern Pacific Ocean from 03.4S to 30N, east of 120W including the Gulf of California, and from the Equator to 30N, between 120W and 140W. The following information is based on satellite imagery, weather observations, radar, and meteorological analysis. Based on 0000 UTC surface analysis and satellite imagery through 0300 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 11N81W to 11N84W to 09N125W to 10N140W. Scattered moderate to strong convection is noted from 05N to 12N E of 91W. Scattered to numerous moderate to strong convection is noted from 06N to 14N between 91W and 100W, and from 06N to 10N between 100W and 109W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... High pressure centered well NE of Hawaii extends a ridge southeastward to near the Revillagigedo Islands. This pattern supports moderate NW to N winds across the Baja offshore waters between Punta Eugenia and the Revillagigedo Islands, and gentle NW winds to the north of Punta Eugenia. Seas are generally 5 to 7 ft in NW swell. Gentle to moderate NW winds prevail across the southern half of the Gulf of California, where seas are in the 2 to 3 ft range, except to 4 ft at the entrance. Gentle to moderate NW winds dominate the remainder of the Mexican offshore waters, except for moderate N to NE gap winds across the Gulf of Tehuantepec. Seas of 5 to 6 ft in SW swell. Scattered to numerous thunderstorms persist across the waters south of 14N, between Chiapas and Guerrero. For the forecast, a broad ridge will dominate the Baja offshore forecast waters through Fri. The high pressure will build toward the area late this week and yield an increase in winds. NW swell will impact waters offshore Baja California at the end of the week, leading to seas of 7 to 9 ft. Thunderstorms offshore Central America will gradually shift NW to the waters of the Gulf of Tehuantepec and offshore southern Mexico through Thu night. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough remains located farther north than its usual position for this time of year, and currently extends from NW Nicaragua across the Pacific offshore waters along 13N to the south of El Salvador and Guatemala. This pattern is forecast to persist through the week, with the potential for the trough to lift farther north and to the waters offshore of Tehuantepec late in the week. The current trough position is resulting in gentle to moderate SW to W winds in the offshore waters of Central America north of 04N, and gentle to moderate S to SW winds between the Galapagos Islands and southwestern Colombia. Seas are generally 5 to 7 ft in SW swell, except 3 to 4 ft inside the Gulf of Panama. Scattered thunderstorms continue across the regional offshore waters N of 05N, and extend across large portions of Central America and into the SW Caribbean. For the forecast, monsoonal winds, associated seas, and scattered to numerous thunderstorms will dominate the region this week. Low pressure is expected to develop across portions of the Yucatan Peninsula, the Bay of Campeche, and western portions of Central America Wed and Thu. This will induce the monsoon trough to lift farther northward toward the Gulf of Tehuantepec, with winds to the west of 90W increasing to fresh to locally strong, leading to building seas to 10 ft. Look for thunderstorm activity to also increase during this time. Fresh to strong SW winds are expected to develop south of Panama Fri and shift into the Gulf of Panama Fri night and Sat. ...REMAINDER OF THE AREA... The NE Pacific ridge has reorganized today, and is now centered on a 1030 mb high near 38N143W. The associated ridge persists over the forecast waters N of 15N and W of 115W, producing a gentle to moderate N to NE wind flow north of the monsoon trough and west of 115W. Gentle to moderate S to SW winds are observed S of the monsoon trough from the Equator to about 08N. Seas are 4 to 7 ft across the entire area in mixed S and NW swell. For the forecast, strengthening high pressure centered NW of the area will dominate waters W of 120W throughout the week. The SW flow south of the monsoon trough is forecast to increase to fresh to strong speeds late tonight into Thu between 90W and 110W, building seas to 8 to 10 ft, and forcing increasing thunderstorm activity across that area. $$ Konarik