641 AXPZ20 KNHC 090349 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Sat Dec 9 2023 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 0350 UTC. ...SPECIAL FEATURES... Tehuantepec Storm Warning: A strong cold front will move across the Gulf of Mexico Friday, resulting in a gap wind event in the Tehuantepec region beginning Sun morning. Winds will likely reach storm force by Sun night while seas will quickly build to 20 ft. Afterward, gale winds with seas to 12 ft will continue through mid-week. Please read the latest High Seas Forecast and the Offshore Waters Forecast issued by the National Hurricane Center at https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml and www.nhc.noaa.gov/marine/offshores.php for details on the special feature. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 09N84W to 08N87W. The ITCZ extends from 08N87W to beyond 07.5N140W. Scattered moderate convection is noted from 05N to 10N between 105W and 124W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please refer to the SPECIAL FEATURES section above for an upcoming gap wind event in the Tehuantepec region. Surface ridging prevails across the basin. Fresh NW to N winds prevail N of 27N while gentle to moderate winds are noted S of 27N. NW swell is inducing 8 to 12 ft seas N of the Revillagigedo Islands, while near the islands seas are 8 to 9 ft. Light winds and seas of 1 to 3 ft are ongoing in the Gulf of California, with light to gentle winds and seas of 5 to 8 ft in mixed swell for the remainder of offshore waters. Moderate winds are still active over the Tehuantepec area, with seas to 7 ft. For the forecast, long-period NW swell will persist off Baja California and the Revillagigedo Islands through the weekend. Strong winds will develop mainly in the north and central Gulf of California this weekend, producing rough seas. A strong cold front will move across the Gulf of Mexico this weekend, resulting in the development of gale-force winds in the Gulf of Tehuantepec on Sun and storm-force winds Sun night. Gale force winds will prevail thereafter through mid week. Very rough seas are expected in the Tehuantepec region through the gap wind event. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh NE to E winds prevail across the Gulf of Papagayo, with seas of 5 to 7 ft. Light to gentle winds prevail elsewhere over the region. Seas around 5 ft in the Guatemala and El Salvador offshore waters mostly within mixed swell. Offshore Ecuador waters, seas range between 5 to 7 ft primarily in a S swell. For the forecast, fresh to strong NE to E winds will continue to pulse across the Gulf of Papagayo each night through the forecast period. Gentle to moderate breezes will pulse across the Gulf of Panama region through Sat night. ...REMAINDER OF THE AREA... High pressure dominates the waters N of 15N. Fresh to strong trade winds persist south of the ridge, mainly 10N to 25N W of 122W. Seas in this region are 10 to 13 ft, in a mix of seas due to the trade wind flow and long-period NW swell. Gentle to moderate winds and 8 to 10 ft seas are noted elsewhere. For the forecast, surface ridging will prevail across the area through early next week. Large, long-period NW swell will continue to move across the all the forecast waters. Seas to 13 ft are expected from 07.5N to 19.5N and W of 124W through the weekend, while seas of 7 to 11 ft will prevail elsewhere. This swell will gradually decay this weekend. Looking ahead, the next NW 12 ft seas swell event may beginning by the end of next week. $$ Ramos