000 AXPZ20 KNHC 210324 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Sun Mar 21 2021 Tropical Weather Discussion for the eastern Pacific Ocean from the Equator to 32N, east of 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. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: A ridge across the eastern slopes of the Sierra Madre mountains in Mexico supports gale force winds across the Tehuantepec region. Northerly winds of 30-40 kt are expected through Sun morning with seas in the 10 to 15 ft range. Winds are forecast to diminish below gale force by Sun evening, with seas subsiding to 8-10 ft. Please read the latest NWS High Seas Forecast from the National Hurricane Center at the website: www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from a 1009 mb low pressure located over northern Colombia near 10N74W to 04N90W. The ITCZ continues from 04N90W to 03N120W to 04N140W. Scattered moderate convection is within about 180 NM N of the ITCZ axis between 120W and 140W. As it is normal for this time of the year, a second ITCZ is south of the equator and extends from 02S92W to 02S105W to 01S115W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale Warning remains in effect for the Gulf of Tehuantepec. Please see the Special Features section above for details. High pressure dominates the offshore forecast waters of Baja California. The pressure gradient between this system and lower pressures over the SW CONUS results in fresh to strong NW winds across the waters N of Punta Eugenia. As high pressure strengthens in about 24 hours, these winds will spread SE reaching the waters N of Cabo San Lazaro by Sun evening. Seas 8 to 11 ft in NW swell currently dominate the waters N of Cabo San Lazaro. This swell event will continue to propagate southward reaching the Revillagigedo Islands by Sun evening. Mainly light and variable winds are expected in the northern Gulf of California through Tue, while moderate to locally fresh northerly winds are forecast elsewhere across the Gulf. Strong to gale force westerly winds are expected over northern Mexico E of the Sierra Madre Occidental on Mon, with fresh to strong winds by Mon night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Fresh to strong winds are expected in the Gulf of Papagayo and downwind to about 90W through Mon night. Seas will build to 8-10 ft. Fresh N winds are expected in the Gulf of Panama at night through Mon night. Large seas from strong winds in the Gulf of Tehuantepec will spread into the offshore waters of Guatemala and El Salvador through Sun. Light to gentle winds will prevail elsewhere. REMAINDER OF THE AREA... A strong high pressure system will remain N of 30N over the next couple of days extending a ridge over the northern forecast waters. The pressure gradient between the ridge and lower pressures in the vicinity of the ITCZ will support a large area of fresh to strong NE winds covering the waters from from 17N to 28N W of 130W, and from 17N to 26N between 120W and 130W by Sun evening, and from 14N to 26N W of 128W by Mon evening. Seas will build to 9-12 ft. The aerial extent of these winds will diminish on Tue as high pressure located N of the area weakens some. Long period NW swell are propagating across the forecast waters W of 115W, and will mix with cross equatorial SW swell over the next pair of days. As a result, seas of 8 ft or greater will dominate most of the waters N of 02N and W of 115W by Sun morning, and N of 02N W of 110W by Mon morning. Seas of 8-9 ft are also expected S of the equator in SW swell. $$ GR