000 AXPZ20 KNHC 211441 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1605 UTC Sat Nov 21 2020 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 1200 UTC surface analysis and satellite imagery through 1440 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: The pressure gradient between a high pressure ridge over the eastern slopes of the Sierra Madre Oriental and the eastern Pacific monsoon trough continues to support gale force northerly winds across the Tehuantepec region. Fresh to strong N to NE winds extend well offshore from Tehuantepec to near 12N98W. Peak seas to 14 ft prevail downwind of the Gulf. This long-lived gale event is expected to last through Mon and could possibly extend into early Tue morning. The leading edge of seas 8 ft or greater propagating out of Tehuantepec currently extend SW from the Gulf to near 110W and are forecast to continue to propagate westward the next couple of days. Please read the latest NWS High Seas Forecast issued by the National Hurricane Center at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...TROPICAL WAVES... The axis of a tropical wave is near 87W N of 03N, moving west at 10 to 15 kt. Scattered moderate to strong convection is mainly E of the wave axis from 06N to 12N E of 89W and extends across portions of Central America and into the SW Caribbean Sea. The axis of a tropical wave is near 106W, from 03N to 18N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is noted near the wave axis from 07N to 10N. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 09N83W to 08N94W to 10N105W to 08N115W. The ITCZ continues from 08N115W to 08N125W to beyond 10N140W. Scattered moderate to strong convection is noted from 06N to 12N E of 89W. Scattered moderate isolated strong convection is noted from 07N to 10N between 97W and 115W. 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. Elsewhwere, a ridge extends southward across the Baja California offshore waters, extending from a 1030 mb high near 42N128W. The pressure gradient between this area of high pressure and a surface trough along the Gulf of California is supporting gentle to moderate northerly winds across the waters off the coast of Baja California. Gentle to moderate winds prevail elsewhere. Wave heights are 6-7 ft in long-period northwest swell across the waters west of Baja California, with 4-6 ft seas prevailing elsewhere. Moderate to locally fresh northerly winds prevail across the central portions of the Gulf of California, where seas are 3-5 ft. These conditions will prevail today and then improve modestly through Sun. High pressure will build south-southeastward across the offshore waters and gradually shift westward through the weekend. This will produce generally moderate winds across the Baja offshore waters north of 21N through Sun. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Moderate southwest winds prevail south of 10N east of 90W, with gentle winds north of 10N. Wave heights are generally 5-7 ft. Large seas generated across the Tehuantepec region will continue to propagate into the offshore waters of Guatemala and El Salvador before gradually subsiding Mon. REMAINDER OF THE AREA... A trough extends along 128W, from 10N to 20N. Fresh to strong winds are noted within 120 nm W of the trough axis, with seas of 8-10 ft. The trough will continue to shift WSW through the weekend. A 1022 mb low pressure center currently just N of the area. Associated cold front has weakened to a trough, extending from 30N134W to 25N140W. This low pressure system has generated northwest swell across the northwest part of the area, where seas are near 9 ft. Strong high pressure will build south- southeastward across the area through the weekend. This will strengthen NE tradewinds generally from 09N to 23N to the west of 120W. Seas across this tradewind zone are expected to remain generally 7-10 ft in northwest swell through the weekend. $$ AL