000 AXPZ20 KNHC 210926 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 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 0600 UTC surface analysis and satellite imagery through 0850 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: The pressure gradient between a high pressure ridge over the southeast United States 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 13N97W. Peak seas to 12 ft prevail downwind of the Gulf. This long-lived gale event is expected to last through Mon morning 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 108W and are forecast to reach as far west as 110W by Sat morning. 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 86W N of 03N, moving west at 10 to 15 kt. Scattered moderate to strong convection is mainly E of the wave axis from 06.5N to 12N E of 88W and extends across portions of Central America and into the SW Caribbean Sea. The axis of a tropical wave is near 105W, from 03N to 18N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is noted W of the wave axis to 115W between 06.5N and 12N, and within 240 nm E of the wave axis from 08N to 13N. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 11N74W to 07N92W to 08N103W to 07N109W. The ITCZ continues from 07N109W to 07N127W to beyond 10N140W. Scattered moderate to strong convection is noted from 06.5N to 12N E of 88W. Scattered moderate isolated strong convection is noted from 07N to 12N between 101W 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 41N131W. 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 through Sat 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 09N east of 900W, 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... Overnight scatterometer data showed that the remnant low of Post-Tropical Cyclone Polo has weakened to a trough along about 127W from 14N to 19N. Winds still remain in the 20 to 25 kt range within 240 nm across N portions of the trough, while seas are 8 to 10 ft. This remnant trough will continue to shift WSW through the weekend. A 1016 mb low pressure center currently just N of the area near 34N137W has an attendant weakening cold front that extends across the NW waters from 30N134W to 26N140W. The low and front will continue to weaken overnight. This low pressure system and front have generated northwest swell across the northwest part of the area, where seas are peaking near 10 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. $$ Stripling