000 AXPZ20 KNHC 212041 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 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 1800 UTC surface analysis and satellite imagery through 2040 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 12N97W. 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. 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 88/89W N of 03N, moving west at 10 to 15 kt. Scattered moderate to strong convection is from 05N to 12N E of 90W and extends across portions of Central America and into the SW Caribbean Sea. The axis of a tropical wave is near 106/107W, from 03N to 18N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is noted near the wave axis from 08N to 11N. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N85W to 08N92W to 09N105W to 08N113W. The ITCZ continues from 08N113W to 08N122W to beyond 10N140W. Scattered moderate to strong convection is noted from 05N to 12N E of 90W. Scattered moderate isolated strong convection is noted from 08N to 11N between 99W 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 decrease 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 129W, from 10N to 20N. Fresh to locally strong winds are noted within 120 nm W of the trough axis, with seas of 8-10 ft. The trough will continue to shift W through the weekend. A 1022 mb low pressure center currently just N of the area near 33N136W. A trough extends from the low through 30N134W to 25N140W. Associated swell has subsided below 8 ft over the discussion area. A new set of NW swell will propagate into the far NW waters Sun night. 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