000 AXPZ20 KNHC 201502 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1605 UTC Fri Nov 20 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 1500 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: The pressure gradient between a high pressure ridge over the Gulf of Mexico 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 11N101W. Peak seas to 14 ft prevail downwind of the Gulf. This long-lived gale event is expected to last through Mon morning. The leading edge of seas 8 ft or greater currently extend SW from the Gulf to near 105W 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. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N74W to 08N81W to 09N118W. The ITCZ continues from 09N118W to beyond 09N140W. Scattered moderate isolated strong convection is noted from 08N to 12N between 101W and 118W. 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. Elsehwere, a ridge extends southward across the Baja California offshore waters, extending from a 1031 mb high near 41N130W. The pressure gradient between this area of high pressure and a surface trough along the Gulf of California is supporting moderate northerly winds across the waters from Punta Eugenia northward, and gentle to moderate northwesterly winds to the south. Wave heights are 5-7 ft in long-period northwest swell, except to 8 ft across the far northern waters. Little change in winds and seas are expected through tonight. Moderate northerly winds prevail across 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 over the offshore waters and gradually shift westward through the weekend. This will produce generally moderate winds across the Baja offshore waters north of 20N, tonight through Sun. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Moderate southwest winds are south of 07N east of 100W, with gentle west to northwest winds north of the trough. Wave heights are generally 5-7 ft. Large seas generated across the Tehuantepec region will propagate into the offshore waters of Guatemala and El Salvador tday before gradually subsiding through the weekend. REMAINDER OF THE AREA... The remnant low of Post-Tropical Cyclone Polo is centered near 17N123W. Winds remain in the 20 to 25 kt range in association to this low. Seas of 8 to 11 ft are found to the N and NW of the low. The remnants of Polo are expected to continue to move towards the west today before dissipating tonight. A 1014 mb low pressure center currently just NW of the area has an attendant cold front that extends across the NW waters from 30N136W to beyond 26N140W. The low will weaken today, and the front will dissipate to a trough later tonight. This low pressure system and front has generated northwest swell across the northwest part of the area, with seas peaking near 11 ft. Strong high pressure will build south- southeastward across the area through the weekend. This will strengthen NE tradewinds west of 120W. Seas across this tradewind zone are expected to remain generally 7-10 ft in northwest swell through the weekend. $$ AL