000 AXPZ20 KNHC 222050 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Sun Nov 22 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 tonight. Fresh to strong N to NE winds extend well offshore from Tehuantepec to near 12N97W. Peak seas to 12 ft prevail downwind of the Gulf. Associated seas to 8 ft and greater extend downwind of the outer edge of the offshore waters near 09.5N99W. This long- lived gale event has already peaked in intensity, as the ridge is beginning to slowly weaken across the Gulf of Mexico. However, gale force winds are expected to last through early Tue, while winds diminish slightly each afternoon. Winds will diminish to 20 kt or less and seas will subside to less than 8 ft by Tue night. 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 90W N of 03N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is from 06N to 11N between 84W and 91W. The axis of a tropical wave is near 113W, from 03N to 19N, moving west at 15 kt. Scattered moderate isolated strong convection is noted near the wave axis from 08N to 12N between 107W and 118W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N85W to 08N96W to 11N109W to 08N130W. The ITCZ continues from 08N130W to beyond 07N140W. Scattered moderate isolated strong convection is noted from 06N to 11N between 84W and 91W. Scattered moderate isolated strong convection is noted from 08N to 12N between 105W and 135W. 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. A ridge extends across the Baja California offshore waters. The pressure gradient between this area of high pressure and a surface trough along the Gulf of California is supporting generally moderate northerly winds across the waters off the coast of Baja California. Gentle to moderate winds prevail elsewhere south of 21N. Wave heights are 5-7 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 and southern portions of the Gulf of California, where seas are 3-5 ft. These conditions will decrease gradually through Mon. Strong northerly winds will develop off the California coast tonight and Mon, with fresh winds spreading into the northern waters of Baja California Norte Mon. This will usher in an increasing northerly swell that will raise wave heights across the Baja waters to 6-9 ft. Large NW swell will move into the Baja offshore waters Wed night, with seas 8 ft or greater spreading southward across the Baja California waters through Fri night. Seas associated to this swell will peak near 14 off off Baja California Norte Thu night into Fri morning. 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 in mixed south to southwest swell. Large seas generated across the Tehuantepec region will continue to propagate into the offshore waters of Guatemala and El Salvador before gradually subsiding Mon. Moderate NE to E winds will pulse to fresh each night over the Papagayo region Mon through Thu night. REMAINDER OF THE AREA... A trough extends along 135W, from 12N to 19N. Fresh to locally strong winds are noted within 120 nm west of the trough axis, with seas of 8-10 ft. The trough will continue to shift W through the remainder of the weekend. Fresh NW swell has propagated into the far NW waters, with seas to 8 ft. Strong high pressure across the area will maintain fresh to locally strong tradewinds generally from 09N to 23N to the west of 125W through Mon, with winds dimishing slightly thereafter. Seas across this tradewind zone are expected to remain generally 7-9 ft in through much of the week. A large set of NW swell will move into the northern waters midweek. Seas will peak near 15 ft over the northern waters N of 20N and E of 130W Thu into early Fri. $$ AL