000 AXPZ20 KNHC 230334 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Mon Nov 23 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 0000 UTC surface analysis and satellite imagery through 0250 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 minimal gale force northerly winds across the Tehuantepec region tonight. Fresh to strong N to NE winds extend well offshore from Tehuantepec to near 11N99W. 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 09N99W. 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 92W N of 05N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is from 07.5N to 11.5N between 84W and 89W. The axis of a tropical wave is near 114W, from 03N to 19N, moving west at 15 kt. A 1007 mb low pressure center has formed associated with this wave near 12.5N111W, producing fresh to strong SE winds and seas 8 to 9 ft across the SE quadrant. Scattered moderate to strong convection is noted from 09N to 14N between 110W and 116W and from 08.5N to 12N between 116W and 122W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N75W to 10N80W to 06N102W to low pres near 12.5N111W 1007 mb to 09N123W. The ITCZ continues from 09N123W to low pres near 09N131W 1007 mb to beyond 07N140W. Scattered moderate convection is noted from 07.5N to 11.5N between 84W and 89W. Scattered moderate to strong convection is noted from 09N to 14N between 110W and 116W and from 08.5N to 12N between 116W and 122W. Scattered moderate convection noted from 07N to 09N between 126W and 139W. 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 22N. Wave heights are 5-6 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 have diminished this evening to 10 t or less and will persist 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 09N east of 90W, with gentle winds north of 10N. The exception to this is moderate NE will spilling out of the Papagayo region. 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 tonight 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 137W, from 14N to 20N. 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 tonight and move west of the area Mon. 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. Large 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. $$ Stripling