000 AXPZ20 KNHC 220330 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 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 0000 UTC surface analysis and satellite imagery through 0230 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: The pressure gradient between a high pressure ridge over the eastern slopes of the Sierra Madre Orientales 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 12.5N96W. Peak seas to 13 ft prevail downwind of the Gulf in the vicinity of 14.5N95W. Associated seas to 8 ft and greater extend well downwind of the outer edge of the offshore waters near 11N97.5W. This long-lived gale event has peaked in intensity, but is expected to last through Mon as winds diminish slightly each afternoon. Minimal gales 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 89W N of 03N, moving west at 10 to 15 kt. Afternoon scatterometer data showed a broad low pressure center near 08.5N84.5W, and recent satellite imagery suggests that this 1008 mb low has shifted west to 86W and is helping to force active convection across the waters of Costa Rica. Scattered moderate to strong convection is from 07N to 11.5N between 81W and 90W and extends across portions of Central America and into the SW Caribbean Sea. The axis of a tropical wave is near 108W, from 03N to 19N, moving west at 15 kt. Scattered moderate isolated strong convection is noted near the wave axis from 07.5N to 12N between 103W and 113W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N75W to low pres 1008 mb near 08.5N86W to 09N90W to 08N113W. The ITCZ continues from 08N113W to 09N124W to beyond 08N140W. Scattered moderate to strong convection is noted from 07N to 11.5N between 81W and 90W. Scattered moderate isolated strong convection is noted from 07.5N to 12N between 103W and 113W, and within 120 nm N of the ITCZ between 114W and 131W. 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 broadening ridge extends southward across the Baja California offshore waters, extending from a 1026 mb high near 38N131W. 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 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 and southern portions of the Gulf of California, where seas are 3-5 ft. These conditions will persist through Sun morning then decrease gradually Sun through Mon. 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, with seas of 5-6 ft. Strong northerly winds developing off the California coast Sun night and Mon will spread into the northern waters of Baja California Norte Mon accompanied by increasing northerly swell that will raise wave heights across the Baja waters to 6-9 ft. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Fresh SW winds prevail across the southeast portions of the low pressure at 08.5N86W, where seas are 7-8 ft. Elsewhere moderate southwest winds prevail south of 09N 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. REMAINDER OF THE AREA... A trough extends along 132W, from 10N to 20N. Fresh to locally strong winds are noted within 120 nm NW 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 32N136W. A trough extends from the low through 30N134W to 25N140W. Associated swell generated by this system has subsided to 7 ft over NW portions of the discussion area. Fresh 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 125W Sun and Mon. Seas across this tradewind zone are expected to remain generally 7-10 ft in northwest swell through the weekend. $$ Stripling