000 AXPZ20 KNHC 032147 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Thu Dec 3 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 2100 UTC. ...SPECIAL FEATURES... Gulf of California Gale Warning: Strong high pressure located over the Great Basin region of the U.S. supports minimal gale force winds over the northern Gulf of California N of 29N. A recent scatterometer pass confirmed the presence of these winds forecast to diminish below gale-force tonight. Strong gusty NE winds are also noted through the passes on the west side of the Baja California peninsula mainly from 26N-29N between 114W and 117W. These winds of 20-30 kt will persist through late Fri with sea heights in the 8-11 ft range with NW swell. Please read the latest NWS High Seas Forecast issued by the National Hurricane Center at website https://www.nhc.noaa.gov/text/MIAHSFEP2.html for more details. Gulf of Tehuantepec Gale Warning: Strong to gale-force northerly gap winds and building seas are expected across the Tehuantepec region most of the forecast period. These winds will be associated first with a cold front moving across the western Gulf of Mexico, and then with a developing surface trough near the Mexican coast late Sat. This trough will drift E to along 94W south of 26N early Sun. Gale force winds are expected tonight through Fri night, and then again Sun night through Tue night. Seas are forecast to build to 15-17 ft with this gap wind event by Tue. Please read the latest NWS High Seas Forecast issued by the National Hurricane Center at website https://www.nhc.noaa.gov/text/MIAHSFEP2.html for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 09N83W to 07N95W to 10N115W to 09N124W. The ITCZ continues from 09N124W to beyond 08N140W. Scattered moderate convection is noted from 06N to 10N between 83W and 97W, from 08N to 10N between 105W and 108W and from 11N to 13N between 120W and 123W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale warning is in effect for the northern Gulf of California and also in the Tehuantepec region. Please, see Special Features section for more details. As previously mentioned, fresh to strong winds are funneling through the Baja California passes into the offshore waters due to the presence of strong high pressure over the Great Basin region. NW swell will propagate across the waters N of Cabo San Lazaro tonight into Fri morning building seas to 8-12 ft. This swell event will reach the Revillagigedo Islands by late Fri with building seas to 8 ft. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Fresh to locally strong NE to E winds are expected in the Gulf of Papagayo over the next couple of days, particularly during the overnight and early morning hours. Elsewhwere, light to gentle winds are expected north of the monsoon trough, with moderate to fresh S to SW winds south of the trough axis, through the upcoming weekend. REMAINDER OF THE AREA... High pressure of 1026 mb located near 33N127W dominates the northern forecast waters. The pressure gradient between the high and lower pressures in the vicinity of the ITCZ is supporting moderate to fresh trade winds roughly from 10N to 20N west of 125W. Seas are 8 to 12 ft in NW swell across this area. A ridge will persist across the northern forecast waters over the next several days, keeping a large area of fresh trade winds. Large long period NW swell continues to propagate across most of the waters N of the equator and W of 120W, with seas of 12 to 14 ft W of a line from 30N129W to 16N140W. Seas associated with this swell event will diminish tonight and Fri as the area of swell propagates to the east-southeast and decays. Another NW swell event is forecast to reach the NW corner of the forecast area by Sat. $$ GR