000 AXPZ20 KNHC 112123 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Mon Jan 11 2021 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 Tehuantepec Gale Warning: Around 15Z, a scatterometer pass provided observations of minimal gale force winds across the Tehuantepec region, with fresh to strong winds affecting the waters N of 14N between 94W and 96W. Northerly winds, behind a cold front moving across the Gulf of Mexico, will continue to funnel through the Chivela pass into the Gulf of Tehuantepec. Gale conditions, with winds in the 35 to 40 kt range, are forecast to continue through Thu. Large seas generated from this gap wind event will spread well downwind and away from the Tehuantepec area, with seas greater than 12 ft reaching as far as 10N100W Tue night. Looking ahead, winds are forecast to diminish below gale force Thu through Fri, with another gale force gap wind event during the upcoming weekend. 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 10N85W to 07N95W. The ITCZ continues from 07N95W to 09N120W to 08N140W. Scattered moderate convection is seen from 04N to 07N between 78W and 83W, from 07N to 11N between 115W and 127W, and 120 nm south of the ITCZ axis between 134W and 140W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Gale force winds are currently blowing across the Tehuantepec region. Please see Special Features section for more details. Elsewhere, mainly gentle to moderate NW to N winds are expected across the offshore waters of Baja California over the next several days as a ridge remains in place. NW swell continues to propagate through the waters west of the Baja California peninsula. Seas of 10-14 ft prevail N of Cabo San Lazaro this afternoon while seas of 8 to 11 ft are noted elsewhere west of the Baja peninsula, extending further south to beyond the Revillagigedo Islands. Additional pulses of large NW swell will reach this region maintaining seas 8 ft or greater over this area for much of the week. Gulf of California: A recent scatterometer pass showed fresh to strong NW winds across the northern Gulf of California. High pressure centered over the Great Basin region of United States will support fresh to locally strong NW-N winds across the north and central parts of the Gulf through midweek. Peak seas are expected to build to around 6 ft. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Fresh offshore gap winds across the Gulf of Papagayo region will pulse to strong at night through the middle of the week. Seas will build to 9 or 10 ft. Outside of the gap winds areas, mainly light to gentle winds will prevail north of the monsoon trough while gentle to moderate S to SW winds are expected to the south. Large seas generated in the Tehuantepec region will impact the offshore waters of Guatemala and El Salvador tonight through Thu. Seas will peak 10-13 ft on Tue. REMAINDER OF THE AREA... High pressure of 1027 mb is centered near 32N127W. The pressure gradient between this area of high pressure and lower pressure in the vicinity of the ITCZ is supporting fresh to locally strong trade winds north of the ITCZ to 20N and W of 120W. Seas in this area are in the 8-12 ft range in a mix of NW swell and NE-E wind waves. These general marine conditions will persist during the next few days. Long period NW swell will continue to propagate across most of the forecast waters over the next several days. Another pulse of NW swell is currently spreading SE across the forecast region with seas of 12-14 ft N of a line from 30N116W to 25N115W to 18N130W to 30N125W.. Another pulse of NW swell will enter the NW waters Tuesday, with seas peaking 16 or 17 ft near 30N140W. Yet another pulse of NW swell will enter the NW waters Thu night, with seas of up to 18-19 ft near 30N140W. These successive sets of NW swell will maintain seas greater than 8 ft over much of the forecast waters west of 100W through the week. $$ GR