000 AXPZ20 KNHC 100840 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Sun Jan 10 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 0600 UTC surface analysis and satellite imagery through 0840 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: A cold front will enter the NW Gulf of Mexico tonight. This cold front will push across the Gulf of Mexico, reaching the Bay of Campeche Mon afternoon. Northerly winds behind the front will funnel into the Gulf of Tehuantepec, increasing winds to gale force Mon afternoon. The gale force winds area forecast to continue through early Fri. 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. 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 08.5N78W to 09N84W to 06N92W. The ITCZ continues from 06N92W to 08N115W to 06N128W to 06N140W. Scattered moderate convection is noted from 08N to 10N between 115W and 120W. Scattered moderate isolated strong convection is noted from 05N to 10N between 125W and 140W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Strong to near gale force winds, and seas to 10 ft, prevail over the Gulf of Tehuantepec. Winds and seas across the Tehuantepec region will decrease today. Another gale force gap wind event is expected in the Gulf of Tehuantepec starting Mon afternoon. Please see Special Features above for more information. Elsewhere, moderate to locally fresh NW to N winds are expected across the offshore waters of Baja California and north of Cabo San Lazaro over the next several days as a ridge remains in place just NW of the area. Large NW swell, with seas in the 10-12 ft range dominate the waters west of the Baja peninsula. Additional pulses of large NW swell will continue to propagate across this region through the upcoming week. Gulf of California: Winds are forecast to increase from north to south across the basin today as high pressure builds over the Great Basin region of the United States. Winds in the northern and central Gulf are expected to become fresh to strong this morning, then diminish to moderate to fresh through early next week. 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 upcoming week. Elsewhere, light to gentle winds will prevail north of the monsoon trough. Gentle to moderate S to SW winds are expected south of the monsoon trough through Mon, except for moderate to briefly fresh northerly winds across the Gulf of Panama. Large seas generated by gale-force winds in the Tehuantepec region will impact the offshore waters of Guatemala and El Salvador starting early this week. REMAINDER OF THE AREA... High pressure of 1026 mb is centered near 31N129W. The pressure gradient between this area of high pressure and lower pressure in the vicinity of the ITCZ is supporting moderate to fresh trade winds north of the ITCZ to 25N and west of 120W. Seas in this area are in the 8-12 ft range in a mix of NW swell and E-NE wind waves. These general marine conditions will persist during the next few days, while the NW swell gradually propagates southeastward, and is replaced by a new pulse of NW swell Mon and Tue. Long period NW swell continues to propagate across most of the forecast waters, with sea heights of 8-12 ft covering much of the waters west of 100W. Another pulse of NW swell has entered into the NW waters. This swell is bringing seas 12 ft or greater NW of a line from 30N131W to 23N140W, with seas peaking near 21 ft. Yet another pulse of NW swell will enter the NW waters Tuesday. $$ AL