000 AXPZ20 KNHC 090846 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Sat Jan 9 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: The pressure gradient between high pressure over the Gulf of Mexico and the eastern north Pacific monsoon trough is supporting northerly gale force gap winds across the Gulf of Tehuantepec. The gale force winds will continue through late this morning. Seas downwind of the Gulf of Tehuantepec are in the 10-13 ft range. Winds and seas will diminish tonight and Sun as high pressure north of the area weakens and the pressure gradient loosens. Looking ahead, another gale-force event is expected to start Mon and continue through early Fri. 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 08.5N79W to 07N94W. The ITCZ continues from 07N94W to 08N112W to 06N140W. Scattered moderate convection is noted from 06N to 09N between 101W and 114W, and from 05N to 08N between 122W and 132W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... See Special Features for details on the Gale Warning in the Gulf of Tehuantepec, as well as Gale Conditions Possible next week. Elsewhere, moderate to 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 10-13 ft range west of Baja California Norte, and in the 8-11 ft range west of Baja California Sur dominates the waters west of the Baja peninsula. Additional pulses of large NW swell will continue to propagate across this region through next week. Gulf of California: Gentle to moderate NW to N winds are expected across the Gulf of California today. Winds are forecast to increase tonight into early Sun 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 early Sun, 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... Winds across the Gulf of Papagayo region will pulse to strong through the weekend. 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 reach the outer offshore waters of Guatemala and El Salvador today, and then again early next week. REMAINDER OF THE AREA... High pressure prevails over the northern waters. 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 26N and west of 120W. Seas in this area are in the 8-13 ft range in a mix of NW swell and E-NE wind waves. These marine conditions will persist during the next few days. 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. Seas are peaking near 13 ft N of 27N between 120W and 130W. Another pulse of NW swell will move into the NW waters today, with seas peaking near 20 ft there tonight. Yet another pulse of NW swell will enter the NW waters next Tuesday. $$ AL