776 AXPZ20 KNHC 081457 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1605 UTC Mon Dec 8 2025 Tropical Weather Discussion for the eastern Pacific Ocean from 03.4S to 30N, east of 120W including the Gulf of California, and from the Equator to 30N, between 120W and 140W. The following information is based on satellite imagery, weather observations, radar, and meteorological analysis. Based on 1200 UTC surface analysis and satellite imagery through 1430 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: High pressure will build over the eastern slopes of Mexico in the wake of a cold front moving across the Gulf of America. The pressure gradient between this area of high pressure and lower pressure within the eastern north Pacific monsoon trough will usher in the next gale force gap wind event in the Gulf of Tehuantepec. Currently, fresh to strong winds are over the Gulf of Tehuantepec. High pressure will further build over eastern Mexico through the day, further tightening the pressure gradient and increasing winds to gale- force this evening. Gale-force winds will then likely persist through Tue evening. Very rough seas, peaking around 12 or 13 ft, are expected with this event tonight into early Tue morning when winds may briefly reach 40 kt. Of note: The monthly distribution of Tehuantepec events shows that the largest number of gale force events occurs in December. Storm-force events occur most often in January. Please read the latest High Seas issued by the National Hurricane Center at website: https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 11N86W to 07N97W to 12N108W to 12N118W. The ITCZ continues from 12N118W to 08N130W to beyond 08N140W. Scattered moderate and isolated strong convection is noted from 10N to 16N between 109W and 120W, and from 05N to 10N between 120W and 140W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale Warning is in effect for the Gulf of Tehunatepec. Please see the Special Features section for more information. Aside from conditions in the Gulf of Tehuantepec, a ridge extends from a 1028 mb high centered near 36N131W across the offshore forecast waters. The pressure gradient between this ridge and a trough over western Mexico is supporting fresh to locally strong winds over the Gulf of California, and gentle to moderate winds over the waters west of the Baja California peninsula, extending southward to the Revillagigedo Islands and eastward to the waters off Cabo Corrientes. Light to gentle winds and moderate seas in long period NW swell are observed across the remainder of the Mexican offshore waters. For the forecast, fresh to strong gap winds over the Gulf of Tehuantepec will reach gale-force tonight through Tue night. Occasionally fresh to locally strong NW to N winds and moderate seas are expected in the central Gulf of California through Tue morning. Fresh N winds may develop near Cabo Corrientes Tue night through Wed night. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Light to gentle winds prevail N of 05N, with gentle to moderate southerly winds S of 05N. Seas are mainly moderate in mixed SW and NW swell, with exception of slight seas nearshore. For the forecast, mainly gentle winds will prevail N of the monsoon trough the next several days, except pulsing to moderate to fresh in the Gulf of Papagayo beginning early Tue. Gentle to moderate winds will prevail S of monsoon trough. Moderate N winds will pulse in the Gulf of Panama starting Tue night. Seas generated by a gap wind event in the Gulf of Tehuantepec are expected to spread across the outer offshore waters of El Salvador and Guatemala Tue and Tue night. Otherwise, moderate seas in mixed SW and NW swell are expected over the regional waters through the week. ...REMAINDER OF THE AREA... High pressure dominates the waters N of 20N, anchored by a 1028 mb high centered near 36N131W. The pressure gradient between this area of high pressure and lower pressure in the vicinity of the ITCZ is supporting moderate to fresh winds N of the ITCZ to near 20N. Seas are in the 7-9 ft range over these waters. Moderate winds, and seas of 4 to 7 ft, prevail elsewhere over the discussion waters. For the forecast, little change to the synoptic pattern and marine conditions are expected through the middle of the week. A new set of long period NW swell is forecast to reach the NW part of the forecast region by the middle of the week, building seas to 8 to 9 ft over these waters before subsiding by the end of the week. $$ AL