{"msg": "558\nAXPZ20 KNHC 131547\nTWDEP \nTropical Weather Discussion\nNWS National Hurricane Center Miami FL\n1605 UTC Fri Nov 13 2026\nTropical Weather Discussion for the eastern Pacific Ocean from\n03.4S to 30N, east of 120W including the Gulf of California, and\nfrom the Equator to 30N, between 120W and 140W. The following\ninformation is based on satellite imagery, weather observations,\nradar, and meteorological analysis.\nBased on 1200 UTC surface analysis and satellite imagery through\n1515 UTC.\n...SPECIAL FEATURES...\nSignificant NW Swell Event: A series of NW swell sets will\ncontinue to impact the waters N of 10N the next several days. \nCurrently, seas are 12 to 16 ft NW of a line from 30N121W to \n23N128W to 20N140W, with peak seas around near 29N130W, and \nwave periods of 13-14 seconds. A reinforcing and larger set of NW\nswell will arrive later today, with peak seas around 22 ft near \n30N135W by early this evening. By Sat afternoon, this set with \nseas of 12 ft or greater will reach across the waters W of about\n30N118W to 20N132W to 20N140W and peak seas of 22 ft near \n30N126W. Those seas will keep spreading southeastward as yet \nanother set with seas of 12 ft or greater arrives to near 30N140W\nby late Sat night, spreading across the majority of the waters \ninto early next week. Please read the latest NHC High Seas \nForecast at website: \nhttps://www.hurricanes.gov/text/HSFEP2.shtml for more details.\n...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...\nThe monsoon trough axis extends from near NW Colombia westward \nto across northern Costa Rica and to 10N86W to 05N96W to \n06N102W, where it briefly pauses. It resumes at 07N107W to \n08N116W and to 03N127W, where it transitions to the ITCZ to \n02N133W and to 07N140W. Scattered moderate to isolated strong \nconvection is from 00N to 13N between 113W-122W. Scattered \nmoderate convection is within 120 nm south of the ITCZ between\n133W-137W.\n...OFFSHORE WATERS WITHIN 250 NM OF MEXICO...\nFresh to strong northerly winds are in the Gulf of Tehuantepec \nsupported by the pressure gradient between a high pressure system\nover southern United States and Mexico, and lower pressure with \nthe monsoon trough south of the area. Seas over these waters are\n6 to 9 ft in W to NW swell. Meanwhile, a weak pressure gradient \nis present in the remainder of the Mexican offshore waters with \nmainly light to gentle winds and decaying NW swell producing seas\nof 5 to 7 ft over most of the area S of Punta Eugenia, except \nfor slight seas in the Gulf of California. North of Punta \nEugenia, seas rough seas to 8 ft are present as a new set of \nlong-period NW swell continues to propagate through the waters\nwest of Baja California Norte.\nFor the forecast, fresh to strong northerly winds and rough seas\naround 9 ft will continue through tonight across the Gulf of \nTehuantepec. The next Tehuantepec gap wind event is forecast to \nbegin by Mon evening and continue through much of the next week. \nWinds may reach gale-force starting Tue evening, if not sooner. \nMeanwhile, a weakening cold front will move across the offshore \nwaters of Baja California today, bringing fresh winds and a batch\nof rough seas approaching 12 ft. Fresh to locally strong winds\nin the northern Gulf of California will diminish by early Sat.\nA rather expansive set of NW swell arriving Sat is expected \nto build seas to around 19 ft over the outer offshore waters\nof Baja California Norte. Rough seas will reach all the way to \npast 100W by early next week, while additional and reinforcing NW\nswell sets continue to arrive. \n...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, \nAND WITHIN 750 NM OF ECUADOR...\nThe pressure gradient has diminished in the Gulf of Papagayo\nregion due to a cold front moving across the Gulf of America and\nnorthern Florida. This is resulting in light to gentle winds, \nand slight to moderate seas across the Central America offshores. \nOtherwise, moderate or weaker SSW winds and moderate seas of 5 to\n7 ft are present between the Galapagos Islands and the coast of \nEcuador. Slightly higher winds and seas are possible due to \nclusters of moderate to strong convection offshore Ecuador. \nFor the forecast, moderate to fresh NE to E winds are forecast \nto return to the Papagayo region by late Sat night, reach strong \nspeeds by Mon night, and continue through Thu. Moderate N winds \nmay pulse in the Gulf of Panama early next week. Otherwise, \nmoderate or weaker winds and moderate seas in merging SW and NW \nswell will prevail, except locally rough SSW of the Galapagos \nIslands through tonight. Looking ahead, a set of NW swell may \nbuild seas to 8 ft or greater SSW of the Galapagos Islands by the\nmiddle of next week.\n...REMAINDER OF THE AREA...\nPlease refer to the Special Features section above for details on\na series of significant NW swell sets which will impact much of\nthe open waters.\nA dissipating cold front extends from 30N117W south-southwestward\nto 23N122W and to 17N140W. The pressure gradient between high \npressure centered well WNW of the area, and the aforementioned \nfront sustains moderate to fresh NW-N winds behind the front. Old\nand decaying NW swell supports seas of 6 to 8 ft out ahead of \nthe front while 10 to 14 ft seas in long-period NW swell are \nbehind the front. Moderate to fresh NE to E winds and rough seas \nto 11 ft are from 12N to 20N and west of 136W. Merging SW and NW\nswells supports combined seas of 7 to 9 ft over the waters S of \n10 between 94W and 125W. Elsewhere, winds are moderate or weaker \nalong with moderate seas as detected in overnight Ascat \nscatterometer data and by recent altimeter satellite data passes.\nFor the forecast, fresh NW winds behind the aforementioned cold \nfront will diminish to moderate speeds by this evening as \nthe dissipating frontal boundary reaches from near 27N114W to \n21N125W and to 16N140W. Very large seas in NW swell will follow\nin behind the frontal boundary. Another cold front will sweep \nacross the area today into the weekend, bringing even larger \nreinforcing NW swell, possibly reaching 24 ft along 30N. This set\nof swell with seas of 8 ft or greater will cover the waters N of\n05N and W of 110W by late Sat night, then covering all of the \nwaters W of 105W. Yet another set of large swell will arrive Sun,\nwith seas of 8 ft or greater across the entire waters W of 105W \nby late Sun night, then across the waters W of 95W by Tue \nevening. Meanwhile, the mixed swell over the equatorial waters \nwill diminish by early Sat. Looking ahead, another cold front \nmay move into the NW waters by the end of the weekend and into \nearly next week bringing a large area of fresh to strong winds \nbehind it as high pressure builds in behind the front.\n", "title": "Eastern Pacific Tropical Weather Discussion", "id": "1227208876176179207", "issued": "2026-11-13T16:05:00Z", "wmo": "AXPZ20", "source": "NOAA/NWS National Hurricane Center, received via the National Weather Wire Service", "page": "https://hurricane.terrapin.com/text/1227208876176179207"}