Tropical Weather Discussion

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Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Tue Sep 15 2026 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 1800 UTC surface analysis and satellite imagery through 2030 UTC. ...SPECIAL FEATURES... Tropical Depression Fifteen-E is centered near 15.7N 125.0W at 15/2100 UTC, moving west-southwest at 10 kt. Estimated minimum central pressure is 1006 mb. Maximum sustained wind speed is 25 kt with gusts to 35 kt. Peak seas are near 12 ft. Scattered moderate and isolated strong convection is noted from 12N to 18N between 119W and 125W. The system will continue to weaken while on a general westward to west-southwestward motion then dissipate by Thu morning. Please read the latest High Seas Forecast issued by the National Hurricane Center at website - https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml and the latest Fifteen-E NHC Forecast/Advisory and Public Advisory at www.hurricanes.gov for more details. Gulf of Tehuantepec Gale Warning: The pressure gradient between high pressure building over southern Mexico and the eastern north Pacific monsoon trough will support strong to near-gale force N to NE gap winds across the Gulf of Tehuantepec into Wed, and will reach minimal gale force Wed night. Rough seas will accompany these gap winds. ...TROPICAL WAVES... The axis of a tropical wave is near 106W from 02N to 17N, moving west at 10 to 15 kt. Nearby convection is discussed in the ITCZ/monsoon trough section below. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N85W to 09N116W. It resumes from 13N128W to 13N139W. Scattered moderate convection is noted from 00N to 12N east of 132W, and from 10N to 16N between 135W and 140W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see SPECIAL FEATURES section above for more on a gale warning in the Gulf of Tehuantepec. Fresh to strong N to NE gap winds, and seas of 6-8 ft, are over the Gulf of Tehuantepec. Moderate to fresh winds are over the northern Gulf of California. Gentle to moderate winds and 4-7 ft are noted elsewhere, except 1-3 ft in the central and southern Gulf. For the forecast, please see the Special Features section for information about the gale warning in the Gulf of Tehuantepec. Elsewhere, fresh SE to S winds pulse across the northern Gulf of California through Wed. Large N swell off Baja California Norte near Guadalupe Island will subside through mid week. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh to strong easterly winds, and moderate seas, prevail across the Gulf of Papagayo region, extending downstream to near 90W. Moderate to fresh winds extend downstream from the Gulf of Papagayo to the outer offshore waters of El Salvador and Guatemala. Elsewhere, moderate or weaker winds and moderate seas are noted. For the forecast, the pressure gradient between a ridge north of the area and the eastern north Pacific monsoon trough will support pulsing fresh to occasionally strong easterly winds and moderate to rough seas across the Papagayo region through mid week, then pulsing to moderate to fresh thereafter. Moderate winds and seas will prevail elsewhere. ...REMAINDER OF THE AREA... Please see the Special Features section for more information about Tropical Depression Fifteen-E. SW swell from the southern hemisphere is crossing the equator and reaching as far north as 03N between 100W and 120W. Gentle to moderate winds and 4-6 ft combined seas in mixed swell are noted elsewhere. For the forecast, Tropical Depression Fifteen-E will move to 15.2N 126.3W Wed morning, become a remnant low and move to 15.0N 128.2W Wed afternoon, and dissipate Thu morning. The southerly swell south of 03N will subside below 8 ft by this evening.