Tropical Weather Discussion

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Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Thu Aug 13 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 0600 UTC surface analysis and satellite imagery through 0830 UTC. ...SPECIAL FEATURES... Newly named Tropical Storm Hernan is centered near 18.1N 131.9W at 13/0900 UTC, moving west at 2 kt. Estimated minimum central pressure is 1006 mb. Maximum sustained wind speed is 35 kt with gusts to 45 kt. Hernan is expected to diminish thereafter as drier air moves into the area, and may become a remnant low through Fri. Maximum seas are reaching 11 ft within 60 nm of the center in the northwest quadrant, and may peak to 12 ft Thu. Scattered moderate convection is active within 60 nm of the center of Hernan. 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 Eight-E NHC Forecast/Advisory and Public Advisory at www.hurricanes.gov for more details. ...TROPICAL WAVES... The axis of a tropical wave is near 92W north of 02N, moving west at 10 to 15 kt. Nearby convection is discussed in the ITCZ/monsoon trough section below. The axis of a tropical wave is near 123W/124W from 02N to 18N, moving westward 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 09N78W to 07N95W to 08N110W. The ITCZ extends from 08N110W to 09N120W. Scattered moderate to isolated strong convection is from 05N to 13N between 85W and 105W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Moderate to fresh winds prevail over the Gulf of Tehuantepec. Gentle to moderate winds are found elsewhere. Moderate seas are over the open waters off Mexico, with slight to moderate seas over the Gulf of California. For the forecast, fresh to strong gap winds are expected across the Gulf of Tehuantepec through early next week. The pressure gradient between high pressure west of the area and lower pressures over northern Mexico will support moderate to locally fresh southerly winds across the northern Gulf of California tonight into Thu, then again on Thu night. A moderate pressure gradient will promote mostly gentle to moderate winds across the remainder offshore waters of Mexico along with moderate seas. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh to strong E gap winds and moderate seas persist across and downstream the Gulf of Papagayo. Gentle to moderate winds and moderate seas in SW swell prevail elsewhere. For the forecast, moderate to fresh NE to E gap winds and occasionally rough seas will pulse across the Papagayo region. Gentle to moderate winds will prevail between the Galapagos Islands and Ecuador, with large southerly swell moving into the region starting Thu night. Light to gentle winds and moderate seas in SW swell are expected elsewhere. ...REMAINDER OF THE AREA... Please see Special Features section above for more on newly named Tropical Storm Hernan. Broad ridging dominates the waters north of 20N. Outside of the area impacted by Hernan, the pattern is supporting fresh to locally strong winds, and rough seas, from 15N to 22N between 130W and 140W. Rough seas in southerly swell cover the waters S of 05N between 105W and 130W. Gentle to moderate winds, and moderate seas prevail elsewhere. For the forecast, please see Special Features section above for more on Hernan. Elsewhere, the southerly swell will maintain rough seas over the discussion waters S of 05N between 95W and 130W through the end of the week.