000 AXPZ20 KNHC 131535 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1605 UTC Thu May 13 2021 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 1530 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Building high pressure in the Gulf of Mexico will support gale force winds in the Tehuantepec region through Fri morning. There may be a brief lull just below gale force this afternoon, although mariners transiting the area should prepare for gale force winds through Fri morning. Seas will build to 8-11 ft with these winds. Gale force winds will diminish by Fri afternoon with fresh to strong northerly winds persisting into early Sat before diminishing. Please read the latest High Seas Forecast issued by the National Hurricane Center at website: https://www.nhc.noaa.gov/text/MIAHSFAT2.shtml ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from near 08N79W to 08N125W. The ITCZ continues from 08N125W to beyond 07N140W. Scattered moderate and isolated strong convection is noted from 06N to 13N between 96W and 117W. Scattered showers prevail along the remainder of the boundaries. In addition, scattered moderate convection is noted north of 12N between 90W and 96W, including across southwest Guatemala and southeast Mexico. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section for details on a Gulf of Tehuantepec Gale Warning. Along Baja California, northerly gentle to moderate winds are noted with light winds across the Gulf of California. Seas range 5-7 ft in NW swell with 3 ft or less in the Gulf of California. Elsewhere, light and variable winds prevail. Hazy/smokey conditions may be evident near the coast south of Cabo Corrientes to the Tehuantepec region. For the forecast, fresh southerly winds will pulse in the northern Gulf of California this weekend, except fresh to strong Fri night and Sat night as a pair of troughs move through the area, building seas temporarily to 4-6 ft. Gentle to moderate winds will prevail elsewhere. A moderate NW swell will subside in the waters west of Baja California through Thu, with another set arriving on Sat. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Fresh to strong winds are in the Papagayo region, while gentle to moderate winds prevail elsewhere. Seas are in the 3-5 ft range in mixed long period NW and SW swell, except 5-7 ft offshore of Ecuador and in the Papagayo region. For the forecast, moderate to fresh winds will prevail in the Papagayo region, pulsing to fresh to strong during the overnight hours through Sat night. Seas may occasionally build to 8 ft with the strongest winds. Gentle to moderate winds will prevail elsewhere. A set of southerly swell is expected to arrive by Fri, with a larger, reinforcing set this weekend. REMAINDER OF THE AREA... A broad surface ridge covers the waters north of the ITCZ. Gentle to moderate trades dominate the open waters of the tropical eastern Pacific, along with seas in the 5-8 ft range in long period, mixed northerly and southerly swell. The highest seas are found west of 120W and south of 11N, and along the equator between 105W and 120W. For the forecast, fairly tranquil marine conditions with moderate trades will prevail through the remainder of the week and weekend with trades locally to fresh at times. Southerly swell crossing the equator will maintain seas to 8 ft across the southern waters through Fri. A reinforcing set of southerly swell will east of 120W this weekend which will build seas to 7-9 ft south of 10N and east of 120W. Otherwise, seas will be mainly in the 5-7 ft range, locally to 8 ft in fresh trades. $$ ERA