000 AXPZ20 KNHC 251529 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1529 UTC Wed Oct 25 2017 Tropical Weather Discussion for the eastern Pacific Ocean from the Equator to 32N, east of 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 1445 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: A reinforcing cold airmass north of the area will produce winds to 45 kt today over the Gulf of Tehuantepec, with seas building to near 23 ft. The winds will gradually decrease tonight. However, winds will remain above gale force into Thursday. After a brief break, winds may once again increase to gale force this weekend. INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 12N85W to 07N110W to 07N138W where it transitions to the ITCZ that continues beyond 07N140W. Numerous moderate and isolated strong convection are 05N to 13N E of 90W. Scattered moderate and isolated strong convection are from 07N to 14N between 90W and 105W, and from 05N to 12N between 114W and 136W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Gulf of Tehuantepec: Please see the special features section above for information on this gale event. Gulf of California: Strong NW winds with seas to 5 ft currently across the gulf waters N of 30N will diminish to 20 kt or less late this morning. A surface ridge prevails west of the Baja California peninsula. Light to gentle N winds will accompany the ridge through early Saturday. Seas in the 6 to 9 ft range prevail over the waters off the Baja California peninsula in long period NW swell. Seas will diminish below 8 ft today, with slight to moderate seas prevailing through late week. By Saturday night, a fresh batch of 8 to 10 ft NW swell will reach the waters west of Baja California Norte. This swell will then spread as far south as 20N over the offshore zones by Sunday night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gentle to moderate W winds across the waters N of 09N will become northerly today and Thu. Fresh to strong southerly winds are expected S of 09N through tonight. The combination of these winds and swell propagating from the Tehuantepec Gale will support seas of 6 to 10 ft over the waters N of 07N into the upcoming weekend. Low pres is expected to develop off the Pacific coast of Costa Rica on Thu and move northwestward through the upcoming weekend. This low may cause an increase in winds and seas over these offshore waters before the low moves inland over Guatemala Sunday. REMAINDER OF THE AREA... A broad ridge dominates the waters N of 15N W of 115W, with gentle to moderate anticyclonic flow and combined seas of 7 to 9 ft in mixing cross-equatorial southerly swell and long period NW swell. These seas will gradually subside to less than 8 ft by Thursday. A fresh set of NW swell will move into the northwest waters Friday, with seas rapidly building and peaking near 14 ft near 30N140W Friday night. Swell greater than 8 ft will cover the majority of the discussion waters west of 110W by late Sunday. The swell will begin to subside early next week. $$ Latto