000 AXPZ20 KNHC 040235 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0205 UTC Fri Nov 4 2016 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 0000 UTC surface analysis and satellite imagery through 0300 UTC. ...SPECIAL FEATURES... A gale warning remains in effect for the Gulf of Tehuantepec. A cold front moving across the western Gulf of Mexico on Friday will bring another gap wind event across the Gulf of Tehuantepec. Northerly winds are forecast to surge across the Tehuantepec area this evening reaching minimal gale force winds tonight. Seas are forecast to build to 12 ft with these strong to gale force winds on Friday. This gale event will likely persist through Sunday morning. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 12N87W to 10N97W to 11N105W. The ITCZ extends from 11N105W to 09N120W to 11N130W. Scattered moderate isolated strong convection is from 10N to 13N between 101W and 106W. Clusters of scattered moderate isolated strong convection are from 09N to 20N between 125W and 140W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends across the offshore forecast waters to beyond the Revillagigedo Islands. Moderate northerly winds between Los Cabos and Las Tres Marias Islands...including the southern portion of the Gulf of California are expected to increase to 20- 25 kt tonight and Friday night. High pressure is building southward over eastern Mexico. This will cause winds to increase over the Gulf of Tehuantepec. See the Special Features section for details. Another set of long period NW swell will reach the coast of Baja tonight into Friday...and the Revillagigedo Islands by Fri evening. Expect building seas across the offshore waters of Baja on Friday, with seas of 8-11 ft N of 20N W of 113W by Fri night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... NE winds over the Gulf of Papagayo could become strong on Saturday during the early morning hours. Otherwise, light to gentle winds will prevail over the waters north of 10N, with moderate to fresh winds south of 10N. Seas of 4-6 ft are generally expected N of 10N and 5-7 ft seas S of 10N through Monday. Seas generated in the Tehuantepec area are expected to affect the offshore waters of forecast zone PMZ027 late Friday through Sunday. An elongated area of disturbed weather extends a few hundred miles south of the coast of southern Mexico. Development of this system is not expected during the next couple of days, but environmental conditions could become somewhat more conducive for development late this weekend or early next week while the disturbance moves westward to west-northwestward away from the coast of Mexico. REMAINDER OF THE AREA... A ridge dominates the northern waters anchored by a 1023 mb high located near 31N129W. The pressure gradient between this ridge and a 1011 mb low pres located near 14N132W is supporting an area of fresh to strong trade winds from 15N to 18N between 126W and 135W. The low is forecast to open up into a trough in about 24 hours. The area of fresh to strong winds will move westward in tandem with the trough forecast to be bear 140W by Saturday morning. Large long period NW swell continues to propagate SE from the NW corner across the forecast waters building seas to 12-14 ft NW of a line from 30N127W to 20N140W. Seas of 8-12 ft are noted across much of the area N of 10N W of 125W. By Friday evening, seas of 08-12 ft will dominate the forecast waters W of a line from 30N116W to 19N110W to 13N113W to 00N140W with the highest seas of 12-15 ft N of 26N between 122W and 129W. The next cold front is forecast to reach 30N136W on Saturday evening and will quickly dissipate over the NW waters by Saturday night. A robust swell event appears to be in store on Monday and Tuesday. Model guidance suggests seas as high as 21 feet near 30N140W on Tuesday morning. $$ Formosa