000 AXPZ20 KNHC 232145 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Sun Apr 23 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The ITCZ extends from 05N85W TO 07N104W TO 08.5N117W TO 05N132W TO beyond 04N140W. Scattered moderate to strong convection is noted within 90 nm of axis between 85W and 100W. Scattered moderate to strong convection in noted within 240 nm N and axis between 113W and 121W...and within 90 nm N and 150 nm S of axis between 120W and 135W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A weakening cold front extends from along the Baja California Norte coast near 30N116W to 23N132W, and is bridged by a surface ridge that originates from a 1026 mb high near 32N132W to 19N120W. Gentle to moderate northwesterly winds are observed offshore of central Mexico, and light and variable offshore of southern Mexico, with seas of 5-8 ft in long period NW swell. A tightening pressure gradient E of the high is already supporting a moderate to fresh NW winds north of 27N. Expect fresh to strong NW winds and seas of 8-12 ft from 29N to 32N through Mon night. These conditions will spread southward on Tuesday and reach as far south as 26N by Tuesday night. Strong to near gale force northwesterly winds are expected N of 29N late Wed night through Fri night with combined seas of 11 to 16 ft. Gulf of California: Variable winds prevail around a weak surface low N of 30N, but have increase to moderate to fresh SE of the low and N of 29N. Fresh to strong nocturnal sw winds are expected each of the next few nights across the gulf waters from 29.5N to 31N, with seas building to 5-6 ft. Gulf of Tehuantepec: Fresh northerly flow spilling downstream from the gulf this afternoon will increase tonight to near gale force by early Monday morning, with seas building to 11 ft downstream of the gulf near 14.5N95W. The pressure gradient will quickly relax during the day Monday with winds less than 20 kt and seas less than 8 ft by Monday night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Light to gentle mostly onshore flow this morning has become mostly onshore this afternoon with daytime heating. Expect this diurnal change to occur the next few days with offshore winds developing along the coasts at night through morning. Combined seas of 3 to 5 ft in mixed SW and NW swell are expected during the next several days. REMAINDER OF THE AREA... The dry and benign cold front from 30N116W to 23N132W will lose identity tonight and it shifts SE. Expect the associated NW swell to propagate southeastward today and tonight, then subside from the NW Monday through Wednesday. Strong NW winds and seas to 12 ft are expected north of 29.5N east of 123W tonight through early Wed, with similar conditions north of 28N east of 126W Thursday. $$ Stripling