000 AXPZ20 KNHC 240240 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Mon Apr 24 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 0000 UTC surface analysis and satellite imagery through 0200 UTC. ...Special Features... Gulf of Tehuantepec Gale Warning: Fresh northerly winds spilling across and downstream of the Gulf of Tehuantepec this afternoon have begun to increase to 25-30 kt early this evening, raising peak seas to near 9 ft. Global models indicate that winds will increase briefly to minimal gale force overnight before diminishing to 25-30 kt around sunrise. Seas are expected to build to 11 ft downstream of the gulf near 14.5N95W by early morning. The pressure gradient will then quickly relax during the day Monday with winds diminishing to less than 20 kt during the afternoon and seas subsiding to less than 8 ft early Monday night. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The ITCZ extends from 05N85W TO 07N104W TO 08N117W TO 05N132W TO beyond 04N140W. Scattered moderate isolated strong convection is noted within 120 nm of axis between 85W and 99W. Scattered moderate to strong convection in noted within 180 nm N of axis between 106W and 121W...and within 90 nm N and 180 nm S of axis between 120W and 137W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A weakening cold front moving SE into Baja California Norte and the adjacent waters has become ill defined this afternoon. High pressure center of 1026 mb centered near 32N142W extends a ridge SE to near 16N112W. Gentle to moderate northwesterly winds are observed offshore of central Mexico, and light and variable offshore of southern Mexico to just west of the Gulf of Tehuantepec, with seas of 5-8 ft in long period NW swell. A tightening pressure gradient E of the high is already supporting 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. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gentle mostly onshore flow prevails late this afternoon due to daytime heating. Expect a diurnal-nocturnal shift in winds to occur the next few days with light to gentle offshore winds developing along the coasts at night through morning, and onshore flow late morning through the afternoon. Combined seas of 3 to 5 ft in mixed SW and NW swell are expected during the next several days. REMAINDER OF THE AREA... A dry and benign cold front has lost identity late this afternoon moving across the far offshore waters of Baja California Norte. The associated NW swell will propagate southeastward 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