000 AXPZ20 KNHC 040306 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 306 UTC Tue Dec 4 2018 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 FEATURE... Gulf of Tehuantepec Gale Warning: A cold front over the western Gulf of Mexico will continue moving across the Gulf. The pressure gradient between the post- frontal high pressure building across the Gulf of Mexico and the equatorial trough in the eastern north Pacific will help for northerly winds to surge into the Gulf of Tehuantepec. Winds will strengthen on Tue morning, then reach minimal gale force Tue afternoon. The gale conditions will then persist through late Wed night. Seas will peak near 13 ft downstream the Gulf of Tehuantepec on Wed. Winds will diminish to 20 kt or less late Fri night. .INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08N78W to 09N110W. The ITCZ extends from 09N110W to beyond 09N140W. Scattered moderate convection was noted from 08N to 10N between 94W and 97W. Scattered moderate isolated strong convection from 07N to 09N between 123W and 130W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see special features paragraph above for more on the upcoming Gulf of Tehuantepec gale force gap wind event. A cold front will move into Baja California Norte and the northern Gulf of California Thu, following a pre-frontal trough moving through the region late Wed into early Thu. Fresh to locally strong westerly winds will follow the trough. The front will gradually dissipate as it sweeps across the southern Gulf of California and Baja California Sur through early Fri. Looking ahead, high pressure will build behind the front into Sat allowing winds to diminish. For marine interests, another round of long period NW swell will accompany the front. The leading edge of seas 8 ft or greater will reach Guadalupe Island and the northern coast of Baja California Norte by late Thu, and will cover the entire Baja California coast and the Revillagigedo Islands by late Fri. Seas of 8 to 11 ft will persist in the open waters south of Punta Eugenia and west of 110W through late Sat. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gulf of Papagayo...Pulses of fresh NE winds are expected through Wed. Winds will strengthen Wed night through Fri with seas building to 8 ft. Elsewhere, the monsoon trough will meander between 08N and 10N this week with light to gentle variable flow, and 3 to 5 ft seas, forecast N of the monsoon trough, and moderate southwesterly monsoonal flow, and 4 to 6 ft seas, forecast S of the monsoon trough. REMAINDER OF THE AREA... A recent altimeter pass indicated linger seas to 8 ft near Clipperton Island. This is a remnant of a large area of primarily NW swell in excess of 8 ft which covered the region over the past several days. This area is expected to subside below 8 ft through tonight. A cold front extends from 30N130W to 23N140W. Fresh to strong winds are noted within 120 NM east of the front. The fresh to strong SW flow will accompany the front through Tue as the front shifts eastward across the forecast waters N of 20N. The front will also usher in a set of NW swell into the area, with seas building to a peak of near 13 ft north of 28N and west of 135W Tue night. Another set of NW swell will propagate into the NW part of the discussion area Wed night, building seas to near 14 ft N of 28N and W of 135W by Thu morning. The swells will continue to spread SE through the end of the week, with seas greater than 8 ft covering much of the forecast waters W of 110W by Sat. $$ Christensen