000 AXPZ20 KNHC 152102 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1827 UTC Mon Jan 15 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Gale force winds continue across the Gulf of Tehuantepec, where seas are as high as 17 ft. Winds will diminish slightly, though remain above gale force through Tue. A cold front will move into the Gulf of Mexico. Associated high pressure building behind the front will tighten the pressure gradient over the area, increasing winds to strong gale across Tehuantepec Tue night. Winds are expected to diminish below gale force by Friday. The resultant plume of NE swell have propagated westward, currently reaching as far W as 120W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough from 08N78W to 05N95W. The ITCZ extends from 05N95W to 08N122W to 08N140W. Scattered moderate isolated strong convection is noted from 04N to 08N between 79W and 84W. Scattered moderate isolated strong convection was noted from 06N to 10N between 120W and 130W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... See special feature section for information about the gale warning in the Gulf of Tehuantepec. W of the Baja California Peninsula: Large NW swell, with periods in the 18 to 22 second range will propagate into the forecast waters. Seas will peak near 13 ft W of Baja California Norte tonight through Tue before subsiding Wednesday. The large swell will generate very high and powerful surf along the coasts and outer reefs of Baja and mainland Mexico through Wed. Another set of NW swell will reach the offshore waters off Baja California Norte Thursday night. Seas associated to this swell will peak near 16 ft by Friday. Seas 12 ft or greater will spread across the offshore waters off the entire length of the Baja Peninsula through the weekend. Gulf of California: Light to moderate NW flow is forecast across across the entire gulf waters through Fri. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Nocturnal winds will pulse to strong across the Gulf of Papagayo the remainder of the week. Elsewhere N of 09N gentle to moderate winds will diminish to light to gentle midweek. S of 09N light to gentle winds will prevail. REMAINDER OF THE AREA... Large, long period NW swell is propagating across the forecast waters. Seas are reaching 19 ft over the far northwestern waters. The swell will continue to propagate SE across the discussion area while subsiding. By Tuesday, seas 8 ft or greater covering much of the forecast waters W of 107W, and then W of 100W by Wednesday. A fresh set of NW swell will enter the NW waters Wednesday night, with seas peaking near 20 ft. This swell will build seas greater than 12 ft over much of the waters N of 15N and W of 120W by Sat night. $$ AL