000 AXPZ20 KNHC 290907 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 628 UTC Sun Oct 29 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 0600 UTC surface analysis and satellite imagery through 0830 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Minimal gale force N to NE winds will continue until around midday today as strong high pressure ridging southward along the Sierra Madre Oriental mountains of Mexico maintains the pressure gradient over the Isthmus of Tehuantepec. These winds will gradually diminish this afternoon through Monday afternoon as the high pressure system weakens and slides eastward across the northern Gulf of Mexico. Heavy Surf Conditions: Large swells of 8 to 11 ft, with periods of 20 to 24 Seconds, are beginning to reach the Pacific coast of Baja California Norte. The swells will continue to propagate SE along the remainder of the Baja coast through tonight, then reach the Pacific coast of Mexico near Cabo Corrientes by Mon night. Some of the swell energy could refract into the southern Gulf of California late tonight and Monday. Expect for the swell energy to bring breaking waves that could induce hazardous near shore conditions through late Monday. INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08N74W to 10N86W to 12N110W to 10N131W, where it transitions to the ITCZ and continues to 07N136W to beyond 08N140W. Scattered moderate and isolated strong convection is present from 08N to 11N between 94W and 108W and from 12N to 16N between 98W and 102W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Heavy Surf Conditions: please refer to the special features section above for information on heavy seas affecting the Pacific coast of Mexico through Monday night. Gulf of Tehuantepec: please refer to the special features section above for information on the continuing gale event. Gulf of California: Light and variable winds through Sunday will increase to moderate to locally fresh and generally from the south over the gulf N of 25N Monday through Tuesday as a trough of low pressure develops over the Baja Peninsula. A surface ridge currently extending southeastward from a 1020 mb high center located at 28N133W to near the Revillagigedo Islands will maintain a gentle to moderate NW breeze along the Pacific coast of Baja California through Tuesday night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Post Tropical Cyclone Selma has dissipated inland over NW Honduras, allowing winds and seas to subside in the vicinity of El Salvador. Even though Selma has dissipated, heavy rainfall will only gradually taper off along the pacific coast of Central America during the next couple of days. Otherwise, mainly gentle to moderate winds and seas of 4 to 6 ft will prevail for these waters through Mon night. Winds N of 10N could become light and variable on Tue as the monsoon trough becomes reestablished in this area. REMAINDER OF THE AREA... A 1020 mb high center analyzed at 28N133W ridges southeastward to near the Revillagigedo Islands. This ridge is maintaining light to moderate NE winds over the waters N of 15N and W of 120W. The high center will gradually shift northward and weaken through Monday night. This pattern will continue to support mainly gentle to moderate winds over these waters through mid week. Moderate to occasionally fresh SW winds are expected to the south of the monsoon trough through Tue night. Long-period NW swell is already producing seas in the range of 8 to 12 ft over the NW waters. The swell will continue spreading to cover the waters NW of a line from 21N115W to 01N140W by this afternoon, then across most of the waters W of 115W by tonight. Conditions will gradually improve over the northern waters Monday into Tuesday as the large swell decay and propagate into the southern waters. The swell over the southern waters will continue to decay and allow seas in this area to diminish below 8 ft by midweek. $$ CAM