000 AXPZ20 KNHC 072200 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2050 UTC Fri Dec 7 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 2115 UTC. ...SPECIAL FEATURE... Gulf of Tehuantepec: Fresh to occasionally strong winds will diminish through this evening as weak high pressure shifts NE away from the western Gulf of Mexico, allowing seas to subside as well. The next gap wind event will have an abrupt beginning Sun afternoon as strong high pres builds southward behind a cold front blasting S along the Sierra Madre Oriental mountains of Mexico. Gale to strong gale conditions are expected Sun evening through Wed. The area of high seas generated by this event will spread WSW nearly a thousand miles from its source region by Tue night. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 09N75W to 09N87W to 06N101W. The ITCZ continues from 06N101W to 06N110W to 08N122W, then resumes from 08N125W to beyond 07N140W. Scattered moderate convection is present from 06N to 08N between 93W and 98W, from 07N to 11N between 128W and 131W and from 08N to 09N W of 136W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A 1024 mb high is centered near 32N127W will maintain moderate to fresh NW to N winds over the offshore waters W of Baja tonight, then light to moderate N to NE winds will prevail over the same waters winds Sat through Sun night. Long period 7 to 10 ft NW swell will sweep SE to near 110W by Sat, then gradually subside through Sun night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gulf of Papagayo...Nocturnal pulses of fresh to locally strong NE winds, and 6 to 8 ft seas, will linger through tonight, then subside this weekend. Elsewhere, the monsoon trough will meander between 08N and 10N with light to gentle winds on either side of the trough and 3 to 6 ft seas. REMAINDER OF THE AREA... Long period NW swell will continue propagating SE to encompass almost all of the forecast waters west of 110W by Sat afternoon. This area of swell will decay by Mon. Combined waves from trade winds and swell will support a large area of 8 to 10 ft seas south of 17N and west of 105W by Sun night. A cold front will weaken and stall near 30N140W tonight. A reinforcing cold front will reach 30N140W Sat evening, accompanied by fresh winds and additional large long period NW swell to 16 ft. This cold front will weaken as it moves eastward toward Baja California Norte through early next week. High pres building behind the front north of 20N will support fresh to strong trade winds farther south and 9 to 10 ft seas from 10N to 16N west of 130W Sat night through Mon. $$ CAM