000 AXPZ20 KNHC 180900 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0900 UTC Mon Nov 18 2019 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 0900 UTC. ...SPECIAL FEATURE... Tropical Depression Twenty-One is centered near 12.2N 105.0W at 18/0900 UTC moving NW at 6 kt. Estimated minimum central pressure is 1007 mb. Maximum sustained wind speed is 25 kt with gusts to 35 kt. Scattered moderate isolated strong convection is noted from 12N to 16N between 102W and 106W. The system will continue to move westward, and is forecast to become a remnant low later tonight. See latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP1/WTPZ21 KNHC for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 09N84W to 08N92W to 11N103W. It then resumes from 13N112W to 10N117W to 10N122W. The ITCZ extends from 10N122W to 11N133W to 10N140W. Scattered moderate isolated strong convection was noted from 07N to 09N between 83W and 88W. Scattered moderate isolated strong convection was noted from 06N to 09N between 91W and 97W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Gulf of Tehuantepec: The pressure gradient between high pressure over the western Gulf of Mexico and the monsoon trough in the eastern north Pacific is supporting near gale force gap winds in the Gulf of Tehuantepec, with resulting seas near 10 ft. Winds and seas will diminish Tue as the area of high pressure shifts eastward and the pressure gradient loosens. Fresh to strong winds, and seas in the 8-11 ft range are in portions of the Sinaloa and Baja California Sur offshore waters, associated with the remnant surface trough of Raymond. Scattered moderate to isolated strong convection is also affecting the region from 24N to 27N between 112W and 115W. Winds and seas will decrease over this region by late tonight. Winds and seas will increase off Baja California Norte and over the northern Gulf of California late Tue night as a cold front moves across the region. Seas will build to 8-11 ft by Thu over the waters north of Punta Eugenia. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh to locally strong winds will pulse across the Gulf of Papagayo each night through Wed night. Elsewhere, gentle to moderate southwest monsoonal flow will continue across the offshore waters of Costa Rica, Panama, Colombia, and Ecuador for the next several days. Wave heights will generally remain in the 4-7 ft range. REMAINDER OF THE AREA... Please see the Special Features section above for more information on T.D. Twenty-One-E. A surface ridge extends from high pressure centered near 35N135W to near 19N118W. The pressure gradient between this area of high pressure and lower pressure in the vicinity of the ITCZ is supporting moderate to fresh winds N of the ITCZ and W of 130W. Subsiding NW swell continues to impact the forecast waters, with seas 8 ft or greater covering much of the forecast waters N of 15N and W of 110W. Seas will continue to subside, and fall below 8 ft across much of the forecast waters by late tonight. Another set of large, long period NW swell is forecast to reach the NW forecast waters Thu night, with seas peaking near 13-14 ft Fri. $$ AL