000 AXPZ20 KNHC 130334 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Mon Dec 13 2021 Tropical Weather Discussion for the eastern Pacific Ocean from 03.4S to 30N, east of 120W including the Gulf of California, and from the Equator to 30N, between 120W and 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 0230 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Strong surface high pressure across eastern Mexico, in the wake of a stalled frontal boundary across the western Gulf of Mexico this evening, is supporting a gale force gap wind event across the Tehuantepec region. Strong to gale force N-NE winds continue across Tehuantepec and extend downwind to near 14N96W, with 8 to 11 ft. Gale force winds are expected to continue through sunrise Mon morning, with seas building to 12 ft. Strong to near gale force N-NE winds will then continue to affect the Tehuantepec region and downstream waters Mon afternoon through Wed morning, then diminish to fresh to strong through Fri. Please refer to the latest High Seas Forecast product issued by the National Hurricane Center at the website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N75W to 09.5N83W to 07N96W. The ITCZ extends from 07N96W to 08N103W to 06.5N111W to 10.5N125W to beyond 07.5N140W. Scattered moderate convection is from 06N to 09N E of 90W and from 08N to 10N between 131W and 136W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO See the Special Features section above for details on the current gale force gap wind event in the Tehuantepec region. Light to gentle northerly winds continue this evening across the Baja California offshores, the Gulf of California through the entrance of the Gulf. Seas are 2-4 ft through the Gulf of California and 4-7 ft in NW swell across the offshore waters of Baja California. In Tehuantepec, strong to gale force winds are ongoing with 8-11 ft seas. Looking ahead, a strong cold front will move into the northern waters Tue. Fresh to strong SW winds are expected ahead of the front across the offshore waters N of 27N Tue afternoon before the front arrives Tue night. NW swell will move into the northern offshore waters early Tue and raise seas 8 to 12 ft by Tue afternoon, and peak at 10-15 ft across the waters of Baja Norte Wed morning. Meanwhile, similar strong SW to W gap winds will develop inside the N Gulf of California Tue and reach around 30 kt Tue evening, when seas will build to 8 ft. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR Fresh to strong NE to E are ongoing across the Papagayo region with seas to 6 ft. These gap winds are forecast to continue through Thu, and then diminish to moderate to fresh through Fri. Peak seas are forecast to be 5-6 ft. Gentle to moderate northerly winds and seas to 4 ft in the Gulf of Panama are forecast through Wed. Moderate S to SW winds are south of the monsoon trough with seas to 6 ft in SW swell. Light to gentle variable winds are elsewhere. These conditions are forecast to remain for the next several days. REMAINDER OF THE AREA... High pressure ridging dominates the forecast waters N of 15N between 108W and 132W, centered on a 1022 mb high near 29N126W. A pair of trough are to the south of the ridge, which pressure gradient is producing a zone of 15-20 kt winds from 15-20N between 120W and 134W. A strong cold front is entering the far NW waters and is forecast to continue to move E-SE through early next week, accompanied by very large NW swell. Seas are currently 8-12 ft behind the front. Elsewhere mainly gentle to moderate NE to E winds are N of 20N with seas to 6 ft in NW swell. Moderate to fresh SE winds are S of the ITCZ W of 118W with seas 6 to 7 ft. Large NW swell will continue to enter the NW waters tonight and move east of 120W Tue afternoon. Seas are expected to peak at 18-19 ft across the far NW waters Tue morning, with seas remaining 12 ft and greater N of 17N and W of 120W through late Wed. $$ Stripling