000 AXPZ20 KNHC 132141 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2141 UTC Sat Apr 13 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: The next gap wind event across the Tehuantepec region is expected Sun night and Mon as a ridge builds south along the eastern slopes of the Sierra Madre mountains in Mexico behind a cold front crossing the western Gulf of Mexico. Winds are forecast to abruptly increase to between 35 and 40 kt. Corresponding seas will build as high as 13 or 14 ft by early Mon. Winds and seas will diminish starting late Mon as the high pressure north of the region shifts eastward. Please read the latest High Seas Forecast issued by the National Hurricane Center under AWIPS/WMO headers FZPN03 KNHC/HSFEP2 or at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for further details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from the coast of Colombia near 06N77W to 09N110W. The ITCZ continues from 09N110W to 05N140W. Scattered moderate isolated strong convection is noted from 04N to 07N between 80W and 90W. Scattered moderate convection from 06N to 09N between 105W and 110W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends across the offshore waters W of Baja California from a 1032 mb high centered near 34N147W to the Revillagigedo Islands. Winds and seas continue to diminish across the area as the pressure gradient relaxes between the aforementioned high pressure and a deep low pressure over interior Mexico. The most recent altimeter pass indicated seas of 8 to 12 ft N of Cabo San Lazaro. The forecast calls for mainly gentle to moderate NW to N winds during the next several days. Seas will briefly subside to 8 ft or less through tonight, but a new set of long period NW swell will propagate across the region on Sun, keeping seas of 8 ft or greater N of Punta Eugenia through early Mon. Please refer to the Special Features section for additional details concerning the late season gale-force gap wind event expected to occur over the Gulf of Tehuantepec Sun night and Mon. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gulf of Papagayo: Moderate to fresh NE to E winds will prevail across the Gulf through Mon. Then, winds will increase to a fresh to strong breeze Mon night through Wed as high pressure builds N of the area. Sea heights to near 8 ft are expected with the strongest winds. Gulf of Panama: Mainly light to gentle wind will prevail across the area the next several days. Seas will generally remain in the 3 to 5 ft range through Tue, building to 4 to 6 ft Tue night through Wed night due to long period SW swell. Elsewhere, light to gentle winds will persist the next several days. Wave heights between Ecuador and the Galapagos Islands will generally remain in the 5 to 7 ft range in long period SW swell. REMAINDER OF THE AREA... As previously mentioned, a ridge extends across the northern forecast waters from a 1032 mb high located near 34N147W. This system has weakened some since yesterday. As a result, winds have diminished to 20 kt or less across the waters N of 10N W OF 120W. Seas in this region are in the 8 to 10 in residual NW swell. Winds and seas will continue to diminish until Mon as the high weakens and retreats W. A new set of long period NW swell will reach the NW corner of the discussion area on Tue. This swell event will spread eastward reaching the waters W of Baja California Norte Wed night through Thu night with seas of 8 to 9 ft. Cross equatorial SW swell will bring seas to 8 ft S of 02S between 105W and 120W through Sun. $$ Christensen