000 AXPZ20 KNHC 230808 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Thu Apr 23 2020 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. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from the Pacific coast of Colombia near 06N77W to 05N80W to 10N88W to 11N100W. Another surface trough extends from 12N105W to 08N114W to 06N123W to 08N129W. Scattered moderate and isolated strong convection is noted N of 05N between 77W and 83W, from 03N to 10N between 104W and 109W, from 07N to 14N between 109W and 115W, from 04N to 08N between 115W and 120W, and from 06N to 09N between 124W and 131W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A 1032 mb high pressure is centered near 33N134W with a ridge extending SE to near the Revillagigedo Islands. The gradient between this ridge and a modest low pressure trough over the Gulf of California is supporting moderate NW winds to the W of Baja California. Elsewhere winds are moderate breeze or weaker across the Mexican offshore zones. Seas are 6 to 8 ft W of Baja California due to the aforementioned winds as well as decaying NW long period swell. The NW winds W of Baja California will decrease to gentle by Fri as the ridge backs away and as weak surface troughing develops W of Baja California. NW swell at 6 to 8 ft will continue to impact the waters W of Baja California Norte through Sat. For the waters just S of Oaxaca, nearshore W winds of moderate to fresh will develop early today and continue into tonight due to the influence of low pressure over interior Mexico. A pulse of fresh to strong northerly winds is possible in the Tehuantepec region Sun night into Mon. Elsewhere, quiescent conditions should prevail through the next several days. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... A weak pressure pattern is resulting in winds along the Central American and equatorial waters to be gentle breeze or weaker currently. Seas are mainly 4 to 6 ft in a mix of long period southern hemisphere southerly swell and northwesterly swell, except slightly higher seas up to 7 ft S-SW of the Galapagos. The weak pressure pattern should continue to provide tranquil conditions through the weekend, except in the Papagayo region where fresh offshore nocturnal winds are likely Sat night, and fresh to strong Sun night and Mon night due to a locally tight pressure gradient. No significant long-period swell is expected through the next several days. REMAINDER OF THE AREA... A 1032 mb high pressure is centered near 33N134W with a ridge extending SE to the Revillagigedo Islands. The ridging along with several weak troughs and lower pressure along the convergence zone is supporting fresh trades from 09N to 25N and W of 120W along with seas of 8 to 10 ft. The high is anticipated to weaken some by Fri, leading to lighter NE trades on Fri through Mon. However, continued long- period NW swell should cause combined seas to be 8 to 10 ft generally N of 12N and W of 122W into the weekend. Weak low pressure may form in the vicinity of 12N112W today, then meander slowly N or W into the weekend. This low may serve as a focus for showers and thunderstorms, with some locally gusty winds associated with them. A combination of S swell and SE wind waves will likely produce combined seas up to 8 ft along the equatorial waters west of 100W on Fri and Sat. $$ Lewitsky