000 AXPZ20 KNHC 042047 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1740 UTC Fri Sep 4 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...SPECIAL FEATURES... The remnant low of for tropical cyclone Nana is moving across the waters near the Gulf of Tehuantepec near 14N95.5W. Scattered moderate to strong convection is noted north of 10N between 92W and 100W. Although most of the associated shower and thunderstorm activity is displaced well to the west of the low, a few showers and thunderstorms have recently developed near the center. Conditions are expected to be only marginally conducive for further development during the next couple of days, but only a small increase in thunderstorm activity could result in the formation of a tropical depression. This system is expected to move generally west-northwestward, near or along the southern coast of Mexico during the next few days. Please refer to the latest eastern north Pacific Tropical Weather Outlook for more information. ...TROPICAL WAVES... A tropical wave axis is near 83W north of 01N, moving west at 10 to 15 kt. Scattered moderate isolated strong convection is noted from 06N to 10N between 83W and 87W. A tropical wave axis is near 116W from 01N to 17N, moving west at 15 kt. Scattered moderate convection is noted from 08N to 12N within 60 nm east of the wave axis. A tropical wave axis is near 138W from 01N to 18N, moving west at 15 kt. No significant convection is associated with this wave. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 12N86W to 14N95W to 10N140W. Scattered moderate isolated strong convection is noted N of 04N E of 80W, and N of 06N between 81W and 87W. Scattered moderate to strong convection is noted north of 10N between 92W and 100W. Scattered moderate convection is noted from 09N to 11N between 100W and 120W. Scattered moderate isolated strong convection is noted from 08N to 12N between 120W and 130W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see above for more on the remnants of tropical cyclone Nana. High pressure will build across the Sierra Madre Oriental this weekend. This will tighten the pressure gradient between this ridge and the eastern Pacific monsoon trough. The tighter gradient will support a strengthening of gap winds over the Gulf of Tehuantepec this weekend into early next week. Elsewhere, gentle to moderate NW winds prevail across the waters north of 20N with 5 to 6 ft seas west of the Baja California peninsula. Little change in marine conditions is expected during the next few days. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Moderate to fresh SW winds prevail S of the monsoon trough. Seas are 7 to 9 ft in long-period southerly swell. Moderate to fresh SW winds and Southerly cross-equatorial swell will persist south of the monsoon trough the next several days. REMAINDER OF THE AREA... Gentle to moderate winds prevail north of the monsoon trough. Moderate to fresh southerly flow persists south of the monsoon trough, with areas of 7 to 8 ft seas. Long-period southerly swell is spreading northward across the region E of 120W, with 8- 9 ft seas S of the equator. This swell will continue propagating northward during the next few days. $$ AL