026 AXPZ20 KNHC 051455 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1354 UTC Sat Sep 5 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 1200 UTC surface analysis and satellite imagery through 1450 UTC. ...SPECIAL FEATURES... The remnant low of tropical cyclone Nana is near 15.5N100.5W, or about 150 miles south of Acapulco, Mexico. This system is producing a large area of thunderstorms well to the west and northwest of its center and a smaller area of showers near its center. Although conditions do not appear to be favorable for much further development, and only a small increase in thunderstorm activity near the surface center of circulation would result in the formation of a tropical depression or tropical storm. This system is expected to move generally west- northwestward, near or along the southwestern coast of Mexico during the next few days. Regardless of development, this low could produce locally heavy rainfall along portions of the southwestern coast of Mexico. For more information, please consult products from your local meteorological office. ...TROPICAL WAVES... A tropical wave axis is near 87W north of 01N, moving west at 15 kt. Scattered moderate convection is noted from 08N to 12N between 84W and 87W. A tropical wave axis is near 121W from 01N to 19N, moving west at 10 to 15 kt. Scattered moderate convection is noted from 09N to 11N within 60 nm of the wave axis. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 11N86W to low pressure near 15.5N100.5W to 11N110W to 11N133W. The ITCZ continues from 11N133W to 10N140W. Scattered moderate convection is noted from 08N to 12N between 84W and 87W. Scattered moderate isolated strong convection is noted from 08N to 12N between 90W and 133W. Scattered moderate convection is noted from 08N to 10N between 133W and 140W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see Special Features above for information on remnants of tropical cyclone Nana. High pressure building across the Sierra Madre Oriental this weekend will tighten the pressure gradient between the ridge and the eastern Pacific monsoon trough. This will support a strengthening of northerly gap winds over the Gulf of Tehuantepec tonight through Monday. 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 to 9 ft seas south of the equator. This swell will continue propagating northward through Mon. $$ AL