000 AXPZ20 KNHC 041552 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1505 UTC Mon Sep 4 2017 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 1430 UTC. ...TROPICAL WAVES... A tropical wave axis is along 110W/111W from 11N to 21N, moving west at 10 to 15 kt. Scattered moderate convection is from 15N to 19N between 103W and 116W. ..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 09N75W to 1010 mb low pres near 09N90W to 15N108W to 1010 mb low pres near 14N127W to to 13N140W. Scattered moderate and isolated strong convection are from 03N to 11N, E of 83W, from 08N to 14N between 87W and 96W, and from 05N to 09N between 92W and 107W. Scattered moderate convection is from 08N to 15N between 125W and 135W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... The eastern periphery of a weak ridge over the NW portion of the discussion area will build eastward Tuesday night and persist through Thursday. The pressure gradient between this ridge and lower pressure over Mexico will support mainly gentle to moderate NW winds, and seas of 3 to 5 ft across these waters through Tuesday. The pressure gradient will tighten Tuesday night through Thursday as the ridge builds east, resulting in moderate to fresh winds west of Baja California Norte with seas of 5 to 7 ft. Farther south, fresh to strong overnight gap winds are possible through the Gulf of Tehuantepec late in the week, with seas building to near 7 to 8 ft. Otherwise, light to gentle winds and seas of 4 to 6 ft will prevail. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Light and variable winds are expected N of the monsoon trough through Tuesday, with moderate to locally fresh southerly winds expected S of the monsoon trough with 4 to 6 ft seas over the entire area through Thursday. By Friday the southerly winds are forecast to increase slightly to the south of the monsoon trough, building seas to 6 to 8 ft across that area Friday and into next weekend. REMAINDER OF THE AREA... A weak 1019 mb high is analyzed near 26N134W and has a ridge axis that extends to around 22N115W. The pressure gradient between the high and lower pressure associated with the monsoon trough will maintain mainly gentle trade winds N of 20N and W of 120W, with seas remaining 4 to 6 ft through Friday. South of 20N and north of the monsoon trough, expect moderate northeast trades with seas of 5 to 7 ft. Moderate to occasionally fresh SW winds are expected S of the monsoon trough through Friday. Long period cross- equatorial swell producing combined seas of 7 to 8 ft in SW waters today will slowly decay through tonight, but will remain about 5 to 7 ft through the upcoming week. $$ Latto