000 AXPZ20 KNHC 092159 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Sat Sep 9 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough is along 11N86W, to 11N100W, to a 1011 mb low pressure center that is near 15N112W, to 12N130W, and to 10N140W. Convective precipitation: scattered moderate to isolated strong...within 360 nm S of the monsoon trough between 87W AND 115W...and within 180 nm on either side of the monsoon trough between 121W and 134W. Scattered moderate to isolated strong from 03N to 10N to the E OF 87W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A NW to SE oriented trough will meander across the Baja California Peninsula and the Gulf of California, with a surface low developing intermittently along the trough, in the far northern Gulf waters. An E-to-W orientated ridge will meander from 23N116W to 17N106W through the middle of next week. A moderate NW breeze is forecast across the EPAC waters W of the Baja California Peninsula into early next week, with seas in the 5 to 6 ft range. Gulf of Tehuantepec: Strong to near gale-force northerly wind flow is expected through early Tue, with seas building to 11 ft downstream of the gulf waters from 14N to 16N between 94W and 96W. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Light W-NW flow is expected N of the monsoon trough, with fresh to locally strong southwesterly monsoonal flow expected S of the monsoon trough through Sun with 6 to 9 ft seas in cross- equatorial swell. The pressure gradient will relax during the middle of next week with the southerly swells also subsiding. REMAINDER OF THE AREA... A surface ridge extends from a 1027 mb high pressure center that is near 35N139W, just to the NW of the area, to the Revillagigedo Islands. Moderate anticyclonic wind flow is expected N of the monsoon trough and W of 115W through early next week. Fresh to strong southwesterly monsoonal flow will develop along 07N between 82W and 112W on Sun and Mon, with cross-equatorial southerly swell propagating N across the waters S of 11N between 82W and 113W. $$ mt