000 AXPZ20 KNHC 110303 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Sun Sep 10 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 0000 UTC surface analysis and satellite imagery through 0200 UTC. ...TROPICAL WAVES AND TROPICAL LOWS... A tropical wave is along 108W from 20N southward, moving westward 15 knots. A 1007 mb low pressure center is near 16N108W. Convective precipitation: Scattered moderate to strong within 90 nm of the center in the NW quadrant. Widely scattered moderate to isolated strong elsewhere from 12N to 16N beween 106W and 113W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough passes through southern Mexico near 15N93W, to 14N100W, to 11N113W, to 13N123W, to a 1012 mb low pressure center that is near 13N133W, beyond 11N140W. Convective precipitation: scattered moderate to isolated strong within 120 nm north of the monsoon trough between 98W and 100W, within 240 nm to the south of the monsoon trough between 105W and 116W, and within 180 nm to 420 nm to the south of the monsoon trough between 90W and 102W. Isolated moderate to locally strong within 150 nm on either side of the monsoon trough between 120W and 131W. scattered moderate to isolated strong within 90 nm of the 1012 mb low pressure center in the SW quadrant. Isolated moderate to locally strong from 07N to 10N from 90W eastward. ...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 axis in the far northern Gulf waters. A W to E orientated ridge will meander from 23N116W to 19N109W through the middle of next week. Gulf of Tehuantepec: Strong to near gale force northerly flow is expected through early Tue, with seas building to 11 ft downstream of the gulf waters near 13N98W. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough is expected to lift N this week with moderate to locally fresh southwesterly monsoonal flow expected S of the trough axis with 6 to 9 ft seas in cross-equatorial swell. These southerly swells with subside to less than 8 ft on Wed night. REMAINDER OF THE AREA... High pressure of 1027 mb centered north of the area near 38N136W extends a ridge southeast to near 21N112W. Moderate anticyclonic flow is expected N of the monsoon trough and W of 115W through early next week. Fresh to locally strong SW monsoonal flow, and seas in the 7 to 11 ft range in long period cross-equatorial swell is forecast to propagate N across the tropical waters between 80W and 115W through Tue. $$ mt