840 AXPZ20 KNHC 230317 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 141 UTC Thu Aug 23 2018 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 0330 UTC. ...TROPICAL WAVES... A tropical wave extends N of 06N along 82W northward into the western Caribbean Sea moving W at around 15 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave from 04N to 18N along 113W is moving W around 15 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave from 04N128W to 1010 mb low pressure near 17N128W is moving W around 10 to 15 kt. Associated convection is described in the Monsoon Trough section below. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 09N83W to 08N100W to low pressure near 17N128W to 15N140W. Scattered moderate and isolated strong convection is evident from 05N to 09N between 85W and 90W, and within 120 nm either side of line from 110W and 130W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... In the Gulf of Tehuantepec, fresh to strong northerly winds will pulse tonight due to a tight pressure gradient between high pressure north of the area and lowering pressure farther south in the tropics. Seas may build briefly to between 8 and 10 ft during these pulses. This pattern will reoccur Thu night to a lesser extent. Elsewhere, ridging across the waters north of 20N will support moderate to occasionally fresh winds funneling along the coast of Baja California through the next several days, with 3 to 5 ft seas, with the highest seas off Baja California Norte. Gentle to moderate southerly flow will persist over the Gulf of California. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough will linger between 08N to 12N during the next few days. Winds on both sides of the trough axis will generally be light to moderate. The main exception to this will be over the Gulf of Papagayo, where moderate to fresh offshore winds will pulse at night. Seas are expected to remain less than 8 ft downstream of Papagayo with the winds. REMAINDER OF THE AREA... Elsewhere, the pressure gradient between ridging across the northern waters and the monsoon trough will support gentle to moderate trades and 4 to 7 ft seas in mixed swell north of the monsoon trough and west of 120W through the weekend. Sea heights will be relatively low for most of the forecast area this week. Robust long period swell could arrive from the Southern Hemisphere toward the end of this week and cause seas near the Equator to begin building over the weekend. $$ Christensen