230 AXPZ20 KNHC 232035 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2035 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...TROPICAL WAVES... A tropical wave is just W of the Pacific coast of Colombia N of 23N along 78W moving W at around 20 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave extends N of 03N along 89W northward to El Salvador moving W at 20 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave from 04N to 20N along 120W is moving W around 15 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave from 05N131W to low pressure near 12N132W to 18N131W moving W at 10 to 15 kt. Associated convection is fairly limited. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08.5N78W to 08.5N100W to 11.5N120W to low pressure near 12N132W. The intertropical convergence zone axis extends from 12N132W to 07.5N140W. Scattered moderate and isolated strong convection is N of 04N E of 82W, within 180 nm S of the axis between 88W and 102W, from 09.5N to 14N between 93W and 100W, from 08N to 15N between 112W and 117W, from 07N to 12N between 119W and 124W, and also from 06N to 10N between 134W and 138W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... In the Gulf of Tehuantepec, fresh to near gale force northerly winds and seas of 8 to 9 ft will persist through early Fri due to a tight pressure gradient between high pressure N of the area and lowering pressure farther S in the tropics. These gap winds and related seas will return again Sat night and Sun night. 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. Winds will increase to fresh to strong offshore of Baja California Norte Mon night through Tue night with seas building to 6 to 8 ft. Meanwhile, 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 nocturnal offshore winds will pulse to fresh the next several nights, except fresh to strong Fri night into early Sat. 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. Seas are reaching 8 ft in a small area from 17N to 20N W of 138W, mainly due to a mix of northerly swell. This will persist through the remainder of the afternoon then will subside. Elsewhere, 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, although seas will remain less than 8 ft. $$ Lewitsky