301 AXPZ20 KNHC 250900 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 544 UTC Sat Aug 25 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 0600 UTC surface analysis and satellite imagery through 0900 UTC. ...TROPICAL WAVES... A tropical wave axis is near 86W N of 03N, moving W at 15 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave axis is near 101W N of 02N, moving W at 15-20 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave axis is near 130W from 03N to 20N, moving W around 15 kt. Associated convection is described in the Monsoon Trough section below. A tropical wave axis is near 139W from 06N to 18N, moving W at 10 to 15 kt. Associated convection is described in the Monsoon Trough section below. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08.5N78W to 09N89W to low pressure near 12N121W to 14N130W to 09N140W. Scattered moderate isolated strong convection is from 03N to 08N E of 80W, from 06N to 14N between 86W and 92W, from 07N to 13N between 94W and 101W, from 06N to 11N between 103W and 114W, and within 180 nm N and 210 nm S of the monsoon trough between 114W and 140W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... High pressure of 1035 mb centered near 44N147W extends a ridge SE to near the Revillagigedo Islands. The associated pressure gradient between the high and a trough across the Baja California Peninsula will support moderate to occasionally fresh NW winds funneling along the coast of Baja through the next several days, with seas generally 4 to 5 ft. The highest seas are expected off of Baja California Norte and may briefly increase to 6 ft. Low pressure will deepen over the SW United States, with a trough extending across the Gulf of California early next week. This will help to freshen winds offshore of Baja California Norte Mon night. Seas over this area will build to 6 to 8 ft. Meanwhile, gentle to moderate southerly flow will persist over the Gulf of California this weekend before diminishing early next week. In the Gulf of Tehuantepec this weekend, nocturnal winds will be enhanced with the passage of a tropical wave, with winds pulsing to the fresh to strong category tonight and Sun night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough will linger along 09N/10N 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. Nocturnal gap winds in the gulf tonight are enhanced by a tropical wave propagating across Central America, with fresh to strong winds prevailing. Winds will diminish this morning. However, nocturnal offshore winds will continue to pulse to fresh the next several nights. REMAINDER OF THE AREA... 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. Active convection is expected to continue across this region for the next few days as ample low level moisture will accompany the tropical waves moving westward across the region. Wave heights will be relatively low for most of the forecast area this week. Long period swell is expected to arrive from the Southern Hemisphere this weekend. Associated seas near the Equator will build, and peak at 6-8 ft, late Sun through Mon. $$ AL