189 AXPZ20 KNHC 241557 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1605 UTC Fri Aug 24 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 1200 UTC surface analysis and satellite imagery through 1500 UTC. ...TROPICAL WAVES... The axis of a tropical wave is near 82W-83W N of 02N, moving W at 15-20 kt. Associated convection is described in the Monsoon Trough section below. The axis of a tropical wave is near 96W-97W N of 03N, moving W at 15 kt. Associated convection is widespread and described in the Monsoon Trough section below. The axis of a tropical wave is near 124W-125W from 03N to 20N, moving W around 15 kt. Associated convection is described in the Monsoon Trough section below. Two middle level vortices are seen in satellite imagery, near 10.5N124W and near 10N117W. The axis of a tropical wave is near 135W from 03N to 19N, 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 08N74W TO 10N85W TO 08N93W TO 12.5N112W TO 11N119W TO 12.5N126W TO 09N137W. Scattered moderate to strong convection is from 05N to 12.5N between 76W and 86W, from 06N to 16.5N between 90W and 106W. Widely scattered moderate to strong convection is from 12N to 20N between 112W and 133W, while scattered moderate to strong convection is within 120 nm N and 180 nm S of the through between 115W and 137W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A broad ridge extends SE across the waters north of 20N from a 1034 mb high across the NE Pacific. The associated pressure gradient across the Baja California offshore waters 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. 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. In the Gulf of Tehuantepec, fresh to strong northerly winds and seas to near 8 ft continue this morning across the Gulf to the north of 14.5N, but will begin to decrease later this morning to less than 20 kt. Winds and seas will once again increase across Tehuantepec Sat night and Sun night due to the influence of nocturnal drainage flow. 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... 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. Sea heights will be relatively low for most of the forecast area this week. Long period swell is expected to 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. $$ Stripling