872 AXPZ20 KNHC 221552 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1552 UTC Wed Aug 22 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... A tropical wave N of 04N along 94W extending to the Gulf of Tehuantepec area is moving W around 15 kt. Convection is limited with this tropical wave. A tropical wave from 03N to 19N along 110W is moving W around 15 kt. Scattered moderate and isolated strong convection is within an area bounded by 19N115W to 19N108W to 17N108W to 16N112W to 19N115W. A tropical wave from 05N to 1012 mb low pressure near 11N125W to 17N125W is moving W around 10 to 15 kt. Widely scattered moderate and isolated strong convection is within an area bounded by 17N125W to 14N118W to 06N125W to 08N132W to 15N130W to 17N125W. A tropical wave from 04N to 17N along 140W is moving W around 10 to 15 kt. Convection is limited with this tropical wave. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from low pressure over northern Colombia near 10N77W to 08N95W to 07N105W to 11.5N120W to low pressure near 11N125W to 09N137W. Scattered moderate to strong convection is within an area bounded by 09N82W to 09N79W to 06N77W to 03N83W to 05N88W to 09N82W, within an area bounded by 13N103W to 13N98W to 11N98W to 11N102W to 13N103W, and also within an area bounded by 11.5N117W to 12N113W to 06N112W to 06N116W to 11.5N117W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... In the Gulf of Tehuantepec, fresh to strong northerly winds will pulse through Thu night 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. 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 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 to locally strong through this morning, then to fresh thereafter at night. Seas are expected to remain 5 to 8 ft downstream of Papagayo during this time. REMAINDER OF THE AREA... Elsewhere, the pressure gradient between ridging across the northern waters and the ITCZ will support gentle to moderate trades and 4 to 7 ft seas in mixed swell north of the ITCZ 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. $$ Lewitsky