National Hurricane Center's Tropical Weather Discussion

Eastern Pacific Ocean

155 AXPZ20 KNHC 250920 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Wed Apr 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. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends west from the coast of Colombia near 07N77W to 06N98W, where the ITCZ continues westward to 07N117W to 06N140W. Scattered moderate isolated strong convection is within 75 nm south of the axis between 93W and 99W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge west of Baja California will strengthen by this weekend. Moderate to fresh northwest flow in offshore waters will become fresh to locally strong Fri through Sat night. Fresh to strong northerly winds are possible in the Gulf of Tehuantepec this weekend. Light to gentle W to NW winds are expected in the Gulf of California through Saturday. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh northeast nocturnal winds are expected in and downstream of the Gulf of Papagayo through tonight. Gentle nocturnal flow is forecast this week downstream of the Gulf of Panama. Gentle to moderate offshore flow will prevail elsewhere N of 09N, while light to gentle SW winds are expected S of 09N. REMAINDER OF THE AREA... A weakening cold front from 30N134W to 26N140W will move slowly east then dissipate later today. 7-9 ft NW swell associated with the front will gradually subside through tonight. A ridge will build behind the front Thu and Fri. Fresh northeast trade winds and 7-8 ft seas are observed across the tropical waters between 08N and 17N, south of the subtropical ridge and north of the the ITCZ. Little change is expected through the remainder of the week. 7-8 ft southerly swell observed south of the equator between 90W and 120W will gradually subside through Thursday morning. $$ Mundell