000 AXPZ20 KNHC 290856 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 915 UTC Thu Mar 29 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. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Light to gentle winds and seas of 4 to 7 ft in long period SW swell will prevail through Fri. Then, high pressure building N of the region will induce a gap wind event beginning Fri evening, with minimal gale conditions possible Fri night through Sat night. Based on marine guidance, seas are forecast to build to 12 to 14 ft with this gap wind event by Sat morning. Conditions will improve through the day Sun through early next week. Please refer to the High Seas Forecast issued by the National Weather Service under AWIPS/WMO headers MIAHSFEP2/FZPN03 KNHC for more details. This information also is found at the following website: www.hurricanes.gov/marine. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 08N82W to 06N94W. The ITCZ axis continues from 06N94W to 04N100W to 05N120W to 05N140W. Scattered moderate and isolated strong convection is within an area bounded by 08N140W to 10N113W to 05N120W to 03N134W to 08N140W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please refer to the Special Features section above for more information on the developing Gulf of Tehuantepec Gale Warning. High pressure of 1033 mb located well N of area near 43N133W extends a ridge SE across the forecast waters to near the Revillagigedo Islands. Mainly moderate to fresh NW winds prevail across the central and southern Gulf of California, with light and variable winds over the remainder of the Gulf. Gentle to moderate winds will prevail across the offshore waters W of Baja California, with 4 to 7 ft seas subsiding to 3 to 6 ft on Fri. Similar marine conditions are expected during the upcoming weekend into early next week. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gulf of Papagayo: Fresh to locally strong northeast nocturnal winds are expected this week and into the weekend, with seas building to as high as 8 ft downstream of the Gulf. Winds will then be moderate to fresh for Sun and Mon. Gulf of Panama: N to NE fresh to locally strong winds near the Azuero Peninsula are diminishing. Moderate to fresh N winds will prevail through Fri, slightly weaker thereafter. Elsewhere, gentle to moderate offshore flow is expected generally N of 07N, while light to gentle SW winds are forecast S of 07N. REMAINDER OF THE AREA... High pressure of 1033 mb located well N of area near 43N133W extends a ridge SE across the forecast waters to near the Revillagigedo Islands. The pressure gradient between the ridge and lower pressures in the vicinity of the ITCZ supports moderate to fresh trades N of the convergence zone and W of 110W. Seas of 7 to 10 ft across the W central waters will decay to less than 8 ft by Fri night. Outside of the the gap wind regions, expect winds of 20 kt or less, and seas less than 8 ft during the upcoming weekend and into early next week. $$ Lewitsky