000 AXPZ20 KNHC 190908 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Tue Mar 19 2019 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: A ridge across east and southeast Mexico will support strong offshore gap winds across the Gulf of Tehuantepec through Thu night, pulsing to minimal gale force in early morning hours. Strong to near gale force winds will continue to spill across the Tehuantepec region for the next few days to maintain the strong winds on the Pacific side of the isthmus. Seas will build to around 12 ft during peak winds, and spread large seas 8 ft or more downstream to near 12N97W each night. Please see the latest High Seas Forecast issued by the National Hurricane Center under AWIPS/WMO headers FZPN03 KNHC/HSFEP2 or at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for further details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A trough extends from 09N85W to 05N93W. The ITCZ continues from 05N93W to 01.5N105W TO 01N140W. Scattered moderate showers are within 30 nm of the ITCZ axis between 95W and 100W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section above for more details about the developing Gale Warning in the Gulf of Tehuantepec. Gulf of California: Light to gentle winds prevail across the Gulf as a weak pressure gradient dominates the region. A weak cold front will approach the northern Gulf late tonight into Wed. This will enhance moderate to fresh S to SW gap winds north of 29N that will continue into Wed night. Otherwise, light to moderate winds will prevail across the region through Fri night. Elsewhere, high pressure centered west of Baja California is supporting moderate N to NW winds over the northern waters that will persist through tonight. NW swell associated with a dying cold front will spread across the area tonight through Wed night with seas building to 11 ft off Baja California Norte. NW swell will reach the Revillagigedo Islands Thu, then gradually decay through late week. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gulf of Papagayo: The pressure gradient across Central America has begun to weaken but continues to support occasional strong offshore gap winds across the Gulf of Papagayo, with downstream seas to 8 ft. Fresh to strong NE to E winds will continue across the Gulf through Fri night, maximizing each night. Gulf of Panama: Fresh northerly winds across the Gulf of Panama today will diminish to moderate to fresh tonight Tue through midweek. Between Ecuador and the Galapagos Islands, 5-7 ft seas in SW swell will persist through early Wed. Elsewhere, generally light to moderate winds and 3-5 ft seas will prevail for the next several days. REMAINDER OF THE AREA... A cold front extends from 30N128W TO 19N138W this morning. Fresh to strong southerly winds will continue along and within 60 nm east of the front this morning north of 25N as the front moves eastward. Large NW swell behind the front is producing seas to 18 ft across the far NW waters, and will propagate across the region with 8 ft seas reaching to near 120W by Tue night. Elsewhere, weak high pressure centered near 26N119W anchors a broad ridge axis that extends southeast toward the Revillagigedo Islands. The gradient between the ridge and the ITCZ supports moderate to fresh trade winds mainly S of 18N and west of 116W to the ITCZ. Seas across this region are 7-8 ft with NW and SW swell combining with NE wind waves. High pressure will build across the far northwest waters Wed and move eastward through Fri night behind a cold front. The stronger pressure gradient will increase trade winds S of 20N to the ITCZ with seas to 11 ft on Wed in mixed NW and NE swell. Another cold front will approach from the northwest toward the end of the week with more large long period NW swell. $$ Mundell