000 AXPZ20 KNHC 091518 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1231 UTC Sun Apr 9 2017 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. ...SPECIAL FEATURES... None. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 08N86W to 03N100W to low pres 1010 mb near 03N105W to 04N108W. The ITCZ reaches from 04N108W to 04N113W, the resumes from 03N114W to 02N126W to 01N131W. Scattered moderate and isolated strong convection is present from 03N to 09N between 81W and 87W and also from 03N to 06N between 97W and 103W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... High pressure continues building in across the region in the wake of a dissipated cold front. The pressure gradient is tight enough to generate fresh to strong NW winds over the offshore waters W of the Baja California Peninsula. These winds will diminish tonight as the pressure gradient slackens in response to low pressure passing NW of the area weakening the ridge, then will return by the middle of the week as the gradient tightens again. Seas in NW swell of 8-11 ft will gradually subside through Tuesday. A new set of NW swell generated behind the next cold front will arrive by Wednesday. The cold front will weaken as it approaches Baja California Norte on Thursday. In the Gulf of California, moderate to fresh NW flow N of 30N behind a cold front extending from 30.5N113W to 29.5N113.5W will spread SE across the Gulf this afternoon, Moderate NW winds are then expected Mon and Mon night. Light to gentle NW flow will prevail through Wed, then become light and variable thereafter. In the Gulf of Tehuantepec, winds will generally be light to moderate through Tuesday night. The next surge of fresh to strong northerly winds should begin early on Wed and continue through the end of the week. Near gale force winds will be possible Wed night until early Thu. Seas will build to between 8 and 12 ft during this next gap wind event. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... In the Gulf of Papagayo, fresh to locally strong nocturnal drainage winds will diminish slightly today, with mainly fresh nocturnal flow expected thereafter until Wed night through Thu night as winds ramp back up to between fresh and strong. In the Gulf of Panama, moderate to fresh nocturnal northerly flow will continue during the overnight hours through the end of the week. Elsewhere, light to gentle winds and combined seas of 3-5 ft prevail. REMAINDER OF THE AREA... High pressure continues to build in across the waters N of the ITCZ in the wake of a dissipated cold front. A ridge extends from a 1025 mb high centered near 32N129W to 16N110W. Moderate to fresh N to NE winds are occurring between the ridge and ITCZ. Light to gentle winds are observed N of 26N and W of 125W, closer to the center of the high. Seas of 6-9 ft in NW swell prevail across the area W of 110W. Another batch of NW swell will cause seas to build to between 8 and 11 ft N of 28N and W of 133W ahead of a cold front that will reach 30N140W early on Tuesday. The new set of NW swell will mainly affect the waters N of 24N as they decay. A reinforcing batch of NW swell will move in Wed night through Friday. $$ cam