684 AXPZ20 KNHC 092142 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Sat Apr 9 2022 Tropical Weather Discussion for the eastern Pacific Ocean from 03.4S to 30N, east of 120W including the Gulf of California, and from the Equator to 30N, between 120W and 140W. The following information is based on satellite imagery, weather observations, radar, and meteorological analysis. Based on 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...SPECIAL FEATURES... The pressure gradient between high pressure over the western Gulf of Mexico and the equatorial trough is supporting a gale- force gap wind event in the Gulf of Tehuantepec, with seas 11 to 14 ft. The area of high pressure will shift eastward, causing winds over the Gulf of Tehuantepec to diminish below gale force this evening. Winds and seas will continue to decrease through Sun. Seas generated from this gale-force gap wind event will spread far from the Tehuantepec region, with seas greater than 8 ft reaching as far west as 105W through this evening. Please read the latest NWS High Seas Forecast issued by the National Hurricane Center at the website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 08N78W to 08N85W to 05N96W. The ITCZ continues from 05N96W to 08N112W. It resumes from 05N127W to 05N135W to 07N140W. A surface trough extends from 12N121W to 06N125W, with a 1011 mb low pressure along it near 08N123.5W. Another surface trough extends from 11.5N115W to 09N117W. Scattered moderate isolated strong convection is noted from 04N to 09N between 78W and 85W, from 07N to 09N between 124W and 126W, and from 03N to 09N between 130W and 140W. Scattered moderate convection extends from 04N to 14N between 91W and 121W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO Please refer to the Special Features for details on the ongoing gale-force gap wind event in the Gulf of Tehuantepec. Aside from the Gulf of Tehuantepec, gentle winds prevail west of Baja California Sur, with moderate to fresh NW winds well offshore Baja California Norte. Fresh SE to S winds are over the northern Gulf of California, with moderate winds elsewhere over the Gulf. Light to gentle winds prevail elsewhere. Seas are 6-10 ft well offshore Baja California Norte in northerly swell, that has recently entered the area. Seas are 5-6 ft elsewhere offshore Mexico, except for 2-4 ft in the northern Gulf of California and 1-3 ft elsewhere in the Gulf. For the forecast, the gale-force winds in the Gulf of Tehuantepec will diminish this evening. Fresh to strong winds will persist across the northern Gulf of California through Mon night. A set of northerly swell will continue to propagate into the waters off Baja California tonight into Sun, with rough seas persisting into Mon. A cold front will move into the northern portion of the area by Tue morning. Fresh to strong NW winds are likely behind the front to the west of Baja California Norte. Renewed swell will enter the area behind this front. This will keep significant wave heights in excess of 8 ft west of Baja California from tonight through much of next week. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR Fresh to strong winds prevail over the Gulf of Papagayo region, with moderate winds over the Gulf of Panama. Light to gentle winds prevail elsewhere. Seas are in the 4-6 ft range, except 7-8 ft in the Papagayo region. Seas are 7-10 ft in NW to N swell well offshore of Guatemala due to the ongoing gap wind event in the Gulf of Tehuantepec. For the forecast, fresh to strong winds in the Papagayo region will continue into next week, possibly reaching locally near gale force late tonight through early Sun. Mainly light to gentle winds are expected over the rest of the offshore waters, pulsing to fresh in the Gulf of Panama into early next week. NW to N swell associated with a gale-force gap wind event in the Tehuantepec region will continue to impact the waters well offshore Guatemala through this evening. S to SW swell from the Southern Hemisphere will increase seas Mon to the south of the Galapagos Islands and to the west of Ecuador. REMAINDER OF THE AREA Strong high pressure of 1041 mb is centered north of the area near 40N140W. This area of high pressure is generating a tight pressure gradient that is supporting fresh to strong NE winds over the northwest portion of the area, to the northwest of a line extending from 30N120W to 20N140W. Seas in this area are in the 10-14 ft range. Moderate to fresh trade winds are elsewhere north of the ITCZ and west of 130W, with gentle to moderate winds prevailing elsewhere. Seas are in the 6-8 ft range, except 8-9 ft west of 134W from 05N to 12N. Southern Hemisphere swell is affecting the area south of the Equator between 108W-120W, with 8-9 ft seas. For the forecast, the area of fresh to strong winds over the northwest part of the area will continue through the weekend before starting to diminish early next week. Swell generated from these winds will spread southward, with seas greater than 8 ft covering much of the waters north of 10N and west of 115W by Mon night. A weak cold front will enter the northern waters by Tue morning. The front will bring renewed northerly swell to the area east of 125W and north of 22N Tue through Wed. Southerly swell from the Southern Hemisphere will continue to affect areas south of 05N between the Galapagos Islands and 120W through the early part of next week. $$ Hagen