000 AXPZ20 KNHC 302147 CCA TWDEP Tropical Weather Discussion...Corrected NWS National Hurricane Center Miami FL 1605 UTC Tue Mar 30 2021 Corrected Special Features section 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 1545 UTC. ...SPECIAL FEATURES...Corrected Gulf of Tehuantepec Gale Warning: Strong high pressure, in the wake of a Gulf of Mexico cold front, will build southward along the eastern slopes of the Sierra Madre Oriental Mountains beginning late Wed into Thu. The resultant tight gradient between it and lower pressure south of Mexico is expected to result in a surge of strong to near gale-force winds in the Gulf of Tehuantepec region starting late Wed night. These winds are forecast to reach gale-force speeds early Thu, with wave heights building to the range of 10-14 ft. Please read the latest HIGH SEAS FORECAST- https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from a 1008 mb low over northwestern Colombia southwestward to 07N78W to 06N80W and to 06N90W, where overnight scatterometer data indicates that it transitions to the ITCZ to 04N105W to east of a trough near 06N112W. It resumes west of the trough at 05N122W to 04N136W and to beyond the area at 04N140W. Scattered convection is within 60 nm north of the ITCZ between 125W-129W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section above for details on an upcoming gap gale-force wind event in the Gulf of Tehuantepec region. The earlier strong north to northeast gap winds in the Gulf of Tehuantepec region have diminished to strong speeds this morning as pressure north of the area weakens. Wave heights are still reaching as high as 8 ft downstream of the Gulf of Tehuantepec with a component of longer-period SW swell. These wave heights will subside below 8 ft later this morning. The swell is supporting 3 to 5 ft wave heights elsewhere off southern Mexico south of Cabo Corrientes, with light to gentle breezes. Farther north, gentle to moderate NW winds persist with wave heights of 3-5 ft seas in open waters with mixed SW and NW swell. For the forecast, the strong winds gap winds across the Gulf of Tehuantepec will become light and variable winds this afternoon as high pressure over the Gulf of Mexico shifts eastward. Looking ahead, strong gale-force winds are forecast for the Gulf of Tehuantepec region beginning early Thu as another cold front moves into the region. Farther north, winds remain diminished but seas will build off Baja California late today through mid-week due to new NW swell. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... NE to E winds across the Gulf of Papagayo have increased to strong speeds. Wave heights there are up to about 8 ft as well as downstream of the plume of these winds. They are combining with a component of longer-period SW swell. Fresh N gap winds are also possible through the Gulf of Panama. Elsewhere light to gentle winds continue over the Central American offshore waters with 3-5 ft wave heights. For the forecast, fresh to strong offshore gap winds will persist across Gulf of Papagayo region, through the end of the week. Wave heights will build from northern Costa Rica to Guatemala later in the week, due to seas generated from the Papagayo and Tehuantepec gap wind areas mixing with longer period SW swell. REMAINDER OF THE AREA... A nearly stationary upper-level low is identified on water vapor imagery to be near 24N127W. Moisture levels have been increasing in the divergent deep-layer southerly flow east of the upper low and this is supporting scattered moderate to isolated strong convection from 06N to 10N between 114W-1197W. This mid to upper- level pattern is also supporting a surface trough farther south into the deep tropics that is analyzed from near 10N115W to 03N122W. This is also supporting an area of moderate to fresh trade winds to the west of the trough, with clusters of showers and thunderstorms north of the ITCZ. An overnight scatterometer satellite pass indicated a large area of fresh to strong trade winds farther west, extending from 03N to 17N west of 128W. This area is south of a 1040 mb high pressure center analyzed well north of the area near 46N139W. Seas are 8 to 9 ft in these areas of trade winds, assisted by a component of SW swell. Farther east in the deep tropics, gentle to moderate winds are noted with wave heights of 4 to 6 ft due to a SW swell. The leading edge of a set of NW swell is marked by wave heights of 8 ft north of 29N and between 122W-130W. This set of NW will propagate through the north- central waters into Thu, reaching south to near 26N. Maximum wave heights with this swell is forecast to reach the 8-10 ft range by early Wed, then decay to less than 8 ft by early Thu. For the forecast, farther east, wave heights will build to at least 8 ft from 05N to 10N between 95W and 110W due to an E swell generated from gap wind flow and persistent longer- period SW swell. $$ Aguirre