636 AXPZ20 KNHC 182041 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2040 UTC Sat Apr 18 2020 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 1800 UTC surface analysis and satellite imagery through 2040 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 07N78W to low pressure near 06N95W to low pressure near 07N110W to 06N115W. The ITCZ continues from 06N115W to 05N130W to 05N140W. Scattered moderate isolated strong convection is noted from 02N to 06N E of 80W, from 03N to 10N between 90W and 112W, and from 02N to 08N W of 124W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends from high pressure of 1022 mb centered near 27N135W to the Revillagigedo Islands while a surface trough extends across the Gulf of California. The pressure gradient between these features is supporting moderate to fresh winds over the southern tip of Baja California Sur, with gentle to moderate winds prevailing elsewhere W of the Baja California peninsula. Light to gentle winds prevail elsewhere across the forecast waters. Seas are in the 5-7 ft range off Baja California Norte, and 4-5 ft elsewhere across the open forecast waters. Seas in the 1-2 ft range prevails over the Gulf of California. The high pressure ridge W of Baja California will weaken through Sun. Gentle to moderate NW winds are expected W of Baja California, with light to gentle winds prevailing elsewhere into early next week. NW winds W of Baja California Norte will strengthen by Tue night as high pressure builds in from the NW. Seas over this area will build to 7-9 ft in fresh NW swell through Thu. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Recent ASCAT data indicates moderate to fresh winds prevail over and downstream of the Gulf of Papagayo. Gentle to moderate winds prevail over the Gulf of Panama. Light to gentle winds prevail elsewhere. Seas are in the 6-7 ft range over and downstream of the Gulf of Papagayo region, and 3-5 ft elsewhere. The pressure gradient between high pressure N of the area and the equatorial trough will support moderate to fresh winds across the Papagayo region through Sun. Light to gentle winds will prevail elsewhere. Moderate SW swell will propagate into the waters between Colombia and Ecuador tonight. REMAINDER OF THE AREA... A ridge extends from high pressure of 1022 mb centered near 27N135W to the Revillagigedo Islands. The pressure gradient between this area of high pressure and lower pressure in the vicinity of the ITCZ is supporting gentle to moderate winds N of the ITCZ to 20N and W of 120W. Low pressure of 1011 mb is centered near 06N95W with gentle to moderate winds in the vicinity of the low. Light to gentle winds prevail elsewhere. Seas are in the 5-8 ft range N of 05N and W of 120W. SW swell has propagated into the southern waters, with seas in the 6-7 ft range S of 05N between 110W and 120W. Seas are in the 4-5 ft range elsewhere. The area of high pressure will weaken, which will diminish tradewinds through early next week. High pressure will then build N of the forecast area, strengthening tradewinds W of 130W. The low will shift W-NW the next few days, with mainly gentle to moderate winds within 120 nm of the center of the low. Light to gentle winds are expected elsewhere for the next several days. Little change in seas is expected through Sun. Long period NW swell will combine with NE wind waves building seas N of 10N and W of 130W to 8-9 ft Mon. These seas will expand eastward to 120W on Tue and Wed before starting to subside Thu. Northerly swell will propagate into the waters N of 25N and E of 125W, building seas to 8-9 ft Wed into Thu. $$ AL