000 AXPZ20 KNHC 090653 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Tue Jun 9 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 0600 UTC surface analysis and satellite imagery through 0900 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08N80W to 14N97W to 1012 mb low pressure near 10N115W to 08N122W. The Intertropical Convergence Zone continues from 08N122W to beyond 05N140W. Scattered moderate to isolated strong convection is observed from 05N to 09N between 87W and 93W, from 07N to 12N between 98W and 100W, and from 07N to 12N between 106W and 112W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge will dominate the offshore forecast waters of Baja California during the next several days producing gentle to moderate NW to N winds. The pressure gradient will tighten some Fri night through Sat night between a 1030 mb high pressure located NW of the area and lower pressures over the SW CONUS and NW Mexico. This will support fresh to locally strong NW winds mainly N of Punta Eugenia, with seas of 6-9 ft. Currently, seas, in the 8-11 ft range, generating by strong winds off the coast of Southern California continue to propagate as NW swell across the waters N of Cabo San Lazaro. This swell event will gradually subside to less than 8 ft late today. In the northern Gulf of California, moderate to fresh NW to N winds will prevail today, with seas of 3-5 ft. Elsewhere across the Gulf, mainly gentle to moderate winds are expected. Looking ahead, a gap wind event is forecast across the Tehuantepec region beginning late Thu as a ridge builds across the the eastern slopes of the Sierra Madre mountains in Mexico and the western Gulf of Mexico. Strong to near gale force northerly winds are expected to persist Thu night through Sun night, with seas likely building to 10-13 ft. There is a chance of winds reaching minimal gale force at night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gentle to moderate S to SW winds will prevail across the offshore waters. Winds off western Panama and Costa Rica will increase to 15 to 20 kt during the middle of the week, then diminish again through the latter part of the week. Cross equatorial SW swell will continue to propagate across the region, with seas building 8-9 ft between Ecuador and the Galapagos Islands tonight into Tue. Similar wave heights, associated with the same swell event, are forecast to reach the offshore waters of West Panama and Costa Rica by Tue night into Wed, including also the Azuero Peninsula and the entrance to the Gulf of Panama. REMAINDER OF THE AREA... A ridge extends from a high pressure of 1029 mb located near 34N132W toward Clarion Island. The pressure gradient between the ridge and lower pressures in the vicinity of the ITCZ continues to support an area of moderate to fresh trade winds from 10N to 20N west of 130W. Recent altimeter satellite data just to the west of this area shows seas of 8-9 ft, likely in mixed NE and SW swell. The ridge is expected to weaken into mid week ahead of an approaching cold front northwest of the discussion area. This will allow the trade winds to diminish slightly through Tue, but the development of a weak trough along the ITCZ west of 130W will keep the gradient tight enough to support fresh to locally strong trades winds between 10N and 20N west of 130W into late week, with seas 8 to 9 ft in a mix of swell and shorter period NE wind waves. Farther east, altimeter data also confirmed persistent seas to 8 or 9 ft south of 10N and east of 110W, mainly due to S to SW swell. A reinforcing group of southerly swell is approaching the equator, and will propagate across the waters south of 10N between 90W and 110W through mid week. $$ GR