000 AXPZ20 KNHC 040857 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Tue Apr 4 2023 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 0600 UTC surface analysis and satellite imagery through 0830 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 07N78W to 09N85W to 05N95W to 05N95W. The ITCZ continues from 05N95W to 06N110W to beyond 04N140W. Scattered moderate convection is observed from 04N to 07N between 110W and 123W. Scattered moderate convection is observed from 02N to 05N between 85W and 92W, from 04N to 06N between 112W and 122W, and from 04N to 06N between 135W and 140W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A dissipating cold front currently extends across the central Gulf of California through Punta Eugenia into the adjacent water of the eastern Pacific. A pair of scatterometer satellite pass from 0420 UTC and 0515 UTC confirmed fresh to strong winds accompanying the front reaching as far south as Cabo San Lazaro. Combined seas of 8 to 13 ft also accompany the front off Baja California, confirmed by an earlier altimeter satellite pass from a few hours ago. The scatterometer pass also confirmed strong SW winds over the northern Gulf of California, ahead of the front. Gentle breezes and moderate seas of 3 to 5 ft are evident elsewhere. Smoke from agricultural fires over southern Mexico may be limiting visibility slightly in the coastal waters from Chiapas to Jalisco. For the forecast, the cold front moving through Baja California Norte will dissipate early this morning. Strong to near- gale force NW winds will follow the front along with 8 to 12 ft combined seas in NW swell off the coast of Baja California north of Cabo San Lazaro through the afternoon. Winds and seas will diminish through mid week, but not before combined seas in excess of 8 ft reach the Revillagigedo Islands. Strong SW gap winds will also push into the northern Gulf of California overnight ahead of the dying front, then shift NW and spread into the central Gulf of California through tonight. Gentle breezes and moderate combined seas will persist elsewhere through late week, except for possibly strong gap winds in the Gulf of Tehuantepec Fri night. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... A tight gradient between high pressure north of the of the region and lower pressure over the tropics is supporting fresh to strong easterly gap winds across the Gulf of Papagayo and the Nicaraguan coast. A scatterometer satellite pass from 0330 UTC confirmed confirmed this, showing strong winds reaching about 120 nm offshore, with seas estimated to be 8 ft. Moderate N winds and seas of 4 to 6 ft persist into the Gulf of Panama and downstream to about 04N. Light to gentle winds and seas at 3 to 5 ft in moderate SW swell prevail for the rest of the offshore forecast waters. For the forecast, the larger scale pattern will continue to support fresh to strong NE to E winds across the Papagayo region and Nicaraguan coast mainly at night through Wed night, with seas up to 8 ft. These winds will diminish slightly thereafter as the high pressure shifts east. Fresh winds may pulse into the Gulf of Panama today, and then again Fri and Sat. Gentle to moderate winds will prevail elsewhere. Moderate long- period southerly swell will persist in all the offshore waters through the next several days. ...REMAINDER OF THE AREA... A dissipating cold front is moving southeastward across the waters north of 25N. Recent scatterometer passes indicated fresh to strong N-NE winds behind the front with moderate N-NE winds ahead of the front. Recent altimeter satellite data and ship observations indicated seas are currently 8 to 12 ft behind the front. A area of fresh to strong trades persist from 05N to 20N west of 125W with altimeter observations of 8 to 11 ft seas in mixed N swell and NE wind waves. Gentle winds and moderate seas in a SW swell are noted elsewhere. For the forecast, the front will stall and dissipate through early this morning. Winds will diminish north of 20N through mid week, while fresh to occasionally strong trade winds may persist through mid week from 05N to 15N west of 130W. These winds will diminish further through Fri as weak high pressure builds near 28N135W. Large NW reinforcing swell behind the front will gradually decay north of 20N by Thu, but combined seas in excess of 8 ft may persist from 05N to 20N west of 120W through Fri in a mix of NW swell and local trade wind seas. Gentle breezes and moderate combined seas in a mix of swell will persist elsewhere. $$ Christensen