--------------------------------------------------------------------------- TROPICAL WEATHER DISCUSSION (EASTERN PACIFIC AREA) MESSAGES T1T2: AX A1A2: PZ Date: 2026-06-29 --------------------------------------------------------------------------- Message File: T_AXPZ20KNHC290418_C_KWBC_20260629041917_9109880-7087-TWDEP.txt ****0000005874**** AXPZ20 KNHC 290418 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Mon Jun 29 2026 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 0000 UTC surface analysis and satellite imagery through 0330 UTC. ...TROPICAL WAVES... A tropical wave is near 98W from near Puerto Angel, Mexico southward, moving westward around 15 kt. Scattered moderate to isolated strong convection is seen from 06N to 10N between 90W and 102W. A tropical wave is near 123W from 19N southward, and moving westward at 10 to 15 kt. Scattered to numerous moderate to isolated strong convection is noted from 05N to 14N between 120W and 131W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...Corrected A monsoon trough extends westward from southeastern Panama to 09N85W to 07N91W. An ITCZ continues west-northwestward from 07N91W to 07N97W, then from 07N99W to 11N122W, and from 10N124W to 05N140W. Scattered moderate to isolated strong convection is flaring up south of the monsoon trough from 01N to 04N between 80W and 85W, and near the ITCZ from 05N to 16N between 106W and 120W. Scattered to numerous moderate to isolated strong convection is found near the rest of the ITCZ from 00N to 07N west of 130W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... The pressure difference between high pressure ridging over the Gulf of America and relatively lower pressure in southeastern Mexico, southward to the monsoon trough over the eastern Pacific is supporting fresh to strong gap winds in the Gulf of Tehuantepec. Seas up to 8 ft prevail with these winds. In the Gulf of California, moderate to fresh southwest winds are over the northern portion from 30N to 31N along with seas of 2 to 4 ft. The pressure gradient is slightly tighter over that portion of the Gulf due to the presence of the diurnal trough. Seas over the rest of the Gulf are also 3 to 4 ft, except at the entrance, where higher seas of 4 to 6 ft in long-period south to southwest swell are present. Latest scatterometer satellite data passes generally reveal light to gentle winds are elsewhere over the Mexican offshore waters along with seas of 4 to 6 ft in long- period south to southwest swell. For the forecast, fresh to strong N to NE gap winds and moderate to rough seas are expected in the Gulf of Tehuantepec region from the nighttime to late morning hours each night and morning through Sat. Fresh to strong W to SW winds should pulse in the northern Gulf of California until early Mon morning, and again Mon night through early Tue morning. Gentle to moderate with locally fresh NW to N winds and moderate seas will persist west of Baja California through the end of the week. NW swell is going to create rough seas at the far northwestern waters off Baja California Norte Mon and Tue. ....OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh to strong northeast gap winds are across the Gulf of Papagayo and off the southern coast of Nicaragua. Afternoon altimeter satellite data indicates seas of 8 to 9 ft downstream of these winds, roughly from 08N to 11N between 87W and 95W. Moderate or weaker winds are elsewhere. Seas are 6 to 8 ft in long-period southerly swell over the equatorial waters as detected by multiple altimeter satellite data passes, and 5 to 6 ft in long-period southwest swell across the remainder of the offshore waters. For the forecast, fresh to strong gap winds and moderate to rough seas will continue in the Gulf of Papagayo region through the weekend. NE to E swell generated by these winds are anticipated to create moderate to locally rough seas well downstream to near 90W. Farther south, long-period southerly swell should keep moderate to locally rough seas near the Galapagos Islands and off Ecuador most of the week. Sporadic heavy showers and strong thunderstorms will persist near the Colombia coast, spreading to south of Costa Rica and Panama by Mon evening. ...REMAINDER OF THE AREA... Broad ridging dominates the remainder of the area north of about 20N. The moderate pressure gradient between the ridge and lower pressure in the vicinity of the monsoon trough/ITCZ is supporting moderate to fresh trades over most of the area north of 10N and west of 119W. Seas are 6 to 8 ft west of 112W due to the combination of long-period north to northeast swell with trade wind generated waves. To the south, southeast swell is inducing seas up to 10 ft south of 02N between 87W and 120W as noted in various altimeter satellite data passes. Elsewhere, winds are mostly moderate or weaker. Seas are 5 to 7 ft primarily in northwest to north swell, except mixed with east swell west of 129W. For the forecast, the tropical wave near 122W is forecast to undergo possible gradual development during the next couple of days, and a tropical depression could form by the middle portion of this week while the system moves generally west-northwestward and then northwestward. Environmental conditions are forecast to become less conducive for development by late week as the system encounters increasing shear and cooler waters. Outside of this system, little change in winds are expected for the next several days. Southerly swell moving through the far south- central waters is expected to begin to decay during the early part of the week. $$ Chan ########################### END OF MESSAGE SET ############################