--------------------------------------------------------------------------- TROPICAL WEATHER DISCUSSION (EASTERN PACIFIC AREA) MESSAGES T1T2: AX A1A2: PZ Date: 2026-04-20 --------------------------------------------------------------------------- Message File: T_AXPZ20KNHC200324_C_KWBC_20260420032433_38666572-1589-TWDEP.txt ****0000005739**** AXPZ20 KNHC 200324 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Mon Apr 20 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 0300 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: High pressure ridging will build southward along eastern Mexico in the wake of a late- season cold front that is moving across the Gulf of America. The pressure gradient between the ridge and relatively lower pressure south of Mexico will tighten enough to support a brief occurrence of gale-force northerly winds in the Gulf of Tehuantepec tonight into Mon morning. The gradient will then relax enough as high pressure north of the area shifts eastward during Mon allowing for the gale winds to diminish to strong speeds. Seas with this upcoming gale event are expected to peak to around 11 or 12 ft. Lingering rough seas will subside Tue. Marine interests transiting through, or near the Gulf of Tehuantepec should take the necessary action to avoid hazardous marine conditions over the affected waters. Please read the latest High Seas Forecast issued by the National Hurricane Center at website https:///www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from low pressure in northwest Colombia southwestward to 08N83W to 1010 mb low pressure near 04N95W and to 04N111W, where it transitions to the ITCZ to 05N126W to and to beyond 05N140W. Scattered moderate convection is depicted from 00N to 07.5N between 87W and 98W. Numerous moderate convection is depicted from 01.5S to 08N between 113W and 135W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section above for information on a soon to begin gap wind gale-event in the Gulf of Tehuantepec. Relatively weak high pressure is over the area. The pressure gradient between the high pressure and lower pressures over Mexico is generally supporting gentle to moderate northwest winds west of the Baja California Peninsula. Elsewhere over the Pacific, winds are moderate or weaker in speeds. Seas are 3 to 5 ft over the offshore waters, with northwest swell west of Baja California and in mixed south and northwest swell elsewhere. Mostly light and variable winds are in the Gulf of California along with seas 1 to 3 ft. For the forecast, aside from the upcoming Tehuantepec gale event, rather quiet conditions will remain over the forecast waters through Tue. A set of northwest swell will move through the waters west of Baja California Norte Tue night into Wed, but it will be subsiding as it does. Seas are expected to peak to around 8 ft with this swell. Fresh to locally strong northwest winds are forecast over the Pacific waters of Baja California beginning Wed night. Northwest winds will pulse to moderate to fresh speeds at night offshore southwestern Mexico Tue through Fri. Elsewhere, mostly light to gentle west to northwest winds are expected through the end of the week. ....OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Gentle to moderate north to northeast winds are found over the Gulf Panama along with seas around 3 ft. Light to gentle variable winds prevail elsewhere along with seas 4 to 6 ft also due to a long-period south to southwest swell. Scattered showers and patches of light rain are in the vicinity of the Galapagos Islands. For the forecast, winds may pulse to fresh speeds in the Gulf of Papagayo region late at night and into the mornings through Tue. Otherwise, rather tranquil conditions are expected to hold over the Central American and the equatorial waters for the next few days. ...REMAINDER OF THE AREA... A late-season cold front is over the northwest part of the area along a position from near 30N130W to 25N140W. It is preceded by gentle to moderate southwest winds north 27N and east to near 127W, and followed by mostly moderate northwest to north winds. Seas are 4 to 6 ft with these winds. High pressure ridging is building southeastward behind the front while relatively weak high pressure is to its southeast reaching east to near 111W and south to near 16.5N. A weak pressure gradient between the ridge and relatively lower pressure to its south associated to the ITCZ is sustaining an area of moderate northeast to east trades over the western part of the domain from 13N to 17N west of about 123W. Seas within these trades are 5 to 6 ft in mixed swell. For the forecast, little overall change is expected in the present synoptic pattern into early part of the week, with respect to winds and seas. The aforementioned cold front will move east- southeastward and weaken as moves across the north-central and northeast forecast waters from late Mon through Tue. The main impacts from this front will be from a set of large northwest to north swell that will trail the front as seas are expected to build to a maximum of 12 or 13 ft on Mon night over the far northwest waters. Seas of 8 ft and greater will reach to a line from near 30N120W to 22N130W and to 21N140W by late Tue, then begin to subside through Wed. $$ KRV ########################### END OF MESSAGE SET ############################