Tropical Weather Discussion...Corrected
Status
Issued Active alertStart Time
Sat 05/09/2026 06:05 PM EDTEnd Time
Sun 05/10/2026 12:05 AM EDTImpacts
Informational
Full Alert Message
Tropical Weather Discussion...Corrected NWS National Hurricane Center Miami FL 2205 UTC Sat May 9 2026 Corrected Offshore Waters Within 250 nm of Mexico section 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 1800 UTC surface analysis and satellite imagery through 2200 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from low pressure in northwest Colombia southwestward to 07N78W to 06N86W to 07N93W to 09N105W to 08N115W and to 07N125W, where it transitions to the ITCZ to 06N135W and to beyond 06N140W. Numerous moderate to strong convection is from 09N to 15N between 100W-109W. Scattered moderate to isolated strong convection is within 120 nm south of the trough between 83W-87W, and from 03N to 04N between 88W-93W. Scattered moderate convection is within 180 nm north of the ITCZ between 130W-140W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO...Corrected Latest scatterometer satellite data shows moderate to fresh northwest to north winds offshore Baja California due to the pressure gradient between a broad ridge associated to a 1026 mb high that is centered near 32N134W and relatively lower pressure in the Baja California region. Seas with these winds are mostly 5 to 7 ft in northwest swell. Gentle to moderate northerly winds prevail from Baja Sur and Cabo San Lucas southward beyond the Revillagigedo Islands and Cabo Corrientes to near 17N, where seas are 4 to 6 ft in northwest swell mixed with south to southwest long-period swell. Light to gentle variable winds are in the Gulf of California. Seas are 1 to 3 ft in the Gulf, except for slightly higher seas of 2 to 4 ft in the southern portion of the gulf. Winds become gentle to moderate and northerly in direction from the entrance to the Gulf to Cabo Corrientes, where seas are 4 to 6 ft in long-period south to southwest swell. Gentle to moderate north to northeast winds along with moderate seas in a mix of northwest and southwest swell are elsewhere, except for gentle southeast to south winds in the Gulf of Tehuantepec, and light and variable winds south of 17N between 99W and 106W. Increasing numerous moderate to strong convection is noted over the outer waters to the southwest of the Tehuantepec region, and to the south of Oaxaca, and Guerrero. A surface trough is within this general area. Favorable dynamics aloft with a subtropical jet stream branch should sustain this convection through the remainder of the day and during tonight, or possibly longer. For the forecast, the present gradient in place will support moderate to fresh northwest to north winds off Baja California Norte through Mon. Mostly moderate seas will be over these waters through the period. The gradient will weaken going into the middle part of the week allowing for generally gentle to moderate winds across the Baja waters. Large northwest swell will move into the waters just northwest of Isla Guadalupe this evening through Sun evening, then taper off. Looking ahead, strong to near gale gap winds and building seas are expected in the Gulf of Tehuantepec Tue through Wed night as a cold front moves through southern Mexico. ....OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Latest scatterometer satellite data indicates mostly light to gentle winds over the offshore waters of Central America and southward to Ecuador, with fresh east gap winds across the Papagayo region to south of the Gulf of Fonseca, and gentle to moderate north to northeast winds filtering through the the Gulf of Panama and to near 05N. Fresh north to northeast are embedded within the gentle to moderate winds from 05N to 08N between 79W and 80W. Combined seas over these waters are 5 to 6 ft, except for higher seas of 7 to 8 ft in long-period southwest swell from the Equator to near 03.4S and east of 88W to near the coast of South America as seen in the latest altimeter satellite data passes. Scattered moderate to isolated strong convection is well south of Costa Rica near the monsoon trough. For the forecast, moderate to fresh easterly gap winds will pulse at night to strong across the Papagayo region through the early part of the upcoming week. Elsewhere, gentle to moderate winds and moderate seas in southerly swell are expected. Large long-period southwest swell near the southern waters of the Galapagos will subside late tonight. ...REMAINDER OF THE AREA... High pressure of 1026 mb is north of the area near 32N134W. The pressure gradient between the high pressure and relatively lower pressure in the vicinity of the ITCZ is generally maintaining moderate to fresh trades from 08N to 24N west of 130W and similar trades from 10N to 27N between 120W and 130W as noted in the latest scatterometer satellite data. Altimeter data passes reveal seas of 7 to 9 ft in mixed east and southwest swell over this area. Gentle to moderate winds along with seas of about 5 to 7 ft are elsewhere north of 11N per latest altimeter satellite data passes and a few SoFar Spotter buoy observations. Higher seas of 6 to 8 ft due to long-period southwest swell are south 11N. Convection over this area is as described above under ITCZ/Monsoon Trough. For the forecast, the ridge will change little across the region through early Sun, then weaken and begin to drift northward Sun through Tue. The associated weakened pressure gradient will support moderate trades, fresh at times, north of the ITCZ to about 24N and west of 120W Sun through early next week, with seas of 7 to 8 ft across this area. Mainly gentle to moderate winds and moderate seas will prevail elsewhere during the upcoming week. Rough seas are expected in building southerly swell south of the Equator tonight, subsiding early on Sun, then another pulse of the swell will begin to approach the waters from 01S to 03.4S between 120W and 108W starting Sun afternoon.