--------------------------------------------------------------------------- TROPICAL WEATHER DISCUSSION (EASTERN PACIFIC AREA) MESSAGES T1T2: AX A1A2: PZ Date: 2024-03-29 --------------------------------------------------------------------------- Message File: T_AXPZ20KNHC290226_C_KWBC_20240329022652_21954772-9221-TWDEP.txt ****0000006362**** AXPZ20 KNHC 290226 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 0405 UTC Fri Mar 29 2024 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 0200 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Gale conditions are forecast to persist in the Tehuantepec region tonight into Fri morning, with seas building to 10 to 15 ft overnight. Swell generated by this gap wind event will spread southwestward, creating 8 to 11 ft seas as far west as 100W and as far south as 09N by Fri morning. Winds and seas should begin to diminish late Fri afternoon. Marine interests in the Tehuantepec area, especially local fishermen, need to take necessary action to avoid these hazardous marine conditions. Large Northerly Swell Event: A series of cold fronts will drop S of 30N across the northerly waters the next few days with reinforcing sets of northerly swell. Seas will build to 12 ft or greater S of 30N Fri night, reaching to 25N between 120W and 136W by Sat evening when peak seas are forecast to build to around 16 ft along 30N. These seas will continue to spread SE through the end of the weekend into early next week before subsiding. Wave periods will be around 12 seconds. Very hazardous marine conditions will occur with these waves over the open waters, and also at the coast of Baja California Norte likely resulting in dangerous surf conditions. Please consult products from your national weather service for more details on conditions near the coast. Please read the latest High Seas Forecast issued by the National Hurricane Center at https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details on both areas. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... An equatorial trough extends from northern Colombia to 05N85W to 03N104W. The ITCZ is south of the Equator and runs westward from 03N104W to the Equator near 137W. Scattered moderate isolated strong convection is from the Equator to 07N between 90W and 122W. Scattered moderate convection is from 02N to 09N between 131W and 140W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale Warning is in effect for the Gulf of Tehuantepec. Please read the Special Features section for more details. A ridge continues to dominate the offshore forecast waters of Baja California producing gentle to moderate northerly winds, locally fresh nearshore western Baja California, with seas of 5 to 7 ft. For the Gulf of California, gentle to moderate NW winds and 2 to 4 ft seas are present across central and southern parts of the Gulf, while light to gentle winds and seas of 1 to 2 ft exist at the northern Gulf. Other than the Gale Warning area in the Tehuantepec region, light to gentle winds and seas at 4 to 6 ft in mixed moderate swells prevail for the southern Mexico offshore waters. For the forecast, gale conditions and rough to very rough seas will persist in the Tehuantepec region through Fri morning. A strong cold front is forecast to move through the offshore waters of Baja California and northern Gulf of California this weekend, bringing with it increasing winds and large NW swell, including fresh to strong winds ahead of the front in the northern Gulf of California Fri night through early Mon. This swell event could generate very rough seas at the outer offshore waters north of Punta Eugenia by Sun morning. Winds may freshen near Cabo Corrientes early next week. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR Abundant moisture in a southerly wind flow is triggering isolated to scattered showers in the vicinity of the Galapagos Islands. Otherwise, mainly light to gentle SE to S winds and 3 to 6 ft seas prevail across the offshore waters of Central America, Colombia and Ecuador. For the forecast, starting early on Fri, increasing gap winds and rising seas will occur in the Papagayo area, and Gulf of Panama as high pressure builds north of the area. Swell generated by gap winds at the Tehuantepec region will cause rough seas across the far southwestern offshore waters of Guatemala and El Salvador tonight through Fri. Elsewhere, convergent southwesterly winds along with abundant moisture will continue to support sporadic showers and isolated thunderstorms near the Galapagos Islands and in the Costa Rica and West Panama offshore waters through at least Fri. Winds and seas could be higher near thunderstorms. Light to gentle winds and slight to moderate seas will prevail across the remainder of the waters. ...REMAINDER OF THE AREA... Please read the Special Features section for details on an upcoming large northerly swell event over the northern waters. A ridge dominates the northern forecast waters while a weakening cold front extends from 30N128W to 25N140W. A few showers are along the frontal boundary. Moderate northerly winds at most follow the front with seas of 5 to 7 ft, except building to around 8 ft near 30N between 130W and 140W. The pressure gradient between the ridge and lower pressures near the equatorial trough/ITCZ maintains moderate to fresh trades from 04N to 22N W of 130W. Seas are 7 to 8 ft within these winds. Mainly moderate winds and 6 to 7 ft seas prevail elsewhere. For the forecast, the surface ridge will weaken somewhat while shifting S with the series of fronts mentioned above move through the northern waters along with the associated significant northerly swells. Fresh to strong winds will accompany the fronts tomorrow evening through the weekend. The northerly swells will support seas of 7 to 10 ft across the majority of the waters N of the ITCZ early next week. Trades will freshen next week from the ITCZ to around 20N and W of 110W as ridging rebuilds in the wake of the fronts. $$ Lewitsky ########################### END OF MESSAGE SET ############################ --------------------------------------------------------------------------- Message File: T_AXPZ20KNHC290718_C_KWBC_20240329071953_21954772-9238-TWDEP.txt ****0000005734**** AXPZ20 KNHC 290718 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Fri Mar 29 2024 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 0650 UTC. ...SPECIAL FEATURES... Gulf of Tehuantepec Gale Warning: Gale conditions are forecast to persist in the Tehuantepec region through this morning, with seas peaking around 14 to 15 ft in the next few hours. Swell generated by this gap wind event will spread southwestward, creating 8 to 11 ft seas as far west as 100W and as far south as 09N by later this morning. Winds and seas will gradually diminish through early Sat. Marine interests in the Tehuantepec area, especially local fishermen, need to take necessary action to avoid these hazardous marine conditions. Large Northerly Swell Event: A series of troughs/cold fronts will drop S of 30N across the northerly waters the next few days with reinforcing sets of northerly swell. Seas will build to 12 ft or greater S of 30N tonight, reaching to 25N between 119W and 137W by Sat evening when peak seas are forecast to build to around 16 ft along 30N. These seas will continue to spread SE through the end of the weekend into early next week before subsiding. Wave periods will be 12 to 14 seconds. Very hazardous marine conditions will occur with these seas over the open waters, and also at the coast of Baja California Norte, likely resulting in dangerous surf conditions. Please consult products from your national weather service for more details on conditions near the coast. Please read the latest High Seas Forecast issued by the National Hurricane Center at https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details on both areas. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... An equatorial trough extends from northern Colombia to 05N85W to 04N93W. The ITCZ runs westward from 04N93W to 03N125W to 00N136W. Scattered moderate isolated strong convection is from 01N to 07N between 88W and 126W, and from 02N to 10N between 130W and 138W. ...OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale Warning is in effect for the Gulf of Tehuantepec. Please read the Special Features section for more details. A ridge continues to dominate the offshore forecast waters of Baja California producing gentle to moderate northerly winds, with seas of 5 to 7 ft in NW swell. For the Gulf of California, mainly light to gentle variable winds and 1 to 3 ft seas prevail. Other than the Gale Warning area in the Tehuantepec region, light to gentle winds and seas at 4 to 6 ft in mixed moderate swells prevail for the southern Mexico offshore waters. For the forecast, gale conditions and rough to very rough seas will persist in the Tehuantepec region through this morning. A series of troughs/cold fronts are forecast to move through the offshore waters of Baja California and Gulf of California through the weekend, bringing with it increasing winds and large NW swell, including fresh to strong winds ahead of the front in the northern Gulf of California tonight through early Mon. This swell event could generate very rough seas at the outer offshore waters north of Punta Eugenia by Sun morning. Winds may freshen near Cabo Corrientes early next week. ...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR Moderate to fresh offshore winds are noted in the Gulf of Papagayo as well as in the Gulf of Panama. Elsewhere, light and variable winds prevail. Seas of 3 to 5 ft in S-SW swell dominate the offshore waters. For the forecast, elevated seas due to a Gulf of Tehuantepec gap wind event will propagate through the outer waters of Guatemala and El Salvador through this evening. Winds will pulse to fresh to strong in the Papagayo region later this morning through early Wed, with seas occasionally to 8 ft. Moderate to fresh N-NE winds in the Gulf of Panama to near the Azuero Peninsula will increase to fresh to strong tonight through Sat night with seas of 5 to 7 ft. Elsewhere, light to gentle winds and 3 to 6 ft seas will prevail. ...REMAINDER OF THE AREA... Please read the Special Features section for details on an upcoming large northerly swell event over the northern waters. A ridge dominates the northern forecast waters while a trough extends from 30N122W to 27.5N130W to 25N140W. A few showers are along the trough. Associated seas of 7 to 9 ft in northerly swell are spreading S of 30N as described above. The pressure gradient between the ridge and lower pressures near the equatorial trough/ITCZ maintains moderate to fresh trades from 05N to 22N W of 125W. Seas are 7 to 8 ft within these winds, as measured by recent altimeter data. Mainly gentle to moderate winds and 5 to 7 ft seas prevail elsewhere. For the forecast, other than the series of troughs/cold fronts and associated large northerly swell mentioned above, the ridge will weaken somewhat and shift S a bit due to the passing boundaries. The ridge will rebuild next week, helping to freshen trades N of the equatorial trough/ITCZ. The northerly swells will support seas of 7 to 10 ft across the majority of the waters N of the ITCZ early next week. $$ Lewitsky ########################### END OF MESSAGE SET ############################