000 AXPZ20 KNHC 210817 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Tue Feb 21 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 0815 UTC. ...SPECIAL FEATURES... Gulf of California Gale Warning: A cold front will move across Baja California Norte and the northern Gulf of California tonight into Wed morning. Strong to gale force winds are expected on either side of the front and N of 29N beginning tonight. Seas are forecast to quickly build to 10 ft in the SW flow by Wed morning. At this time, gale force winds in the 30 to 40 kt range are expected over parts of Baja California Norte mainly N of 30N, and also E of the Sierra Madre Occidental over northern Mexico. The winds blow between canyons over a high terrain (gap wind effect) and then intensify. Winds will diminish below gale force in the Gulf of California by Wed evening with seas subsiding to 8 or 9 ft. Please read the latest High Seas Forecast at https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more information on this event. Eastern Pacific Swell Event: A cold front will reach the northern forecast waters late today bringing an increase in winds and seas. Seas generated by gale force winds behind the front offshore California will propagate into the forecast waters N of Punta Eugenia by Wed afternoon. At this time, seas of 12 to 18 ft in NW swell are forecast to cover the waters N of 28N and E of 126W. This swell event will continue to spread southward on Wed night into Thu, with seas of 8 to 12 ft between Cabo San Lazaro and Punta Eugenia by Thu morning, and seas of 10 to 14 ft N of Punta Eugenia. Additional pulses of northerly swell will maintain an area of 12 ft seas or greater affecting the north waters roughly N of 26N between 118W and 137W through Sat morning. Please read the latest High Seas Forecast at https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more information on this event. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A surface trough extends from 07N78W to 00N112W. The ITCZ continues from 00N112W to 01N140W. Scattered moderate convection is noted from 03N to 06N between 105W and 111W, and from 05N to 10N between 130W and 140W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A Gale Warning is in effect for the northern Gulf of California. A swell event will affect the offshore waters of Baja California on Wed. Please, see the Special Features section for more details on these two events. Fresh to locally strong northerly winds prevail over the Tehuantepec region. Moderate to fresh winds are noted off Cabo Corrientes. Gentle to moderate winds are found elsewhere. Seas are in the 4-6 ft range over the open waters, and 1-2 ft over the Gulf of California. For the forecast, aside from the gales in the northern Gulf of California, a set of NW swell will propagate into the waters off Baja California by midweek, with seas in excess of 12 ft impacting much of the waters north of 26N from the middle to end of the week. Light to gentle winds across the open waters off Mexico will increase modestly beginning today. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Strong to near- gale force NE winds prevail across the Gulfs of Papagayo and Fonseca, extending downwind to near 90W along with seas of 8 to 9 ft. Moderate to fresh N winds are near the Azuero Peninsula and downwind to near 05N, where seas are in the 5 to 6 ft range. Light to gentle winds prevail elsewhere along with seas of 4-5 ft. For the forecast, strong to near-gale force NE to E winds in the Gulf of Papagayo region will persist most of the forecast period with rough seas. Fresh N to NE winds are expected near the Azuero Peninsula tonight. Swell generated from the Gulf of Papagayo will continue to propagate into the Guatemala and El Salvador waters through Sat. REMAINDER OF THE AREA... A ridge dominates the waters N of 20N. The pressure gradient between the ridge and lower pressure in the vicinity of the ITCZ supports an area of fresh to strong trades N of the ITCZ to about 20N and W of 125W. Seas are 8-10 ft in a mix of long- period N swell and NE wind waves over these waters. Moderate to fresh winds are N of 20N and W of 120W, with seas of 7-9 ft. Elsewhere, winds are moderate or weaker with seas of 6-8 ft primarily in northerly swell. For the forecast, fresh to locally strong NE to E trade winds are forecast to persist over the west-central waters through the week, with little change to seas within this part of the area. Large northerly swell will propagate into the northern waters by midweek, with seas in excess of 12 ft impacting much of the waters north of 26N from the middle to end of the week. Please, see the Special Features section for more details. $$ AL