Hurricane Sergio was the third strongest Pacific hurricane in the month of November on record. The twenty-fifth and final tropical cyclone, nineteenth named storm and eleventh hurricane of the 2006 Pacific hurricane season, Sergio developed from a tropical wave on November 13 about 460 miles (740 km) south of Manzanillo, Mexico, and steadily intensified as it tracked southeastward. It reached peak winds of 110 mph (175 km/h) on November 15, and subsequently began to weaken due to increased wind shear as it turned to the north. Sergio later turned to the west, remaining well off the coast of Mexico, and dissipated on November 20 about 320 miles (515 km) west-northwest of it originally formed. Sergio produced light rainfall along the coast of Mexico, though its effects were minimal. The formation of Sergio marked the 2006 season as the busiest in 12 years and the first season in which more than one tropical storm formed in November. Sergio, in addition to being the strongest hurricane after November 1, was also the longest-lived Pacific tropical cyclone in November, lasting a total of seven days. Meteorological history A tropical wave crossed Central America and entered the eastern Pacific Ocean on November 7. An area of convection along the wave tracked westward to the south of Central America and Mexico, and became more concentrated on November 12 while located about 400 miles (645 km) south of Acapulco. Later that day, Dvorak classification began on the disturbance, and the convection continued to organize. Early on November 13, the National Hurricane Center indicated the possibility of the system developing into a tropical depression. Thunderstorm activity briefly decreased, though late on November 13 the system acquired enough circulation and organized convection for it to be designated Tropical Depression Twenty-One-E while located about 460 miles (740 km) south of Manzanillo, Mexico. Operationally, the depression was not upgraded until eleven hours later. Initially, the tropical depression tracked to the northwest, and was forecast to peak as a 50 mph (80 km/h) tropical storm while continuing on a northwest motion. Located within an area of weak wind shear, deep convection increased near the center, and banding features became more pronounced. Anticyclonic flow aloft and a moist troposphere allowed the depression to intensity into Tropical Storm Sergio on November 14. Shortly after becoming a tropical storm, Sergio turned to the southeast, believed to be due to the flow associated with a