The origins of Hurricane Tico were from a weak tropical disturbance that crossed Costa Rica into the Pacific Ocean on October 7. It tracked westward through an area of progressively warmer water temperatures, and by October 11 the system was sufficiently organized to be declared Tropical Depression Twenty-One, about 575 mi (930 km) south of the Mexican port of Acapulco. The depression initially maintained a west-northwest motion, although on October 12 it turned sharply northward, due to the influence of a strong trough moving eastward through Mexico. Gradually organizing, the depression was upgraded to Tropical Storm Tico on October 13 by the Eastern Pacific Hurricane Center (EPHC).
