an extratropical cyclone around 06:00 UTC on October 7 and ultimately dissipating west of Baja California after twelve hours. Hurricane Susan An area of disturbed weather within the ITCZ developed into Tropical Storm Susan around 00:00 UTC on October 18. The storm intensified over subsequent days, becoming a hurricane around 00:00 UTC on October 20 and further developing into a major hurricane by 18:00 UTC the next day. Susan attained Category 4 strength with winds of six hours later, one of the strongest on record in the Central Pacific at that time. Although the powerful hurricane initially tracked northwest toward Hawaii, it sharply veered toward the southwest while succumbing to strong wind shear. Susan weakened rapidly, with winds falling from within 24 hours, and dissipated after 00:00 UTC on October 24. Tropical Storm Sergio The final storm of the 1978 season began as a disturbance, with origins as an African wave, southeast of Socorro Island on October 18. The system moved northwest, developing into Tropical Storm Sergio at 18:00 UTC that day and reaching peak winds of . Sergio maintained this intensity until it began to curve northward into cooler waters, which caused the system to transition into an extratropical cyclone by 00:00 UTC on October 21 and dissipate to the northwest of Baja California Sur after twelve hours. Other systems In addition to the system's numerous tropical cyclones, several tropical depressions were recorded. The first system developed well to the southwest of Daniel on June 29 and became a tropical depression the next day. It moved west to west-southwest and dissipated on July 2. On August 5, a disturbance developed within a very active portion of the ITCZ over the Central Pacific. The cyclone organized into a tropical depression on or before August 7 but failed to intensify into a tropical storm before dissipating on August 9. Regardless, it produced strong thunderstorms across the Hawaiian Islands, with rainfall amounts generally averaging . Another tropical depression formed on August 8 from a disturbance first identified three days prior. Like the depression in the East Pacific before it, the system curved west-southwest over cooler waters and dissipated after having only existed six hours. On September 7, a new area of disturbed weather was observed, and it intensified into the season's final tropical depression the next day. That cyclone curved north-northeast and dissipated on September 9. Storm names The following list of