The 1978 Pacific typhoon season has no official bounds; it ran year-round in 1978, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
33 tropical depressions formed this year in the Western Pacific, of which 29 became tropical storms. 15 storms reached typhoon intensity, of which 1 reached super typhoon strength. Many of the storms either remained at sea or failed to do any damage.
In the Philippines, Typhoon Atang killed 3 people and left 3,500 homeless. A lengthened ex-”FS” ship of Compania Maritima was caught in it, the MV Leyte. She was wrecked in the southwestern portion of Sibuyan Island trying to reach shelter. She was then on a Manila-Cebu voyage.
Agnes formed on July 24, made a complete loop, and struck China on July 29 with winds of 55 mph after peaking at 60 mph. It dissipated the 30th. In Hong Kong Tropical Storm Agnes killed 3 people.
Irma, the eighth typhoon of the 1978 season, developed in the monsoon trough southeast of Taiwan. It made landfall in Honshu, Japan. With winds of up to 120 km/h, Typhoon Irma killed at least 6 people and made about 3,000 homeless. Four people were missing and about 100 were injured by floods and landslides in southwestern Japan. It destroyed or damaged 1,597 homes and left 6,266 homes flooded. Irma smashed windows, overturned cars, and capsized several fishing boats. Several athletes at the Japan-China Friendship Track and Field Meet in Kitakyushu were injured when a freak gust blew them ten feet in the air. A Liberian-registered tanker was swept from its moorings off the port of Kure and drifted for nearly 5 kilometers before running aground off a small island in the Inland Sea. Irma remained a typhoon for only 12 hours becoming the shortest-lived typhoon of the season.
Tropical Depression 28 developed October 15. Three and a half days later, it strengthened into a tropical storm. Rita became a typhoon late on October 19. Rita reached Category 5 status on October 23, reaching a minimum central pressure of 878 millibars, only 8 mb higher than Typhoon Tip's record set in 1979. After spending over three consecutive days at that intensity, Rita weakened to a Category 4 and smashed ashore on Luzon. Rita stayed a typhoon during its entire passage over the Philippines and emerged into the South China Sea as a minimal typhoon. Rita then decayed slowly and dissipated as a depression near the coast of Vietnam. The typhoon caused considerable damage and loss of life in the Philippines, though exact numbers are unknown.
During the season 28 named tropical cyclones developed in the Western Pacific and were named by the Joint Typhoon Warning Center, when it was determined that they had become tropical storms. These names were contributed to a revised list from late-1950. However the JTWC changed their naming scheme by the next year, now including both female and male names.
One name, Susan, developed over the Central Pacific and was named from this list. The storm never became apart of the West Pacifc basin.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration uses its own naming scheme for tropical cyclones in their area of responsibility. PAGASA assigns names to tropical depressions that form within their area of responsibility and any tropical cyclone that might move into their area of responsibility. Should the list of names for a given year prove to be insufficient, names are taken from an auxiliary list, the first 6 of which are published each year before the season starts. Names not retired from this list will be used again in the 1982 season. This is the same list used for the 1974 season. PAGASA uses its own naming scheme that starts in the Filipino alphabet, with names of Filipino female names ending with "ng" (A, B, K, D, etc.). Names that were not assigned/going to use are marked in gray.