to the north. The typhoon briefly threatened Hong Kong on the 28th, but vertical shear caused the low level circulation and upper-level circulation to separate, leaving a rapidly weakening Nina to turn southward over the South China Sea. The storm finally dissipated on the 30th, but not after causing 1,036 casualties and extensive crop damage on its path of 1.12 billion Philippine Pesos (1987 pesos). Tropical Depression Ogden Ogden hit Philippines and later dissipated in Vietnam. Typhoon Phyllis (Trining) Affecting the Philippines three weeks after Typhoon Nina devastated the archipelago, Typhoon Phyllis prompted typhoon alerts for the Visayans. Offshore northern Samar Island, a ferry boat carrying 50 people sank, though 27 were rescued, the bodies of 10 drowning victims were recovered and 13 others were feared dead. Storm names During the season 23 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 1979. Philippines 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 1991 season. This is the same list used for the 1983 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 . Retirement Owing to their extensive damage and death toll within the Philippines, the PAGASA later retired the names Herming and Sisang. Replaced names were selected as Helming and Sendang for the 1991 season. The name Katring, which replaced Karing in 1983 for still unknown reasons, was removed from this list (List I). It was previously included in another list (List IV) as an auxiliary name, replacing Kading which was retired after the 1978 season. Because of this, the name Karing was reinstated in this list for the 1991 season.