in December, the origins of Tropical Storm Val. Tropical Storm Val was first spawned by an outbreak of Arctic air pushed southeastward across Asia on December 18. Within five days, this cold air mass extended from the southern Philippine Islands to the northern Marianas. The cold air quickly diminished, which spawned convection and multiple surface circulations across the monsoon trough. Thunderstorm activity consolidated on December 21, and an increase in organization prompted the issuance of a TCFA the next day. Later on December 22, both the JTWC and JMA upgraded the disturbance into a tropical depression. On December 24, the JMA upgraded the depression into Tropical Storm Val. Around the time, JTWC and JMA reported that Lee attained its peak intensity of . Also on December 24, Val, which was moving westward at around , grounded to a halt. The storm's center became less defined, which resulted in a weakening trend. After tracing northward, Val was downgraded to a tropical depression on December 27. The JTWC ceased tracking Val on December 26, with the JMA doing the same the next day. Storm names During the season 26 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 which started in 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 1992 season. This is the same list used for the 1984 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 Because Typhoons Unsang and Yoning made extensive damage within the Philippines, the PAGASA later retired the names Unsang and Yoning and was replaced by Ulpiang and Yerling for the 1992 season. Season