Tropical Depression 15W formed from a well-defined low pressure system located about 50 nautical miles (95 km) east of Yap on September 6. It strengthened into a tropical storm later that day. The system was classified as a tropical storm by the Joint Typhoon Warning Center on September 6, while the Japan Meteorological Agency, the agency responsible for naming typhoons, did not upgrade the system until a day later. Tropical Storm 15W entered the Philippine area of responsibility on September 7. It was named Kiko by PAGASA first before being named Khanun by the JMA. Khanun is the Thai name for jackfruit. Typhoon Khanun (Kiko) made landfall in eastern China on September 11 at 0600 UTC (1400 HKT). Khanun dissipated the next day, September 12.