国際日付変更線
On August 11, the Japan Meteorological Agency (JMA) reported that a tropical depression had developed near the International Date Line about to the northwest of Honolulu, Hawaii. Over the next day, the system moved northwestwards and was last noted before it moved into the Western Pacific basin. On September 12, the JMA had reported that another tropical depression had developed east of the International Date Line, On October 3, according to its best track, the JMA started tracking a tropical depression to the east of the International Date Line. The system moved into the West Pacific, where it eventually became Typhoon Songda.