on july 11, both the jma and jtwc upgraded a tropical disturbance to a tropical depression which was near minamitorishima. on july 12, both the jma and jtwc upgraded the system to a tropical storm and named it ma-on. early on july 13, the jma upgraded ma-on to a severe tropical storm. late on july 13, both the jma and the jtwc upgraded ma-on to a typhoon. after absorbing tokage, ma-on reached its peak strength on july 16. the pagasa named it ineng on july 17.