on july 11, a low-pressure zone was formed near the mariana islands, and the us naval research laboratory gave it a tropical disturbance number of 98w. at 8 o'clock on the morning of july 14, the japan meteorological agency upgraded it to a tropical depression. at this point the system moves to the approximate west. at 8 pm, the joint typhoon warning center gave its development rating "low". at 8 o'clock on the morning of july 15, the japan meteorological agency issued a gale warning, and the central meteorological bureau of taiwan upgraded it to a tropical depression, given the number td10 . at 3 pm, the joint typhoon warning center upgraded the rating to "medium". at 10 pm, the hong kong observatory upgraded it to a tropical depression.