late on august 8, the jma upgraded a low pressure area to a tropical depression west of guam, and the jtwc issued a tcfa. the system gradually drifted north and early on august 10, the jtwc started monitoring the system as a tropical depression and designated it with "13w". initially, the jma predicted the system to strengthen into a tropical storm, but on august 11, as it moved further north into cool waters and experienced unfavourable conditions, the jma issued their final advisory. later, the jtwc too issued their final warning on the system, reporting that it has moved into a subtropical ridge and was expected to dissipate into a remnant low. however, the jma continued to track the remants as a weak tropical depression over the next few days until the system dissipated on august 15.