While executing a loop near Chuuk, the tropical depression intensified into Tropical Storm Tip, though the storm failed to organize significantly due to the influence of Tropical Storm Roger. Reconnaissance aircraft provided the track of the surface circulation, since satellite imagery estimated the center was about from its true position. After drifting erratically for several days, Tip began a steady northwest motion on October 8. By that time, Tropical Storm Roger had become an extratropical cyclone, resulting in the southerly flow to be entrained into Tip. An area of a tropical upper tropospheric trough moved north of Guam at the time, providing an excellent outflow channel north of Tip. Initially, Tip was predicted to continue northwestward and make landfall on Guam, though instead, it turned to the west early on October 9, passing about south of Guam. Later that day, Tip intensified to attain typhoon status.