of a closed low-level circulation, and early on October 5, the Joint Typhoon Warning Center (JTWC) issued its first warning on Tropical Depression Twenty-Three-W. While executing another 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. Owing to very favorable conditions for development, Typhoon Tip rapidly intensified over the open waters of the western Pacific Ocean. Late on October 10, Tip attained wind speeds equal to Category 4 strength on the Saffir–Simpson Hurricane Scale (SSHS), and it became a super typhoon on the next day. The central pressure dropped by from October 9 to 11, during which the circulation pattern of Typhoon Tip expanded to a record diameter of . Tip continued to intensify further, becoming a Category 5-equivalent super typhoon, and early on October 12, reconnaissance aircraft recorded a worldwide record-low pressure of with 1-minute sustained winds of , when Tip was located about west-northwest of Guam. In its best track, the Japan Meteorological Agency listed Tip as peaking with 10-minute sustained winds of . At the time of its peak strength, its eye was wide. Tip crossed the 135th meridian east on the afternoon of October 13, prompting the PAGASA to issue warnings on Typhoon Tip, assigning it the local name Warling. After peaking in intensity, Tip weakened to and remained at that intensity for several days, as it continued west-northwestward. For five days after its peak strength, the average radius of winds stronger than extended over . On October 17, Tip began to weaken steadily and decrease in size, recurving northeastward under the influence of a mid-level trough the next day. After passing