The agency escalated these warnings as the storm neared, culminating in the raising of the No. 10 signal—the HKOs highest warning—on October 13 while the center of the storm lay 65 km (40 mi) away.[3] Dot was the sixth storm since 1946 to trigger the No. 10 signal and the second in 1964, with the other being Typhoon Ruby.[4][5]:66 The Observatory deescalated warnings as the storms effects lessened following landfall, with their last warning signal lowered after 6:25 p.m.