 Typhoon Yagi was an intense typhoon , the strongest of the 2006 Pacific typhoon season , which reached the equivalence of Category 5 on the Saffir @-@ Simpson Hurricane Scale . Forming out of a tropical depression on September 16 , Yagi quickly strengthened as it executed a slow clockwise loop over the open waters of the western Pacific Ocean . On September 19 , Yagi strengthened into a typhoon as a subtropical ridge steered the storm towards the west . Two days later , the storm reached its peak intensity with winds of 195 km / h ( 120 mph 10 @-@ minute winds ) with a minimum pressure of 910 hPa ( mbar ) . The typhoon gradually weakened as it recurved towards the northeast and was downgraded to a severe tropical storm on September 24 and became extratropical the next day . The storm was last noted near the Aleutian Islands on September 27 . The typhoon caused severe damage on the island of Chichijima but no injuries were reported as a result of the storm . 
