 A tropical disturbance formed along the near equatorial trough on April 20 well to the south of Guam . The system slowly increased in organization , becoming a tropical depression on April 26 . The system quickly developed thereafter , becoming a typhoon on April 27 while moving northward . The system reached its peak intensity on April 28 . The subtropical ridge built to its northwest , steering Ken to the west . South @-@ westerly vertical wind shear led to a weakening trend to begin on April 29 . On April 30 , Ken 's low level circulation was exposed , no longer having any thunderstorms near the center . The remnant low drifted westward , dissipating by May 3 . 
