 Forming along the western end of the monsoon trough in the Philippine Sea , the convective disturbance was first noted on September 14 . By the afternoon of September 16 , the system had organized into a tropical depression , and by that night a tropical storm . As a compact system , rapid intensification continued , with Ken becoming a typhoon on the evening of September 17 and a major typhoon on September 18 . The cyclone up to this point had a history of progressing slowly west @-@ northwest , but Ken eventually stalled on September 20 and became a larger cyclone , possibly due to the ingestion of some cooler , drier air from its periphery . As a mid @-@ latitude trough to its north deepened , Ken took off to the northeast towards Okinawa . On September 23 , Ken brought significant rains to the island when 282 millimetres ( 11 @.@ 1 in ) were measured at Kadena . Weakening ensued thereafter due to interaction with the main belt of the Westerlies . Ken made landfall upon Shikoku early on September 25 , and moved onward into the Sea of Japan where it evolved into an extratropical cyclone . The fourth typhoon of the season to strike Japan , Ken brought winds as high as 114 knots ( 211 km / h ) and rainfall of 221 millimetres ( 8 @.@ 7 in ) within a six @-@ hour period to Shikoku . Resultant mudslides damaged thousands of homes , and five people died . 
