 The season began with the formation of Tropical Storm <unk> on January 15 . After its <unk> five days later , no tropical cyclones of at least tropical storm intensity developed over the next two months . This period of inactivity ended with the formation of Typhoon <unk> in mid @-@ April ; <unk> was one of the longest lived Pacific storms on record and was the first typhoon with 1 @-@ minute sustained winds of at least 240 km / h ( 150 mph ) in April since Typhoon Isa in 1997 . Tropical activity was enhanced from May to June , and during this period the JMA monitored four tropical storms , while the PAGASA monitored a fifth storm off the eastern Philippines . Three of the four tropical storms monitored by the JMA approached or hit Japan , including Typhoon <unk> , which brought heavy rainfall and wind across the <unk> Islands and the Korean Peninsula . 
