 Typhoon Maemi formed on September 4 from the monsoon trough in the western Pacific Ocean . It slowly intensified into a tropical storm while moving northwestward , and Maemi became a typhoon on September 8 . That day , it quickly intensified due to favorable conditions , developing a well @-@ defined eye and reaching peak maximum sustained winds of 195 km / h ( 120 mph ) . While near peak intensity , Maemi was decelerating and began turning to the north @-@ northeast . The eyewall soon after passed over the Japanese island of Miyako @-@ jima on September 10 , producing the fourth lowest pressure on record in Japan after a pressure of 912 mbar ( 26 @.@ 9 inHg ) was recorded . With warm waters , Maemi was able to maintain much of its intensity before it made landfall just west of Busan , South Korea on September 12 . On Jeju Island , Maemi produced a peak wind gust of 216 km / h ( 134 mph ) and a minimum pressure of 950 mbar ( 28 inHg ) , both setting records for the country , and making it the most powerful typhoon to strike South Korea since record @-@ keeping began in the country in 1904 . The typhoon became extratropical in the Sea of Japan the next day , although the remnants persisted for several more days , bringing strong winds to northern Japan . 
 Typhoon Maemi formed on September 4 from the monsoon trough in the western Pacific Ocean . It slowly intensified into a tropical storm while moving northwestward , and Maemi became a typhoon on September 8 . That day , it quickly<a href='been_done' title='1'><mark></mark></a> intensified due to favorable conditions , developing a well @-@ defined eye and reaching peak maximum sustained winds of 195 km / h ( 120 mph ) . While near peak intensity , Maemi was decelerating and began turning to the north @-@ northeast . The eyewall soon after passed over the Japanese island of Miyako @-@ jima on September 10 , producing the fourth lowest pressure on record in Japan after a pressure of 912 mbar ( 26 @.@ 9 inHg ) was recorded . With warm waters , Maemi was able to maintain much of its intensity before it made landfall just west of Busan , South Korea on September 12 . On Jeju Island , Maemi produced a peak wind gust of 216 km / h ( 134 mph ) and a minimum pressure of 950 mbar ( 28 inHg ) , both setting records for the country , and making it the most powerful typhoon to strike South Korea since record @-@ keeping began in the country in 1904 . The typhoon<a href='been_done' title='2'><mark></mark></a> became extratropical in the Sea of Japan the next day , although the remnants persisted for several more days , bringing strong winds to northern Japan . 
Typhoon Maemi formed on September 4 from da monsoon trough in tdawestern Pacific Ocean . It slowly intensified into a tropical storm while moving northwestward , and Maemi became a typhoon on September 8 . That day , it quickly been intensified due to favorable conditions , developing a well @-@ defined eye and reachin peak maximum sustained winds of 195 km / h ( 120 mph ) . While near peak intensity , Maemi was decelerating and began turnin to the north @-@ northeast . The eyewall soon after passed over thdaapanese island of Miyako @-@ jima on September 10 , producing the fourth lowest pressure on record in Japan after a pressure of 912 mbar ( 26 @.@ 9 inHg ) was recorded . wit warm waters , Maemi was able to maintain much of its intensity before it made landfall jus west of Busan , South Korea on September 12 . On Jeju Island , Maemi produced a peak wind gust of 216 km / h ( 134 mph ) and a minimum pressure of 950 mbar ( 28 inHg ) , both settin records for the country , and wit it the most powerful typhoon to strike South Korea since record @-@ keeping began in thedauntry in 1904 . The typhoon been became extratropical in the da of Japan the nda day , although the remnants persisted fir several more dayz , bringin strong winds to northern Japan .