 Developing in the Philippine Sea on July 30 , the system developed as it moved westward , becoming a tropical storm on July 31 . On August 1 , its mid @-@ level circulation center crossed into the South China sea while its surface circulation was left behind east of the Philippines . Sarah 's broad circulation center was difficult to locate until it began moving northeast east of Luzon on August 2 , when it intensified to its peak intensity . As Sarah moved east of Honshu , it evolved into an extratropical cyclone . Fourteen died in Japan due to Sarah . 
