tokyo typhoon lan heavy rain destructive wind expect hit southern japan sunday nation hold national election force officials okinawa stage vote day early remote islands category typhoon locate east philippines friday morning move north expect gain strength come 200 km 125 miles east japan southern island okinawa sunday japan meteorological agency say likely rain heavily nansei island chain southern japan pacific side western eastern japan 21st 23rd chance rain violently regions agency say statement accord tropical storm risk web site typhoon likely strengthen category weaken time brush past tokyo monday local authorities okinawa decide move vote date saturday remote islands tomoaki iwai political science professor nihon university say adverse weather likely hurt stand new party lead popular tokyo governor yuriko koike party hope voters party affiliation tend go vote bad weather party dependent general mood voters give time like party hope set suffer iwai say say supporters prime minister shinzo abe liberal democratic party ldp may opt brave weather vote well believe base recent media poll rule party get election bag ldp-led coalition track roughly match two-thirds super majority hold parliament low house dissolution help divisions opposition camp jitters north korea nuclear missile program media forecast say typhoon bear japan hind vote national election