WWJP75 RJTD 180600 IMPORTANT WARNING FOR KUSHIRO NAVTEX AREA 180600UTC ISSUED AT 180900UTC DEVELOPING LOW 1012HPA AT 36N 160E MOV EAST 20 KT LOW 1008HPA AT 45N 136E MOV ENE 15 KT WARNING(DENSE FOG) SEA EAST OF SAKHALIN, SEA OFF ABASHIRI, SOYA KAIKYO, SEA EAST OF HOKKAIDO, SEA OFF KUSHIRO, SEA OFF HIDAKA, TSUGARU KAIKYO, EASTERN SEA OFF SANRIKU, WESTERN SEA OFF SANRIKU POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 181500UTC =