WWJP74 RJTD 100600 IMPORTANT WARNING FOR OTARU NAVTEX AREA 100600UTC ISSUED AT 100900UTC DEVELOPED LOW 986HPA AT 47N 154E MOV NE 15 KT DEVELOPING LOW 1002HPA AT 32N 141E MOV ENE 35 KT WARNING(DENSE FOG) SEA WEST OF SAKHALIN, SOYA KAIKYO, SEA WEST OF HOKKAIDO, SEA OFF HIYAMA AND TSUGARU, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE, SEA OFF AKITA, SEA OFF SADO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 101500UTC =