WWJP74 RJTD 310000 IMPORTANT WARNING FOR OTARU NAVTEX AREA 310000UTC ISSUED AT 310300UTC DEVELOPING LOW 986HPA AT 53N 154E ALMOST STNR WARNING(NEAR GALE) SEA WEST OF SAKHALIN, SEA OFF HIYAMA AND TSUGARU, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE, SEA OFF AKITA, SEA OFF SADO WARNING(ICING) SEA WEST OF SAKHALIN NXT WARNING WILL BE ISSUED BEFORE 310900UTC =