WWJP74 RJTD 030000 IMPORTANT WARNING FOR OTARU NAVTEX AREA 030000UTC ISSUED AT 030300UTC PRESSURE GRADIENT IS STEEP WARNING(NEAR GALE) SEA WEST OF HOKKAIDO, SEA OFF HIYAMA AND TSUGARU, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE, SEA OFF AKITA WARNING(ICING) SEA WEST OF SAKHALIN NXT WARNING WILL BE ISSUED BEFORE 030900UTC =