WWJP74 RJTD 210600 IMPORTANT WARNING FOR OTARU NAVTEX AREA 210600UTC ISSUED AT 210900UTC PRESSURE GRADIENT IS STEEP WARNING(NEAR GALE) SEA WEST OF SAKHALIN, SEA OFF HIYAMA AND TSUGARU, SEA OFF AKITA, SEA OFF SADO, SEA OFF NOTO WARNING(ICING) SEA WEST OF SAKHALIN NXT WARNING WILL BE ISSUED BEFORE 211500UTC =