WWJP81 RJTD 230600 VITAL WARNING FOR NAHA NAVTEX AREA 230600UTC ISSUED AT 230900UTC PRESSURE GRADIENT IS STEEP GALE WARNING SEA SOUTH OF OKINAWA WITH MAX WINDS 35 KT WARNING(NEAR GALE) NORTHERN SEA OFF SHIKOKU NXT WARNING WILL BE ISSUED BEFORE 231500UTC =