WWJP81 RJTD 051800 VITAL WARNING FOR NAHA NAVTEX AREA 051800UTC ISSUED AT 052100UTC PRESSURE GRADIENT IS STEEP GALE WARNING SEA SOUTH OF OKINAWA WITH MAX WINDS 35 KT WARNING(NEAR GALE) NORTHERN SEA OFF SHIKOKU, SOUTHERN SEA OFF SHIKOKU, SEA WEST OF NAGASAKI, SEA SOUTHWEST OF MESHIMA, SEA OFF KAGOSHIMA, SEA AROUND AMAMI, SOUTHERN PART OF EAST CHINA SEA NXT WARNING WILL BE ISSUED BEFORE 060300UTC =