WWJP83 RJTD 241200 VITAL WARNING FOR YOKOHAMA NAVTEX AREA 241200UTC ISSUED AT 241500UTC PRESSURE GRADIENT IS STEEP GALE WARNING SOUTHERN SEA OFF SHIKOKU WITH MAX WINDS 35 KT WARNING(NEAR GALE) NORTHERN SEA OFF SHIKOKU WARNING(DENSE FOG) EASTERN SEA OFF SANRIKU, WESTERN SEA OFF SANRIKU, NORTHERN SEA OFF KANTO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 242100UTC =