WWJP73 RJTD 130600 IMPORTANT WARNING FOR YOKOHAMA NAVTEX AREA 130600UTC ISSUED AT 130900UTC DEVELOPING LOW 998HPA AT 35N 154E MOV NE 25 KT 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 131500UTC =