WWJP73 RJTD 170600 IMPORTANT WARNING FOR YOKOHAMA NAVTEX AREA 170600UTC ISSUED AT 170900UTC DEVELOPING LOW 1002HPA AT 32N 156E MOV NORTH SLWY LOW 1002HPA AT 27N 145E ALMOST STNR STNR FRONT FM 31N 109E TO 32N 114E 34N 117E 35N 124E 36N 128E 36N 132E WARNING(DENSE FOG) EASTERN SEA OFF SANRIKU, WESTERN SEA OFF SANRIKU, NORTHERN SEA OFF KANTO, SOUTHERN SEA OFF KANTO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 171500UTC =