WWJP74 RJTD 150600 IMPORTANT WARNING FOR OTARU NAVTEX AREA 150600UTC ISSUED AT 150900UTC DEVELOPING LOW 998HPA AT 40N 144E MOV ENE 15 KT C-FRONT FM 40N 144E TO 37N 140E 35N 135E WARNING(DENSE FOG) SEA WEST OF SAKHALIN, SOYA KAIKYO, SEA WEST OF HOKKAIDO, TSUGARU KAIKYO, SEA OFF HIYAMA AND TSUGARU, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE, SEA OFF AKITA, SEA OFF SADO, SEA OFF NOTO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 151500UTC =