WWJP74 RJTD 101800 IMPORTANT WARNING FOR OTARU NAVTEX AREA 101800UTC ISSUED AT 102100UTC DEVELOPING LOW 1000HPA AT 39N 149E MOV NNE 10 KT FCST POSITION FOR 111800UTC AT 40N 151E WITH UNCERTANITY OF 80 MILES RADIUS WARNING(DENSE FOG) SOYA KAIKYO, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 110300UTC =