WTKO20 RKSL 160000 KMA TROPICAL CYCLONE ADVISORY NO. 4 NAME 1818 RUMBIA ANALYSIS POSITION 160000UTC 29.9N 124.7E MOVEMENT NNW 3KT PRES/VMAX 996HPA 35KT FORECAST 24HR POSITION 170000UTC 30.8N 119.4E WITHIN 60NM PRES/VMAX 996HPA 35KT 48HR POSITION 180000UTC 31.8N 114.4E WITHIN 0NM PRES/VMAX 1000HPA 25KT KOREA METEOROLOGICAL ADMINISTRATION.