WTKO20 RKSL 171200 KMA TROPICAL CYCLONE ADVISORY NO. 10 NAME 1818 RUMBIA ANALYSIS POSITION 171200UTC 31.7N 117.4E MOVEMENT W 11KT PRES/VMAX 990HPA 35KT FORECAST 24HR POSITION 181200UTC 33.3N 113.7E WITHIN 0NM PRES/VMAX 996HPA 23KT KOREA METEOROLOGICAL ADMINISTRATION.