WTKO20 RKSL 121800 KMA TROPICAL CYCLONE ADVISORY NO. 7 NAME 1702 MERBOK ANALYSIS POSITION 121800UTC 22.8N 114.6E MOVEMENT NNE 10KT PRES/VMAX 996HPA 39KT FORECAST 24HR POSITION 131800UTC 26.4N 116.7E WITHIN 0NM PRES 1004HPA KOREA METEOROLOGICAL ADMINISTRATION.