WTKO20 RKSL 270000 KMA TROPICAL CYCLONE ADVISORY NO. 4 NAME 1603 MIRINAE ANALYSIS POSITION 270000UTC 19.7N 108.5E MOVEMENT WNW 15KT PRES/VMAX 998HPA 37KT FORECAST 24HR POSITION 280000UTC 21.3N 106.0E WITHIN 75NM PRES/VMAX 998HPA 37KT 48HR POSITION 290000UTC 24.6N 103.2E WITHIN 0NM PRES 1004HPA KOREA METEOROLOGICAL ADMINISTRATION.