WTKO20 RKSL 031800 KMA TROPICAL CYCLONE ADVISORY NO. 28 NAME 1821 JEBI ANALYSIS POSITION 031800UTC 30.2N 132.9E MOVEMENT N 16KT PRES/VMAX 955HPA 78KT FORECAST 24HR POSITION 041800UTC 41.7N 138.3E WITHIN 60NM PRES/VMAX 970HPA 68KT 48HR POSITION 051800UTC 53.6N 139.1E WITHIN 0NM PRES/VMAX 985HPA 52KT KOREA METEOROLOGICAL ADMINISTRATION.