WTKO20 RKSL 190000 KMA TROPICAL CYCLONE ADVISORY NO. 23 NAME 1621 SARIKA ANALYSIS POSITION 190000UTC 20.7N 107.6E MOVEMENT WNW 6KT PRES/VMAX 990HPA 47KT FORECAST 24HR POSITION 200000UTC 23.5N 107.9E WITHIN 0NM PRES 1002HPA KOREA METEOROLOGICAL ADMINISTRATION.