WTKO20 RKSL 081200 KMA TROPICAL CYCLONE ADVISORY NO. 23 NAME 1813 SHANSHAN ANALYSIS POSITION 081200UTC 34.4N 141.0E MOVEMENT NNW 7KT PRES/VMAX 975HPA 62KT FORECAST 24HR POSITION 091200UTC 38.3N 142.5E WITHIN 60NM PRES/VMAX 990HPA 47KT 48HR POSITION 101200UTC 41.8N 159.4E WITHIN 0NM PRES/VMAX 994HPA 41KT KOREA METEOROLOGICAL ADMINISTRATION.