WTKO20 RKSL 091800 KMA TROPICAL CYCLONE ADVISORY NO. 28 NAME 1813 SHANSHAN ANALYSIS POSITION 091800UTC 38.8N 144.1E MOVEMENT NE 17KT PRES/VMAX 985HPA 52KT FORECAST 24HR POSITION 101800UTC 42.3N 157.1E WITHIN 0NM PRES/VMAX 990HPA 47KT KOREA METEOROLOGICAL ADMINISTRATION.