WTKO20 RKSL 151200 KMA TROPICAL CYCLONE ADVISORY NO. 8 NAME 1607 CHANTHU ANALYSIS POSITION 151200UTC 29.2N 144.1E MOVEMENT NNW 13KT PRES/VMAX 985HPA 52KT FORECAST 12HR POSITION 160000UTC 31.0N 142.2E WITHIN 30NM PRES/VMAX 985HPA 52KT 24HR POSITION 161200UTC 33.4N 141.1E WITHIN 75NM PRES/VMAX 985HPA 52KT 36HR POSITION 170000UTC 36.7N 141.2E WITHIN 100NM PRES/VMAX 985HPA 52KT 48HR POSITION 171200UTC 41.7N 142.6E WITHIN 125NM PRES/VMAX 990HPA 47KT 60HR POSITION 180000UTC 48.4N 145.0E WITHIN 0NM PRES 994HPA KOREA METEOROLOGICAL ADMINISTRATION.