WTKO20 RKSL 160000 KMA TROPICAL CYCLONE ADVISORY NO. 10 NAME 1607 CHANTHU ANALYSIS POSITION 160000UTC 31.5N 142.1E MOVEMENT NNW 15KT PRES/VMAX 990HPA 47KT FORECAST 12HR POSITION 161200UTC 33.7N 141.3E WITHIN 30NM PRES/VMAX 990HPA 47KT 24HR POSITION 170000UTC 37.2N 141.4E WITHIN 75NM PRES/VMAX 992HPA 45KT 36HR POSITION 171200UTC 42.1N 142.8E WITHIN 0NM PRES 996HPA KOREA METEOROLOGICAL ADMINISTRATION.