WTKO20 RKSL 150600 KMA TROPICAL CYCLONE ADVISORY NO. 7 NAME 1607 CHANTHU ANALYSIS POSITION 150600UTC 27.9N 144.6E MOVEMENT NNW 11KT PRES/VMAX 985HPA 52KT FORECAST 24HR POSITION 160600UTC 31.8N 141.8E WITHIN 75NM PRES/VMAX 985HPA 52KT 48HR POSITION 170600UTC 38.3N 141.8E WITHIN 125NM PRES/VMAX 990HPA 47KT 72HR POSITION 180600UTC 50.7N 146.3E WITHIN 0NM PRES 994HPA KOREA METEOROLOGICAL ADMINISTRATION.