WTKO20 RKSL 310600 KMA TROPICAL CYCLONE ADVISORY NO. 4 NAME 1604 NIDA ANALYSIS POSITION 310600UTC 18.0N 122.0E MOVEMENT WNW 12KT PRES/VMAX 980HPA 56KT FORECAST 24HR POSITION 010600UTC 20.4N 118.1E WITHIN 75NM PRES/VMAX 965HPA 72KT 48HR POSITION 020600UTC 22.6N 113.1E WITHIN 125NM PRES/VMAX 960HPA 76KT 72HR POSITION 030600UTC 24.2N 108.2E WITHIN 175NM PRES/VMAX 996HPA 39KT 96HR POSITION 040600UTC 24.9N 104.1E WITHIN 0NM PRES 1004HPA KOREA METEOROLOGICAL ADMINISTRATION.