WTJP21 RJTD 011800 WARNING 011800. WARNING VALID 021800. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 1604 NIDA (1604) 970 HPA AT 22.5N 114.9E SOUTH CHINA SEA MOVING WESTNORTHWEST 13 KNOTS. POSITION GOOD. MAX WINDS 65 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 60 MILES. RADIUS OF OVER 30 KNOT WINDS 180 MILES EAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 020600UTC AT 23.6N 112.3E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 021800UTC AT 24.4N 110.0E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 35 KNOTS. EXTENDED OUTLOOK. FORECAST POSITION FOR 031800UTC AT 25.0N 107.1E WITH 110 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=