WTJP21 RJTD 010000 WARNING 010000. WARNING VALID 020000. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. SEVERE TROPICAL STORM 1604 NIDA (1604) 980 HPA AT 20.1N 118.9E BASHI CHANNEL MOVING WESTNORTHWEST 15 KNOTS. POSITION GOOD. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 210 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 011200UTC AT 21.3N 116.4E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 020000UTC AT 22.4N 113.8E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 030000UTC AT 23.8N 109.9E WITH 95 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 40 KNOTS NEAR CENTER. FORECAST POSITION FOR 040000UTC AT 24.9N 106.4E WITH 130 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=