WTJP21 RJTD 101200 WARNING 101200. WARNING VALID 111200. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. SEVERE TROPICAL STORM 2604 SINLAKU (2604) 980 HPA AT 08.0N 150.5E TRUKS MOVING WESTNORTHWEST SLOWLY. POSITION GOOD. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 40 MILES NORTHEAST SEMICIRCLE AND 20 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 270 MILES NORTHEAST SEMICIRCLE AND 210 MILES ELSEWHERE. FORECAST POSITION FOR 111200UTC AT 09.0N 150.3E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 121200UTC AT 10.5N 148.1E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 950 HPA, MAX WINDS 80 KNOTS NEAR CENTER. FORECAST POSITION FOR 131200UTC AT 12.3N 145.0E WITH 120 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 920 HPA, MAX WINDS 100 KNOTS NEAR CENTER. FORECAST POSITION FOR 141200UTC AT 14.2N 142.8E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 920 HPA, MAX WINDS 100 KNOTS NEAR CENTER. FORECAST POSITION FOR 151200UTC AT 15.9N 141.1E WITH 180 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 920 HPA, MAX WINDS 100 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=