WTJP21 RJTD 121800 WARNING 121800. WARNING VALID 131800. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 2604 SINLAKU (2604) 905 HPA AT 11.6N 149.5E MARIANAS MOVING NORTHWEST 09 KNOTS. POSITION GOOD. MAX WINDS 115 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 90 MILES. RADIUS OF OVER 30 KNOT WINDS 325 MILES NORTHEAST SEMICIRCLE AND 270 MILES ELSEWHERE. FORECAST POSITION FOR 131800UTC AT 13.9N 146.5E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 905 HPA, MAX WINDS 115 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 141800UTC AT 15.6N 144.9E WITH 55 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 915 HPA, MAX WINDS 105 KNOTS NEAR CENTER. FORECAST POSITION FOR 151800UTC AT 17.6N 143.8E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 925 HPA, MAX WINDS 95 KNOTS NEAR CENTER. FORECAST POSITION FOR 161800UTC AT 20.3N 143.9E WITH 100 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 945 HPA, MAX WINDS 85 KNOTS NEAR CENTER. FORECAST POSITION FOR 171800UTC AT 22.9N 145.2E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=