WTJP21 RJTD 141800 WARNING 141800. WARNING VALID 151800. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 2604 SINLAKU (2604) 925 HPA AT 15.2N 145.4E MARIANAS MOVING NORTHNORTHWEST SLOWLY. POSITION GOOD. MAX WINDS 100 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 110 MILES. RADIUS OF OVER 30 KNOT WINDS 325 MILES NORTH SEMICIRCLE AND 270 MILES ELSEWHERE. FORECAST POSITION FOR 151800UTC AT 16.8N 144.6E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 940 HPA, MAX WINDS 90 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 161800UTC AT 19.4N 145.0E WITH 55 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 955 HPA, MAX WINDS 80 KNOTS NEAR CENTER. FORECAST POSITION FOR 171800UTC AT 21.9N 146.7E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. FORECAST POSITION FOR 181800UTC AT 25.7N 149.1E WITH 100 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 191800UTC AT 29.3N 156.7E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=