WTJP21 RJTD 161200 WARNING 161200. WARNING VALID 171200. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 2604 SINLAKU (2604) 950 HPA AT 18.4N 144.7E MARIANAS MOVING NORTHNORTHEAST 06 KNOTS. POSITION GOOD. MAX WINDS 80 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 120 MILES. RADIUS OF OVER 30 KNOT WINDS 300 MILES SOUTH SEMICIRCLE AND 270 MILES ELSEWHERE. FORECAST POSITION FOR 171200UTC AT 20.8N 146.0E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 181200UTC AT 24.5N 147.5E WITH 55 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 191200UTC AT 28.3N 153.1E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 201200UTC AT 29.8N 164.3E WITH 125 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=