WTJP22 RJTD 030600 WARNING 030600. WARNING VALID 040600. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 1618 CHABA (1618) 915 HPA AT 24.9N 127.0E SEA SOUTH OF OKINAWA MOVING NORTHNORTHWEST 12 KNOTS. POSITION GOOD. MAX WINDS 110 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES NORTHEAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 031800UTC AT 27.0N 126.6E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 925 HPA, MAX WINDS 100 KNOTS NEAR CENTER. FORECAST POSITION FOR 040600UTC AT 29.6N 126.1E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 935 HPA, MAX WINDS 95 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 050600UTC AT 35.7N 131.2E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 060600UTC AT 40.1N 152.2E WITH 220 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 40 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=