WTJP22 RJTD 041200 WARNING 041200. WARNING VALID 051200. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 1618 CHABA (1618) 940 HPA AT 31.1N 125.9E EAST CHINA SEA MOVING NORTH 17 KNOTS. POSITION FAIR. MAX WINDS 90 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 210 MILES EAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 050000UTC AT 34.2N 127.5E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 80 KNOTS NEAR CENTER. FORECAST POSITION FOR 051200UTC AT 37.2N 134.5E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 061200UTC AT 42.0N 156.0E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=