WTJP22 RJTD 031200 WARNING 031200. WARNING VALID 041200. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 1618 CHABA (1618) 905 HPA AT 25.8N 126.8E EAST CHINA SEA MOVING NORTHNORTHWEST 09 KNOTS. POSITION GOOD. MAX WINDS 115 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 040000UTC AT 28.2N 126.2E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 925 HPA, MAX WINDS 100 KNOTS NEAR CENTER. FORECAST POSITION FOR 041200UTC AT 31.2N 126.3E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 950 HPA, MAX WINDS 85 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 051200UTC AT 36.8N 134.7E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 061200UTC AT 39.9N 155.9E WITH 220 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=