WTJP22 RJTD 291800 WARNING 291800. WARNING VALID 301800. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 1618 CHABA (1618) 992 HPA AT 13.4N 139.2E SEA EAST OF PHILIPPINES MOVING WEST 13 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 100 MILES. FORECAST POSITION FOR 300600UTC AT 14.6N 137.6E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 301800UTC AT 15.9N 136.1E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 011800UTC AT 19.7N 132.5E WITH 110 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. FORECAST POSITION FOR 021800UTC AT 24.3N 129.4E WITH 140 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 940 HPA, MAX WINDS 90 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=