WTJP32 RJTD 290300 WARNING 290300. WARNING VALID 300300. STORM WARNING. TROPICAL STORM 1618 CHABA (1618) 1000 HPA AT 14.7N 143.3E MARIANAS MOVING WEST 09 KNOTS. POSITION FAIR. MAX WINDS 35 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 120 MILES. FORECAST POSITION FOR 291500UTC AT 14.9N 141.2E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 300300UTC AT 15.2N 139.1E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 50 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=