WTJP32 RJTD 290900 WARNING 290900. WARNING VALID 300900. STORM WARNING. TROPICAL STORM 1618 CHABA (1618) 1000 HPA AT 14.4N 141.8E MARIANAS MOVING WEST 13 KNOTS. POSITION POOR. MAX WINDS 35 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 292100UTC AT 14.7N 139.8E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 40 KNOTS NEAR CENTER. FORECAST POSITION FOR 300900UTC AT 15.7N 137.9E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 50 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=