WTJP32 RJTD 302100 WARNING 302100. WARNING VALID 012100. TYPHOON WARNING. SEVERE TROPICAL STORM 1618 CHABA (1618) 985 HPA AT 15.8N 135.7E SEA EAST OF PHILIPPINES MOVING NORTHWEST 10 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 010900UTC AT 17.8N 133.9E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 012100UTC AT 19.7N 131.6E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=