WTJP31 RJTD 021500 WARNING 021500. WARNING VALID 031500. STORM WARNING. SEVERE TROPICAL STORM 2203 CHABA (2203) 985 HPA AT 22.3N 110.5E SOUTH CHINA MOVING NORTHNORTHWEST 07 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS. RADIUS OF OVER 30 KNOT WINDS 350 MILES SOUTHEAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 030300UTC AT 23.6N 110.2E WITH 25 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 35 KNOTS. FORECAST POSITION FOR 031500UTC AT 24.6N 110.4E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=