WTJP21 RJTD 231800 WARNING 231800. WARNING VALID 241800. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 2508 CO-MAY (2508) 994 HPA AT 16.9N 117.7E SOUTH CHINA SEA MOVING SOUTHWEST 13 KNOTS. POSITION FAIR. MAX WINDS 35 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 240600UTC AT 16.5N 119.0E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 241800UTC AT 17.4N 120.4E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 35 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 251800UTC AT 23.1N 125.7E WITH 100 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=