WTJP21 RJTD 250600 WARNING 250600. WARNING VALID 260600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2508 CO-MAY (2508) 985 HPA AT 19.8N 120.9E BASHI CHANNEL MOVING NORTHNORTHEAST 15 KNOTS. POSITION GOOD. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 350 MILES SOUTHEAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 251800UTC AT 23.6N 124.0E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 260600UTC AT 26.3N 126.2E WITH 65 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 35 KNOTS. EXTENDED OUTLOOK. FORECAST POSITION FOR 270600UTC AT 26.8N 127.7E WITH 115 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=