WTJP21 RJTD 201200 WARNING 201200. WARNING VALID 211200. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2506 WIPHA (2506) 980 HPA AT 21.8N 112.1E SOUTH CHINA MOVING WEST 13 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 300 MILES SOUTH SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 210000UTC AT 21.3N 110.0E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 211200UTC AT 20.8N 108.6E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 60 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 221200UTC AT 20.2N 106.1E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 231200UTC AT 20.0N 102.6E WITH 140 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=