WTJP32 RJTD 200300 WARNING 200300. WARNING VALID 210300. STORM WARNING. SEVERE TROPICAL STORM 1507 DOLPHIN (1507) 975 HPA AT 28.5N 145.2E OGASAWARA SHOTO MOVING EASTNORTHEAST 21 KNOTS. POSITION FAIR. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 80 MILES. RADIUS OF OVER 30 KNOT WINDS 180 MILES. FORECAST POSITION FOR 201500UTC AT 34.0N 150.7E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 210300UTC AT 41.0N 158.5E WITH 130 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=