WTJP32 RJTD 242100 WARNING 242100. WARNING VALID 252100. STORM WARNING. SEVERE TROPICAL STORM 1516 ATSANI (1516) 970 HPA AT 34.0N 153.9E SEA EAST OF JAPAN MOVING EASTNORTHEAST 18 KNOTS. POSITION GOOD. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 100 MILES SOUTHEAST SEMICIRCLE AND 70 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 325 MILES SOUTHEAST SEMICIRCLE AND 300 MILES ELSEWHERE. FORECAST POSITION FOR 250900UTC AT 36.8N 158.4E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 252100UTC AT 38.5N 161.4E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 45 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=