WTJP33 RJTD 021500 WARNING 021500. WARNING VALID 031500. STORM WARNING. SEVERE TROPICAL STORM 2509 KROSA (2509) 975 HPA AT 38.5N 146.9E SEA EAST OF JAPAN MOVING EASTNORTHEAST 17 KNOTS. POSITION GOOD. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 210 MILES SOUTHEAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 030300UTC AT 39.9N 151.9E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 031500UTC AT 41.1N 157.9E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 45 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=