WTJP33 RJTD 010900 WARNING 010900. WARNING VALID 020900. STORM WARNING. SEVERE TROPICAL STORM 2509 KROSA (2509) 975 HPA AT 34.1N 141.5E SEA EAST OF JAPAN MOVING NORTH 10 KNOTS. POSITION GOOD. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 012100UTC AT 35.7N 142.1E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 020900UTC AT 37.2N 144.7E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 55 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=