WTJP33 RJTD 221500 WARNING 221500. WARNING VALID 231500. STORM WARNING. SEVERE TROPICAL STORM 1609 MINDULLE (1609) 990 HPA AT 38.9N 141.1E NORTHERN JAPAN MOVING NORTH 21 KNOTS. POSITION GOOD. MAX WINDS 55 KNOTS. RADIUS OF OVER 50 KNOT WINDS 55 MILES. RADIUS OF OVER 30 KNOT WINDS 130 MILES SOUTHEAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 230300UTC AT 45.2N 144.8E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 50 KNOTS. FORECAST POSITION FOR 231500UTC AT 53.8N 147.9E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=