WTJP23 RJTD 221800 WARNING 221800. WARNING VALID 231800. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 1609 MINDULLE (1609) 992 HPA AT 40.7N 141.8E SEA EAST OF JAPAN MOVING NORTH 28 KNOTS. POSITION GOOD. MAX WINDS 50 KNOTS. RADIUS OF OVER 30 KNOT WINDS 130 MILES SOUTHEAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 230600UTC AT 47.4N 145.7E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. FORECAST POSITION FOR 231800UTC AT 55.8N 148.1E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 45 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=