WTJP23 RJTD 230000 WARNING 230000. WARNING VALID 240000. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 1609 MINDULLE (1609) 992 HPA AT 43.6N 143.8E HOKKAIDO MOVING NORTHNORTHEAST 35 KNOTS. POSITION GOOD. MAX WINDS 50 KNOTS. RADIUS OF OVER 30 KNOT WINDS 130 MILES EAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 231200UTC AT 52.2N 147.6E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 45 KNOTS. BECOMING EXTRATROPICAL LOW. FORECAST POSITION FOR 240000UTC AT 58.0N 149.0E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 984 HPA, MAX WINDS 40 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=