WTJP22 RJTD 240000 WARNING 240000. WARNING VALID 250000. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 1820 CIMARON (1820) 990 HPA AT 39.1N 136.2E SEA OF JAPAN MOVING NORTHNORTHEAST 28 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS. RADIUS OF OVER 30 KNOT WINDS 300 MILES SOUTHEAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 241200UTC AT 42.0N 139.8E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA. BECOMING EXTRATROPICAL LOW. FORECAST POSITION FOR 250000UTC AT 42.2N 146.5E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=