WTJP21 RJTD 030000 WARNING 030000. WARNING VALID 040000. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2606 JANGMI (2606) 980 HPA AT 34.3N 137.5E SEA SOUTH OF JAPAN MOVING EASTNORTHEAST 22 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS. RADIUS OF OVER 30 KNOT WINDS 300 MILES SOUTHEAST SEMICIRCLE AND 240 MILES ELSEWHERE. FORECAST POSITION FOR 031200UTC AT 36.2N 143.3E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS. FORECAST POSITION FOR 040000UTC AT 36.3N 145.7E WITH 42 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=