WTJP21 RJTD 011200 WARNING 011200. WARNING VALID 021200. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2606 JANGMI (2606) 975 HPA AT 26.8N 127.5E EAST CHINA SEA MOVING NORTH 12 KNOTS. POSITION FAIR. MAX WINDS 60 KNOTS. RADIUS OF OVER 50 KNOT WINDS 100 MILES EAST SEMICIRCLE AND 80 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 270 MILES EAST SEMICIRCLE AND 210 MILES ELSEWHERE. FORECAST POSITION FOR 020000UTC AT 29.2N 129.3E WITH 25 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS. FORECAST POSITION FOR 021200UTC AT 31.8N 132.8E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS. EXTENDED OUTLOOK. FORECAST POSITION FOR 031200UTC AT 36.3N 142.7E WITH 55 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 55 KNOTS. FORECAST POSITION FOR 041200UTC AT 36.6N 147.2E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 984 HPA, MAX WINDS 45 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=