WTJP31 RJTD 030900 WARNING 030900. WARNING VALID 040900. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 945 HPA AT 28.0N 132.5E SEA SOUTH OF JAPAN MOVING NORTH 11 KNOTS. POSITION GOOD. MAX WINDS 85 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 120 MILES EAST SEMICIRCLE AND 90 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 240 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 032100UTC AT 31.1N 133.2E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 945 HPA, MAX WINDS 85 KNOTS NEAR CENTER. FORECAST POSITION FOR 040900UTC AT 36.9N 136.6E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=