WTJP31 RJTD 010900 WARNING 010900. WARNING VALID 020900. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 915 HPA AT 20.7N 137.8E SEA SOUTH OF JAPAN MOVING NORTHWEST 11 KNOTS. POSITION GOOD. MAX WINDS 105 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 90 MILES. RADIUS OF OVER 30 KNOT WINDS 180 MILES NORTHEAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 012100UTC AT 22.3N 136.2E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 915 HPA, MAX WINDS 105 KNOTS NEAR CENTER. FORECAST POSITION FOR 020900UTC AT 24.0N 134.9E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 920 HPA, MAX WINDS 100 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=