WTJP21 RJTD 030600 WARNING 030600. WARNING VALID 040600. WARNING IS UPDATED EVERY 6 HOURS. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 945 HPA AT 27.5N 132.6E SEA SOUTH OF JAPAN MOVING NORTHNORTHWEST 11 KNOTS. POSITION GOOD. MAX WINDS 85 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 120 MILES EAST SEMICIRCLE AND 70 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 240 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 031800UTC AT 30.2N 132.8E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 945 HPA, MAX WINDS 85 KNOTS NEAR CENTER. FORECAST POSITION FOR 040600UTC AT 34.9N 135.4E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 050600UTC AT 49.5N 138.7E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 976 HPA, MAX WINDS 50 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=