WTJP31 RJTD 300300 WARNING 300300. WARNING VALID 310300. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 960 HPA AT 17.5N 148.7E MARIANAS MOVING WEST 11 KNOTS. POSITION GOOD. MAX WINDS 80 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 60 MILES. RADIUS OF OVER 30 KNOT WINDS 180 MILES EAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 301500UTC AT 17.6N 146.4E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 950 HPA, MAX WINDS 90 KNOTS NEAR CENTER. FORECAST POSITION FOR 310300UTC AT 18.1N 144.1E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 940 HPA, MAX WINDS 95 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=