WTJP31 RJTD 310300 WARNING 310300. WARNING VALID 010300. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 915 HPA AT 18.1N 143.5E MARIANAS MOVING WEST 12 KNOTS. POSITION GOOD. MAX WINDS 105 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 60 MILES. RADIUS OF OVER 30 KNOT WINDS 180 MILES NORTH SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 311500UTC AT 18.8N 141.2E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 905 HPA, MAX WINDS 110 KNOTS NEAR CENTER. FORECAST POSITION FOR 010300UTC AT 19.9N 139.1E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 905 HPA, MAX WINDS 110 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=