WTJP31 RJTD 031500 WARNING 031500. WARNING VALID 041500. TYPHOON WARNING. TYPHOON 1821 JEBI (1821) 945 HPA AT 29.4N 132.6E SEA SOUTH OF JAPAN MOVING NORTH 13 KNOTS. POSITION GOOD. MAX WINDS 85 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 90 MILES EAST SEMICIRCLE AND 60 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 240 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 040300UTC AT 33.4N 134.6E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 945 HPA, MAX WINDS 85 KNOTS NEAR CENTER. FORECAST POSITION FOR 041500UTC AT 40.7N 138.6E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=