WTJP31 RJTD 282100 WARNING 282100. WARNING VALID 292100. TYPHOON WARNING. SEVERE TROPICAL STORM 1821 JEBI (1821) 994 HPA AT 16.8N 154.1E SEA AROUND OF MINAMITORISIMA MOVING WEST 09 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 180 MILES EAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 290900UTC AT 17.2N 152.3E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 292100UTC AT 17.4N 150.1E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=