WTJP31 RJTD 280300 WARNING 280300. WARNING VALID 290300. STORM WARNING. TROPICAL STORM 1821 JEBI (1821) 1000 HPA AT 15.8N 156.6E SEA AROUND OF MINAMITORISIMA MOVING NORTHWEST 12 KNOTS. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES EAST SEMICIRCLE AND 60 MILES ELSEWHERE. FORECAST POSITION FOR 290300UTC AT 17.3N 153.0E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 50 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=