WTJP31 RJTD 092100 WARNING 092100. WARNING VALID 102100. TYPHOON WARNING. SEVERE TROPICAL STORM 1620 SONGDA (1620) 985 HPA AT 24.3N 146.9E OGASAWARA SHOTO MOVING NORTHWEST 12 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 100900UTC AT 25.5N 145.9E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 102100UTC AT 26.8N 146.0E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=