WTJP31 RJTD 160900 WARNING 160900. WARNING VALID 170900. TYPHOON WARNING. SEVERE TROPICAL STORM 1515 GONI (1515) 980 HPA AT 15.3N 143.8E MARIANAS MOVING WESTNORTHWEST 07 KNOTS. POSITION GOOD. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 162100UTC AT 16.4N 142.0E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 170900UTC AT 17.4N 139.7E WITH 75 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=