WTJP31 RJTD 152100 WARNING 152100. WARNING VALID 162100. TYPHOON WARNING. SEVERE TROPICAL STORM 1515 GONI (1515) 985 HPA AT 14.6N 144.9E MARIANAS MOVING WESTNORTHWEST 06 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 160900UTC AT 15.2N 143.6E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 162100UTC AT 16.0N 142.2E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=