WTJP31 RJTD 150900 WARNING 150900. WARNING VALID 160900. STORM WARNING. TROPICAL STORM 1515 GONI (1515) 994 HPA AT 14.2N 146.1E MARIANAS MOVING NORTHWEST 06 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 152100UTC AT 14.8N 145.2E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 160900UTC AT 15.5N 144.1E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=