WTJP31 RJTD 150300 WARNING 150300. WARNING VALID 160300. STORM WARNING. TROPICAL STORM 1515 GONI (1515) 994 HPA AT 13.8N 146.6E MARIANAS MOVING NORTHWEST 10 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 151500UTC AT 14.5N 145.7E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 160300UTC AT 15.2N 144.8E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=