WTJP31 RJTD 151500 WARNING 151500. WARNING VALID 161500. STORM WARNING. TROPICAL STORM 1515 GONI (1515) 994 HPA AT 14.3N 145.2E MARIANAS MOVING WESTNORTHWEST 07 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 160300UTC AT 14.8N 144.5E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 161500UTC AT 15.6N 143.4E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=