WTJP31 RJTD 160300 WARNING 160300. WARNING VALID 170300. TYPHOON WARNING. SEVERE TROPICAL STORM 1515 GONI (1515) 980 HPA AT 14.9N 144.4E MARIANAS MOVING WESTNORTHWEST 06 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 161500UTC AT 15.6N 143.0E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 170300UTC AT 16.5N 141.2E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=