WTJP33 RJTD 060900 WARNING 060900. WARNING VALID 070900. TYPHOON WARNING. SEVERE TROPICAL STORM 1511 NANGKA (1511) 975 HPA AT 11.9N 158.3E MARSHALLS MOVING WEST 14 KNOTS. POSITION GOOD. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES EAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 062100UTC AT 12.8N 155.8E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. FORECAST POSITION FOR 070900UTC AT 13.8N 153.8E WITH 75 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=