WTJP33 RJTD 060300 WARNING 060300. WARNING VALID 070300. TYPHOON WARNING. SEVERE TROPICAL STORM 1511 NANGKA (1511) 980 HPA AT 11.9N 159.3E MARSHALLS MOVING WESTNORTHWEST 15 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 120 MILES. FORECAST POSITION FOR 061500UTC AT 12.5N 157.7E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 070300UTC AT 13.7N 155.2E WITH 75 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=