WTJP31 RJTD 161500 WARNING 161500. WARNING VALID 171500. STORM WARNING. SEVERE TROPICAL STORM 1704 TALAS (1704) 990 HPA AT 18.3N 106.6E GULF OF TONGKING MOVING WEST 12 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 180 MILES. FORECAST POSITION FOR 170300UTC AT 18.9N 103.4E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 35 KNOTS NEAR CENTER. FORECAST POSITION FOR 171500UTC AT 19.7N 100.4E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1000 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=