WTJP31 RJTD 312100 WARNING 312100. WARNING VALID 012100. TYPHOON WARNING. SEVERE TROPICAL STORM 1604 NIDA (1604) 980 HPA AT 20.0N 119.4E BASHI CHANNEL MOVING WESTNORTHWEST 15 KNOTS. POSITION GOOD. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 210 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 010900UTC AT 21.0N 117.0E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 012100UTC AT 22.1N 114.4E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=