WTJP31 RJTD 010300 WARNING 010300. WARNING VALID 020300. TYPHOON WARNING. SEVERE TROPICAL STORM 1604 NIDA (1604) 980 HPA AT 20.7N 118.1E SOUTH CHINA SEA MOVING WESTNORTHWEST 15 KNOTS. POSITION GOOD. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 60 MILES. RADIUS OF OVER 30 KNOT WINDS 210 MILES EAST SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 011500UTC AT 21.8N 115.5E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 020300UTC AT 22.7N 113.0E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=