WTJP31 RJTD 310300 WARNING 310300. WARNING VALID 010300. TYPHOON WARNING. SEVERE TROPICAL STORM 1604 NIDA (1604) 985 HPA AT 17.7N 122.4E SEA EAST OF PHILIPPINES MOVING NORTHWEST 12 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES EAST SEMICIRCLE AND 120 MILES ELSEWHERE. FORECAST POSITION FOR 311500UTC AT 18.9N 120.5E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 010300UTC AT 20.0N 118.3E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=