WTJP31 RJTD 040900 WARNING 040900. WARNING VALID 050900. STORM WARNING. SEVERE TROPICAL STORM 1703 NANMADOL (1703) 992 HPA AT 34.1N 136.5E SEA SOUTH OF JAPAN MOVING EASTNORTHEAST 36 KNOTS. POSITION GOOD. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES SOUTHEAST SEMICIRCLE AND 60 MILES ELSEWHERE. FORECAST POSITION FOR 042100UTC AT 35.7N 144.0E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 050900UTC AT 37.3N 151.6E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 45 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=