WTJP21 RJTD 040600 WARNING 040600. WARNING VALID 050600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 2503 MUN (2503) 996 HPA AT 30.1N 145.3E SEA EAST OF JAPAN MOVING NORTHNORTHEAST 06 KNOTS. POSITION GOOD. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES NORTHEAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 050600UTC AT 31.3N 147.6E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 50 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 060600UTC AT 32.8N 150.0E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 070600UTC AT 35.6N 148.9E WITH 120 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 080600UTC AT 39.8N 149.4E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1000 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=