WTJP21 RJTD 280000 WARNING 280000. WARNING VALID 290000. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 1504 MAYSAK (1504) 998 HPA AT 07.8N 155.2E TRUKS MOVING WESTNORTHWEST 09 KNOTS. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 120 MILES. FORECAST POSITION FOR 290000UTC AT 07.8N 151.3E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 50 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 300000UTC AT 08.4N 145.9E WITH 140 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 310000UTC AT 09.2N 140.3E WITH 210 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 955 HPA, MAX WINDS 75 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=