WTJP21 RJTD 280600 WARNING 280600. WARNING VALID 290600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 1504 MAYSAK (1504) 994 HPA AT 07.3N 154.6E TRUKS MOVING WEST 08 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 290600UTC AT 07.8N 149.9E WITH 75 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 55 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 300600UTC AT 08.7N 144.4E WITH 140 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 310600UTC AT 09.5N 138.9E WITH 210 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 955 HPA, MAX WINDS 80 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=