WTJP31 RJTD 280900 WARNING 280900. WARNING VALID 290900. STORM WARNING. TROPICAL STORM 1504 MAYSAK (1504) 994 HPA AT 07.3N 154.3E TRUKS MOVING WESTSOUTHWEST SLOWLY. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 290900UTC AT 07.7N 149.8E WITH 75 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=