WTJP31 RJTD 280300 WARNING 280300. WARNING VALID 290300. STORM WARNING. TROPICAL STORM 1504 MAYSAK (1504) 998 HPA AT 07.5N 154.8E TRUKS MOVING WEST 08 KNOTS. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 120 MILES. FORECAST POSITION FOR 290300UTC AT 07.8N 150.6E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 50 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=