WTJP31 RJTD 281500 WARNING 281500. WARNING VALID 291500. TYPHOON WARNING. SEVERE TROPICAL STORM 1504 MAYSAK (1504) 985 HPA AT 07.4N 153.4E TRUKS MOVING WEST 07 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 291500UTC AT 07.9N 149.3E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=