WTJP21 RJTD 230600 WARNING 230600. WARNING VALID 240600. WARNING IS UPDATED EVERY 6 HOURS. GALE WARNING. TROPICAL STORM 2404 PRAPIROON (2404) 994 HPA AT 21.6N 107.3E VIETNAM MOVING NORTHNORTHWEST SLOWLY. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 231800UTC AT 21.6N 106.7E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA. BECOMING TROPICAL DEPRESSION. FORECAST POSITION FOR 240600UTC AT 21.8N 106.3E WITH 57 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=