WTJP21 RJTD 281800 WARNING 281800. WARNING VALID 291800. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2520 BUALOI (2520) DOWNGRADED FROM TYPHOON 980 HPA AT 18.0N 106.0E VIETNAM MOVING WESTNORTHWEST 12 KNOTS. POSITION GOOD. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 40 MILES. RADIUS OF OVER 30 KNOT WINDS 240 MILES NORTHEAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 290600UTC AT 19.9N 103.5E WITH 35 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 35 KNOTS. FORECAST POSITION FOR 291800UTC AT 20.8N 101.1E WITH 57 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1004 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=