WTJP22 RJTD 030600 WARNING 030600. WARNING VALID 040600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 2411 YAGI (2411) UPGRADED FROM TROPICAL STORM 990 HPA AT 18.5N 118.6E SOUTH CHINA SEA MOVING WESTNORTHWEST 10 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 040600UTC AT 19.0N 117.5E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 60 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 050600UTC AT 18.8N 115.3E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 955 HPA, MAX WINDS 80 KNOTS NEAR CENTER. FORECAST POSITION FOR 060600UTC AT 19.5N 112.3E WITH 120 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 935 HPA, MAX WINDS 95 KNOTS NEAR CENTER. FORECAST POSITION FOR 070600UTC AT 21.0N 109.0E WITH 150 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 970 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 080600UTC AT 22.1N 105.6E WITH 180 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 35 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=