WTJP32 RJTD 031500 WARNING 031500. WARNING VALID 041500. TYPHOON WARNING. SEVERE TROPICAL STORM 2411 YAGI (2411) 990 HPA AT 18.7N 118.1E SOUTH CHINA SEA ALMOST STATIONARY. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 041500UTC AT 18.9N 116.6E WITH 42 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=