WTJP32 RJTD 171500 WARNING 171500. WARNING VALID 181500. TYPHOON WARNING. SEVERE TROPICAL STORM 1721 LAN (1721) 980 HPA AT 10.7N 132.5E SEA EAST OF PHILIPPINES MOVING NORTHEAST SLOWLY. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 40 MILES. RADIUS OF OVER 30 KNOT WINDS 240 MILES SOUTH SEMICIRCLE AND 180 MILES ELSEWHERE. FORECAST POSITION FOR 180300UTC AT 12.6N 132.7E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 181500UTC AT 14.5N 132.1E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 70 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=