WTJP31 RJTD 230300 WARNING 230300. WARNING VALID 240300. TYPHOON WARNING. SEVERE TROPICAL STORM 1610 LIONROCK (1610) 985 HPA AT 27.8N 134.2E SEA SOUTH OF JAPAN MOVING SOUTHSOUTHWEST SLOWLY. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 120 MILES SOUTHEAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 240300UTC AT 26.9N 134.0E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=