WTJP31 RJTD 231500 WARNING 231500. WARNING VALID 241500. TYPHOON WARNING. SEVERE TROPICAL STORM 1610 LIONROCK (1610) 975 HPA AT 26.4N 133.8E SEA SOUTH OF JAPAN MOVING SOUTHSOUTHWEST SLOWLY. POSITION FAIR. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 120 MILES. FORECAST POSITION FOR 241500UTC AT 25.8N 133.4E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 960 HPA, MAX WINDS 75 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=