WTJP22 RJTD 140600 WARNING 140600. WARNING VALID 150600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 1815 LEEPI (1815) 994 HPA AT 30.4N 134.6E SEA SOUTH OF JAPAN MOVING NORTHWEST 15 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES EAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 141800UTC AT 32.5N 131.1E WITH 70 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 45 KNOTS NEAR CENTER. FORECAST POSITION FOR 150600UTC AT 33.9N 127.9E WITH 90 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA, MAX WINDS 40 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 160600UTC AT 33.4N 124.7E WITH 100 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1002 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=