WTJP32 RJTD 090300 WARNING 090300. WARNING VALID 100300. STORM WARNING. SEVERE TROPICAL STORM 1813 SHANSHAN (1813) DOWNGRADED FROM TYPHOON 980 HPA AT 36.8N 141.2E SEA EAST OF JAPAN MOVING NORTH 10 KNOTS. POSITION GOOD. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 40 MILES EAST SEMICIRCLE AND 10 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 240 MILES EAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 091500UTC AT 38.5N 143.0E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 100300UTC AT 40.4N 148.4E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=