WTJP31 RJTD 270300 WARNING 270300. WARNING VALID 280300. STORM WARNING. SEVERE TROPICAL STORM 0920 LUPIT (0920) 965 HPA AT 40.8N 147.5E SEA EAST OF JAPAN MOVING NORTHNORTHEAST 55 KNOTS. POSITION FAIR. MAX WINDS 60 KNOTS. RADIUS OF OVER 50 KNOT WINDS 240 MILES EAST SEMICIRCLE AND 150 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 600 MILES EAST SEMICIRCLE AND 240 MILES ELSEWHERE. FORECAST POSITION FOR 271500UTC AT 45.5N 153.7E WITH 85 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 952 HPA, MAX WINDS 70 KNOTS. BECOMING EXTRATROPICAL LOW. FORECAST POSITION FOR 280300UTC AT 48.9N 161.7E WITH 130 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 950 HPA, MAX WINDS 65 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=