WTJP31 RJTD 162100 WARNING 162100. WARNING VALID 172100. STORM WARNING. SEVERE TROPICAL STORM 1712 BANYAN (1712) 985 HPA AT 39.0N 171.8E SEA SOUTH OF ALEUTIANS MOVING NORTHEAST 31 KNOTS. POSITION FAIR. MAX WINDS 60 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 30 MILES. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 170900UTC AT 43.3N 177.8E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 992 HPA, MAX WINDS 45 KNOTS. BECOMING EXTRATROPICAL LOW. FORECAST POSITION FOR 172100UTC AT 46.0N 178.9W WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 40 KNOTS. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=