WTJP31 RJTD 140900 WARNING 140900. WARNING VALID 150900. TYPHOON WARNING. TYPHOON 1822 MANGKHUT (1822) 905 HPA AT 17.2N 124.9E SEA EAST OF PHILIPPINES MOVING WESTNORTHWEST 14 KNOTS. POSITION GOOD. MAX WINDS 110 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 120 MILES. RADIUS OF OVER 30 KNOT WINDS 400 MILES SOUTHEAST SEMICIRCLE AND 300 MILES ELSEWHERE. FORECAST POSITION FOR 142100UTC AT 17.9N 121.7E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 925 HPA, MAX WINDS 100 KNOTS NEAR CENTER. FORECAST POSITION FOR 150900UTC AT 18.8N 119.0E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 945 HPA, MAX WINDS 85 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=