WTJP31 RJTD 140900 WARNING 140900. WARNING VALID 150900. STORM WARNING. TROPICAL STORM 1607 CHANTHU (1607) 992 HPA AT 24.4N 144.1E OGASAWARA SHOTO MOVING NORTHNORTHEAST 20 KNOTS. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 180 MILES EAST SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 142100UTC AT 25.4N 144.7E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 150900UTC AT 26.7N 144.3E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=