WTJP21 RJTD 140600 WARNING 140600. WARNING VALID 150600. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. TROPICAL STORM 1607 CHANTHU (1607) 994 HPA AT 23.3N 143.8E 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 141800UTC AT 24.6N 144.6E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 150600UTC AT 26.2N 144.3E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 980 HPA, MAX WINDS 55 KNOTS NEAR CENTER. EXTENDED OUTLOOK. FORECAST POSITION FOR 160600UTC AT 29.1N 142.0E WITH 95 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. FORECAST POSITION FOR 170600UTC AT 32.9N 140.5E WITH 130 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 975 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=