WTJP31 RJTD 031500 WARNING 031500. WARNING VALID 041500. TYPHOON WARNING. TYPHOON 1612 NAMTHEUN (1612) 965 HPA AT 30.7N 129.9E EAST CHINA SEA MOVING NORTH 06 KNOTS. POSITION GOOD. MAX WINDS 65 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 20 MILES. RADIUS OF OVER 30 KNOT WINDS 90 MILES NORTHEAST SEMICIRCLE AND 60 MILES ELSEWHERE. FORECAST POSITION FOR 040300UTC AT 31.5N 129.6E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 65 KNOTS NEAR CENTER. FORECAST POSITION FOR 041500UTC AT 32.5N 129.5E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 965 HPA, MAX WINDS 65 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=