WTJP31 RJTD 032100 WARNING 032100. WARNING VALID 042100. STORM WARNING. TROPICAL STORM 1601 NEPARTAK (1601) 996 HPA AT 11.1N 143.8E MARIANAS MOVING NORTHNORTHWEST 08 KNOTS. POSITION FAIR. MAX WINDS 40 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 042100UTC AT 15.3N 137.8E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 55 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=