000 FKNT24 KNHC 251451 TCANT4 TROPICAL STORM ISAAC ICAO ADVISORY NUMBER 18 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012 1500 UTC SAT AUG 25 2012 TC ADVISORY DTG: 20120825/1500Z TCAC: KNHC TC: ISAAC NR: 018 PSN: N2006 W07436 MOV: NW 15KT C: 0998HPA MAX WIND: 050KT FCST PSN + 06 HR: 252100 N2110 W07548 FCST MAX WIND + 06 HR: 050KT FCST PSN + 12 HR: 260300 N2206 W07703 FCST MAX WIND + 12 HR: 050KT FCST PSN + 18 HR: 260900 N2254 W07821 FCST MAX WIND + 18 HR: 055KT FCST PSN + 24 HR: 261500 N2339 W07934 FCST MAX WIND + 24 HR: 060KT RMK THE FORECAST POSITION INFORMATION IN THIS PRODUCT IS INTERPOLATED FROM OFFICIAL FORECAST DATA VALID AT 0000... 0600...1200...AND 1800Z. NXT MSG: 20120825/2100Z ..