000 FKNT24 KNHC 260852 TCANT4 TROPICAL STORM ISAAC ICAO ADVISORY NUMBER 21 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012 0900 UTC SUN AUG 26 2012 TC ADVISORY DTG: 20120826/0900Z TCAC: KNHC TC: ISAAC NR: 021 PSN: N2306 W07900 MOV: NW 16KT C: 0995HPA MAX WIND: 055KT FCST PSN + 06 HR: 261500 N2350 W08012 FCST MAX WIND + 06 HR: 060KT FCST PSN + 12 HR: 262100 N2431 W08122 FCST MAX WIND + 12 HR: 060KT FCST PSN + 18 HR: 270300 N2510 W08231 FCST MAX WIND + 18 HR: 065KT FCST PSN + 24 HR: 270900 N2551 W08333 FCST MAX WIND + 24 HR: 065KT RMK THE FORECAST POSITION INFORMATION IN THIS PRODUCT IS INTERPOLATED FROM OFFICIAL FORECAST DATA VALID AT 0000... 0600...1200...AND 1800Z. NXT MSG: 20120826/1500Z ..