000 FKNT24 KNHC 251453 TCANT4 HURRICANE HARVEY ICAO ADVISORY NUMBER 21 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092017 1500 UTC FRI AUG 25 2017 TC ADVISORY DTG: 20170825/1500Z TCAC: KNHC TC: HARVEY NR: 021 PSN: N2642 W09600 MOV: NW 09KT C: 0947HPA MAX WIND: 095KT FCST PSN + 06 HR: 252100 N2718 W09632 FCST MAX WIND + 06 HR: 100KT FCST PSN + 12 HR: 260300 N2748 W09655 FCST MAX WIND + 12 HR: 100KT FCST PSN + 18 HR: 260900 N2812 W09710 FCST MAX WIND + 18 HR: 095KT FCST PSN + 24 HR: 261500 N2830 W09721 FCST MAX WIND + 24 HR: 085KT RMK THE FORECAST POSITION INFORMATION IN THIS PRODUCT IS INTERPOLATED FROM OFFICIAL FORECAST DATA VALID AT 0000... 0600...1200...AND 1800Z. NXT MSG: 20170825/2100Z ..