139 FKNT24 KNHC 121456 TCANT4 TROPICAL STORM ISAAC ICAO ADVISORY NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092018 1500 UTC WED SEP 12 2018 TC ADVISORY DTG: 20180912/1500Z TCAC: KNHC TC: ISAAC NR: 020 PSN: N1500 W05442 MOV: W 15KT C: 1000HPA MAX WIND: 050KT FCST PSN + 06 HR: 122100 N1504 W05602 FCST MAX WIND + 06 HR: 050KT FCST PSN + 12 HR: 130300 N1509 W05722 FCST MAX WIND + 12 HR: 050KT FCST PSN + 18 HR: 130900 N1515 W05843 FCST MAX WIND + 18 HR: 045KT FCST PSN + 24 HR: 131500 N1518 W06012 FCST MAX WIND + 24 HR: 045KT RMK THE FORECAST POSITION INFORMATION IN THIS PRODUCT IS INTERPOLATED FROM OFFICIAL FORECAST DATA VALID AT 0000... 0600...1200...AND 1800Z. NXT MSG: 20180912/2100Z $$