000 FKNT24 KNHC 241756 TCANT4 TROPICAL STORM MARCO SPECIAL ICAO ADVISORY NUMBER 18 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142020 1800 UTC MON AUG 24 2020 TC ADVISORY DTG: 20200824/1800Z TCAC: KNHC TC: MARCO ADVISORY NR: 2020/018 OBS PSN: 24/1800Z N2842 W08836 MOV: NW 05KT C: 1008HPA MAX WIND: 035KT FCST PSN +6 HR: 24/2100Z N2903 W08856 FCST MAX WIND +6 HR: 035KT FCST PSN +12 HR: 25/0300Z N2933 W08948 FCST MAX WIND +12 HR: 030KT FCST PSN +18 HR: 25/0900Z N2951 W09048 FCST MAX WIND +18 HR: 030KT FCST PSN +24 HR: 25/1500Z N3007 W09152 FCST MAX WIND +24 HR: 030KT RMK: THE FORECAST POSITION INFORMATION IN THIS PRODUCT IS INTERPOLATED FROM OFFICIAL FORECAST DATA VALID AT 0000... 0600...1200...AND 1800Z. NXT MSG: 20200824/2100Z ??