GFS model simulations showing a tropical system over Florida August 27-28 during the beginning of the Republican National Convention (StormVistaWxModels.com) For three straight simulations, NOAA’s Global Forecast System (GFS) model has tracked a tropical system right over the Florida peninsula through or close to Tampa just as the Republican National Convention is ramping up. Assuming this system - presently a little swirl in the open Atlantic - strengthens some, it will be named Isaac.