The NHC runs a number of computer models and each color is a different model and shows its projected path. Then the NHC uses this and other information to make a prediction. At the top of that image are the names of the models, GFS, GFDL, NAM and others.
Here is the official prediction as of tonight. The shaded cone shape includes the margin of error with the track line in the center. Every six hours a new prediction is issued and the cone is refined.
Compare that to the lasted models.