Sapphire, these are mathematical models of the atmosphere we are looking at. The Hurricane Center uses several models to try to predict what hurricanes are going to do. What you see on weather.com is the current NHC prediction.
Some of us geeks like to dig deeper and look at some of the info the NHC is using. It makes pretty pictures, but it's also subject to a lot of errors. That's why NHC uses many models...they knock them off each other.

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