Do hurricanes create they're own enviroment? Yes and really NO. They can improve the outflow and different aspects to the storm, but they dont make them go 1 way or another. Even with a storm like this or in past years such as floyd,,,a trough or other dynamics in the atmosphere will still cause a hurricane to move in the direction of the flow infront of the mid level system or troughiness. So to answer your question really,,,,,,,NO they dont change the path if a they are like cat 4 or 5.