Do not despair just yet - we are still 48hrs + from landfall
The impact in Houston will depend on the track and if the storm veers right and leaves Houston on the left side of the storm impact will be significantly less than the right front
Regardless the right move is to leave - be safe
It is however most un-nerving to pick up and leave a home questioning whether it will be there on your return
I have done this twice here -- Floyd '99 and Frances '04 -- It is a feeling I don't forget