Now that you see the 2 images side by side . . it's clear that they are not the same buses. Look at how they are parked.
I believe those buses only have a tank capacity to get them about 100 miles down the road before needing fuel, but refueling along the way certainly could have been arranged/ordered. Of course prior planning/arrangements would have had to be made for all the folks at the end destination to care for them during & a few days(??) after the storm, or worst-case-scenario flood-out.
Then too, those folks would have had to be convinced of the necessity to leave.
You can't even tell how many more buses there might be in the picture on the right. I'd like to see a wider view of that parking lot to get the real number.