Just curious how those highways were flooded before the storm.  Seems to me that Houston had several days prior to the storm's arrival.

They're evacuating more than just the Keys.  Miami-Dade, the most populated area, is part of the evacuation plan.  There's talk of evacuating more.  What they are doing, smartly, is evacuating methodically, getting those buried the deepest out first.  Florida is water-locked on three sides for most of the state, not just the Keys.

We'll see how this turns out.