What species would a white owl with a black/gray tail be in Florida?

There is a smallish owl outside my apartment window with some odd coloring that doesn't match Florida wildlife. It is a conservation area, but it seems too lucky for me to have seen a snowy owl down here. Its almost purely white except for the tips of its wings and its tail, which are dark gray or black. There are a few speckles above that but not many. It is about a foot tall, and not too big around. What species would that be?