My roof, my roof, my roof is on ... the ground?

I don't really know what goes on in my neighborhood, mainly because I never make it to the 7pm home owner meetings.  One morning, I was awoken by a loud pounding that shook the whole room.  When I opened my front door, this is what I found:

Apparently, a huge pile of my roof was lying there -- about two feet high... I hope it doesn't rain this week?