Although a closet does provide some additional protection, I’d feel safer having one of these storm shelters in my garage when the going gets really ruff. It should be stocked like “earicks” suggested and maybe a few more items for an extended stay of a day or two.
I’ve been told that if you replace your cell phone, the old phone can still be used to dial 911 as long as you keep it charged.
Here’s a link to a sample shelter:
http://www.usstormshelters.com/mite.html