Once it's safe to go outside or, if you had to take shelter elsewhere, return to your home, the International Association of Certified Home Inspectors recommends you focus on the following areas during your post-tornado inspection:

Exterior

Check for broken tree branches, especially those that pose a safety risk because they are obstructing access to your home or may be in contact with power lines. (Contact the utility company to remove branches that are on power lines — do not touch or try to remove them yourself.)
Check for damage to windows and exterior doors.
Look for damage to the roof and chimney. Contact a professional if you are not comfortable checking these yourself.
Check gutters, downspouts and exterior drains for damage and clear blockages.

Interior

Before turning utilities on, be sure authorities have confirmed it is safe to do so. Also, be sure to check all appliances for damage. Contact the utility companies if you do not feel safe turning on the water or gas service.
Dispose of perishable foods left in the refrigerator or freezer during an extended power outage.
Check for structural damage and broken glass.
Inspect the basement, crawl space and attic for moisture.

Taking a cautious, deliberate approach when you inspect your home may help keep you and your family safer after a tornado.