Resources

A basic, government-run website talking about planning for tornadoes.
http://www.ready.gov/tornadoes

Two explanations of the Fujita Scale. This is how tornadoes are most commonly measured.
http://www.tornadoproject.com/fscale/fscale.htm
http://en.wikipedia.org/wiki/Fujita_scale

FEMA's document on building a safe room for a home or business. It has a lot of information.
http://www.fema.gov/plan/prevent/saferoom/fema320.shtm

FEMA says that preparedness is the best defense against severe storms and tornadoes.
http://www.fema.gov/news/newsrelease.fema?id=43486

How to build with concrete blocks.
http://www.kighthomecenter.com/build_tips/buildtips/blocks/blocks.html
http://faculty.delhi.edu/hultendc/A220-Week2-Lecture-Web.html