Tramline
Tramline: Tornado Field Trip
In this virtual field trip students learn about the formation of tornadoes. Students also visit websites where they can research various types of information about tornadoes.
PBS
Nova: Hunt for the Supertwister
This activity will introduce you to the Fujita scale for rating tornado strength. You will then put your knowledge to use by observing photographs of tornado damage and assigning them a rating.
University of Wisconsin
Uw Madison: The Fujita Tornado Damage Scale
Here is a simple chart explaining the levels of tornado damage on the Fujita scale.