We just learned that the F1 Tornado on the Fujita Scale is roofs peeled off, and cars are pushed off of roads.
The next level of damage is the F2 tornado - Significant damage.
This is when roofs have been torn off of houses, mobile homes have been destroyed, train boxcars have been turned over, or large trees have been snapped or uprooted.
(from: wikipedia - parameters)
Kid Facts - Blast from the past: Altostratus Cloud
