We just learned that the F2 Tornado on the Fujita Scale is roofs torn off, mobile homes destroyed and trees uprooted.
The next level of damage is the F3 tornado - Severe damage.
This is when roofs and walls have been torn off of houses, trains are overturned, most of the trees in a forest are uprooted, and heavy cars are lifted up and thrown.
(from: wikipedia - fujita scale)
Kid Facts - Blast from the past: Cirrocumulus Cloud