| http://www.w3.org/ns/prov#value | - A thunderstorm is classified as severe when it has the potential for wind gusts of 58 mph or when it produces hail one inch in diameter. (A good visual gauge to use is that a US quarter ($0.25) is approximately one inch in diameter.) Hail can damage glass, such as skylights or windows, and it can damage vehicles and hurt or possibly kill animals that are left outside.
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