Many people think metal roofs dent easily. Not true. In most cases, a metal roof can withstand decades of abuse from extreme weather like hail, high winds, and heavy snow. Today’s systems also have a 150-mph wind rating (equal to an F2 tornado), meaning your metal roof is also safe from wind gusts that can accompany hail storms.
More Myth-Busters: http://www.metalroofing.com/v2/content/guide/newsletters/04-0701.cfm