During a significant snow event in February 2007, a few canopies over gas pumps at gas stations collapsed in Cleveland Ohio.
The canopies had flat roof and there was nowhere the snow could go. Snow is hygroscopic, it absorbs moisture from the air. When new, it weights about 7lb/cft; after absorbing moisture it could weight as much as 30lbs/cft. As the snow load increased with time, the canopies started buckling and eventually collapsed.
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