From Longman Dictionary of Contemporary Englishhailstormhail‧storm /ˈheɪlstɔːm $ -ɔːrm/ noun [countable] DNa storm when a lot of hail falls
Examples from the Corpus
hailstorm• Towering convective clouds rained down a hailstorm of ash, and firebrands even spanned the Grand Canyon of the Yellowstone.• The slight rattle of the windows in the theater builds to a clatter like a hailstorm.• The quay was white and slippery with the granules of a recent hailstorm.• Then came low commodity prices, scab disease, excessive moisture and crop-robbing hailstorms. 