Big hailstorm dumps a blanket of hail up to 20 cm thick – France, July 20, 2018

An intense hailstorm hit Morez, Haut-Jura, France on Friday, during the expected severe thunderstorm day across the broader Alpine region, dumping a thick hail of blanket, up to 20 cm thick in some places. Snow ploughs were used to clear roads and parking lots.

This was a remarkable event. While hailstone size remained moderate, the hail blanket thickness was exceptional. What is particularly noteworthy is that this was a blanket of hail, not local accumulations made by storm runoff carrying hailstones. The hail blanket was locally up to 20 cm thick!