Imagine a 110MPH fastball hiting an object, now imaine hundreds of those fastballs hitting the same object.
I’ve been in a hailstorm before, that stripped vegetation and banged cars up pretty badly. The only thing I could compare as far as the sound would be being in a metal garbage can while it was pelted with gravel continuously for over a half hour. Left two inches worth on the ground, thick ground fog formed as it melted.
That was minor compared to some of these reports.