2 adjectives to describe hailstorm

The next time Casey saw the widow he was on his way to town for more powder, his whole box of "giant" having gone off with a tremendous bang the night before in one of those abrupt hailstorms that come so unexpectedly in the mountain country.

We've had most unseasonable hailstorms which have knocked all the buds off the fruit-trees, so, in addition to other annoyances, we shall have no fruit this year.

2 adjectives to describe  hailstorm