Weather radar

Weather radar normally allows aircraft to avoid hailstorms, but hail at high altitude – seven of the recorded incidents between 2017-2019 took place above 30,000ft (9,144m) – tends to be dry because the extremely cold temperatures means all moisture is frozen. This means it reflects radar faintly and is difficult to spot. And, as you might expect, larger hailstones are more dangerous than small ones. 

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