They reroute planes primarily for dangerous winds and microbursts. An aircraft can and does take lightning strikes. An 11 yr old can't. Children have been KILLED by lightning strikes up to 20 miles away.
Yes, if you have expert knowledge or lightning detectors avail, you can get a more precise answer. But otherwise, it is the height of irresponsibility to ignore the guidelines. I don't care if my insurance covers me or not - I'm not about to risk a child's funeral for a game.
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