Originally Posted by
wphamilton
People will tell us that lightning can strike from 10 miles away from a clear sky, and that whenever you hear thunder you must wait 30 minutes to be safe. That's true, sort of, but it always strikes me a bit of fear-mongering. The chances of something like that affecting us are hugely, vastly smaller than a strike during a storm, trivial in comparison. Wait for the gap, then go.
30/30 rule. We covered it in my last first aid/CPR/AED class earlier this month. If the it's less than 30 seconds between the flash and the boom, get to shelter; stay there until at least 30 minutes after the last lighting-thunder <30 seconds occurrence.