This is the lightning monitoring app (Spark Bug) we use here in Thailand to keep an eye on when to seek shelter. School rules are if it's 10 miles out we clear the fields, etc. At the Spartan race just outside Bangkok this last weekend, the lightning was all around for awhile during an hour or so long thunderstorm. It started just after my family took off to start their race, and the race leaders delayed the next heat for a bit. But they let everyone on the course continue, even with all the metal obstacles, barbed wire crawl, water obstacles, etc. Everyone was safe in the end, no one was struck by lightning! And I enjoyed hanging out under my umbrella refreshed in the cooler temps brought on by the rain.