Range rings are spaced out at 10, 15, 20, and 25 miles out from track.
If lightning is detected within the 25 mile ring heading toward the track, time to be prepared to move to a safe place.
If lightning is detected in the 10 mile ring, the ring will turn red. Get to a safe place immediately!
Lightning can strike up to 10 miles away from the parent thunderstorms. When thunder roars, go indoors!