On average, thunder can only be heard from a distance of 2 to 4 miles. Lightning can strike up to 10 miles from the outer edges of a cell. By the time you hear the first clap of thunder, you’ve been at risk from a direct hit from lightning for 30 minutes or more.

You could actually be standing in front of the Empire State Building, and be the victim of a strike "Out of a Clear Blue Sky" from the edge of a storm over Newark, N.J.

ThunderBolt Storm Detector will warn you about what’s coming your way, and give you ample time to get safe, and remain safe until ThunderBolt Storm Detector tells you the danger has passed.

The TIME TO CLEAR function on the ThunderBolt Storm Detector automatically calculates the required time margin based on actual storm movement, and takes the guesswork out of safety.