Thorguardian The THORGUARDIAN is the first, totally integrated advance warning system for lightning. The sensor continuously monitors the atmosphere's electrostatic energy as far away as 15 miles and evaluates the potential for lightning within an area of approximately 2 miles in radius. When the system determines a hazardous condition, the air-horns and strobe light provide necessary alerts. As a leader in lightning prediction, THOR GUARD has advanced its state of the art lightning prediction technology by the development of its propriety L125 prediction computer. The entire system can be easily installed outdoors as a single unit, or the control box can be located separately. Under normal conditions, the air-horns have a range of approximately 700 yards, in a 360' pattern. An external status LED indicates THORGUARDIAN is operational.