A Lightning Warning will be in effect whenever any lightning is occurring within _____ nautical miles of the installation.

• A. 5
• B. 10
• C. 15
• D. 20

Answer: (A)

Lightning safety around explosives relies on a clear proximity boundary. When any lightning is occurring within a short distance of an installation, the risk that the electrical discharge, ground currents, or induced transients could affect munitions or sensitive equipment is higher. Setting a five nautical mile threshold gives a conservative, practical limit: as soon as storm activity reaches that radius, a Lightning Warning is issued to halt arming or disarming work, secure the area, and protect personnel until the threat passes.

Distances beyond this threshold would unnecessarily suspend operations, while a smaller boundary would not provide adequate protection against lightning effects on ordnance. The five nautical mile rule strikes a balance between safety and operational readiness.