What signifies a red alert in airport operations?

A red alert in airport operations is often triggered by conditions that can pose immediate safety hazards to both ground personnel and aircraft. In this context, lightning within three miles of the airport is particularly significant because lightning represents a direct threat to personnel working outside, as they are at risk during electrical storms.

When lightning is detected within this range, it necessitates immediate action to protect the safety of ground crews and other personnel. Operations may need to be halted until the storm passes, as it can lead to dangerous conditions on the airfield.

While heavy fog, high winds, and severe weather warnings are important factors to consider in airport operations and can influence safety protocols, the immediate and acute danger posed by nearby lightning makes it a specific trigger for a red alert situation.