Which alert is activated when lightning is spotted within 10 miles of the airport?

The correct choice of a Yellow Alert being activated when lightning is spotted within 10 miles of the airport is based on standard safety protocols in aviation. A Yellow Alert serves as a precautionary notice to staff and ground operations to initiate measures for safety due to the proximity of lightning activity. This alert prompts heightened awareness and preparation to ensure that all personnel are aware of potential hazards and that safety procedures are put in place to protect both staff and aircraft.

In contrast, other alert types may indicate different levels of urgency or specific situations. A Blue Alert might relate to specific weather conditions that need monitoring but do not necessarily require immediate action like a Yellow Alert when lightning is near. Green Alerts often signify that conditions are normal and safe, while Red Alerts indicate severe and immediate threats requiring urgent responses. Therefore, a Yellow Alert specifically addresses the risks associated with lightning and establishes necessary precautions.