Which situation would trigger a lockdown alert?

A lockdown alert is generally employed to protect individuals from an imminent threat, particularly when there is a risk of violence or harm within the facility. The presence of an armed individual poses a significant danger to the safety of staff and patients, necessitating immediate action to secure the premises and prevent anyone from entering or leaving.

In contrast, severe weather warnings, missing person reports, and fire emergencies, while serious situations, typically require different responses that do not necessitate a lockdown. Severe weather may prompt sheltering procedures, missing person situations might involve alerting law enforcement, and fire emergencies would trigger evacuation protocols rather than lockdowns. Thus, the detection of an armed individual is the clear scenario that warrants a lockdown alert, as it directly relates to ensuring the safety and security of people within the healthcare facility.