When there is a threat inside the building.
When there is a threat of hazard outside or nearby.
When you need to move people from one location to another.
Sample evacuations include bomb threats, fires and interior chemical spills.
When there is a threat or hazard outside and you need to get inside.
When there is severe weather, including tornado, hail, or lightning.
When there is a threat of an explosion.
When there is a HAZMAT incident outside (harmful chemicals or bioterrorism).