An emergency is an event or situation which threatens serious damage to:
- human welfare
- the environment
It can also be caused by war or terrorism which threatens serious damage to the security of the United Kingdom.
Emergencies are normally unpredictable and can be caused for example by:
- severe weather
- industrial accidents
- power failure
- transport incident or accident
- cyber attack
They can happen suddenly for instance an aircraft crash or can be more gradual like flooding following heavy rain - both equally traumatic and upsetting for those involved.