There are three different announcements from the municipality: Evacuation preparation alert (避難準備情報,) Evacuation Advisory (避難勧告,) and Evacuation Directive (避難指示.) Evacuation Directive is the strongest one, and when you hear it, you need to start your evacuation.
Level 1:
避難準備情報 (Evacuation preparation alert)
Call for the residents from its municipality, especially to the elder people and physically disability people, to prepare for the evacuation.
Level 2:
避難勧告 (Evacuation advisory)
Municipality encourages the residents in the area, where could affected by the disaster, to evacuate.
Level 3
避難指示 (Evacuation directive)
Municipality demands the residents to evacuate immediately. This is urgent, and it's highly possible to have serious damages from the disaster. Please start evacuating when you have evacuation directive.
Ref: http://www.city.ise.mie.jp/2622.htm
Level 1:
避難準備情報 (Evacuation preparation alert)
Call for the residents from its municipality, especially to the elder people and physically disability people, to prepare for the evacuation.
Level 2:
避難勧告 (Evacuation advisory)
Municipality encourages the residents in the area, where could affected by the disaster, to evacuate.
Level 3
避難指示 (Evacuation directive)
Municipality demands the residents to evacuate immediately. This is urgent, and it's highly possible to have serious damages from the disaster. Please start evacuating when you have evacuation directive.
Ref: http://www.city.ise.mie.jp/2622.htm