This article describes the Japan Meteorological Agency (JMA) severe weather terminology.
The JMA defines precise meanings for nearly all its weather terms as the Information for Severe Weather Preparation (防災気象情報, Bousai Kishō Jōhō).
Less severe events that could be a cause for concern will be issued as a bulletin or an advisory.
Due to its local-scale nature, an advisory is typically issued in advance for public forecast areas where conditions may be favorable for the development of severe weather.
A warning is issued for areas where severe weather is imminent or occurring.