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). This article describes JMA terminology and related JMA weather scales. Some terms may be specific to certain regions.

Warning Categories

Severe weather bulletins are issued as an advisory or a warning, depending on the risk or severity of the event. Less severe events that could be a cause for concern will be issued as a bulletin or an advisory.

Meteorological Warnings

Weather advisories and warnings are issued when potentially hazardous weather is occurring or is forecast for the short-term period.

General Warnings

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.



Marine Warnings 

Typhoons or Tropical Depressions 

Flood Forecasting

Seismological Warnings

Earthquake Information

Earthquake Early Warning

Tsunami Warnings

Volcano Information

See also

Notes and references

  1. ^ "Emergency Warning System to be Launched 30 August 2013". Japan Meteorological Agency. 2013. Retrieved 3 August 2013.
  2. ^ "JMA Brochure 2010" (PDF). Japan Meteorological Agency. 2010. Retrieved 31 March 2012.