Weather officials warn of unstable conditions in north, east Japan

Japanese weather officials are advising people to be alert for lightning strikes, tornadoes and localized downpours, as atmospheric conditions are very unstable in the eastern and northern parts of the country.

The Meteorological Agency says this is due to cold air flowing in at high altitudes and damp air flowing toward a low pressure system that is moving east over the Sea of Japan.

This has caused rain clouds to form in regions including Kanto, Tokai and Hokuriku.

The unstable conditions are expected to continue through Monday in eastern and northern Japan.

Weather officials are advising people to be on the lookout for lightning strikes, tornadoes and other sudden gusts of winds, as well as localized heavy rain and hail.

People are advised to secure their safety by taking shelter in sturdy buildings when it suddenly becomes dark, cold winds start blowing and there is a sign of developed cumulonimbus clouds approaching.