The Meteorological Agency says the winter-type weather pattern has strengthened, bringing with it a cold air mass.
A village in northern Yamagata prefecture had experienced nearly two meters of snow by Saturday.
The snow is expected to continue through Sunday, mainly in coastal areas.

A man shovels snow in the city of Yokote, Akita Prefecture, northern Japan, on Dec. 27, 2018.
Blizzards are forecast in northern Japan. The Hokuriku region may get gusts of up to 126 kilometers an hour through Sunday.
Officials are advising people to be on the alert for avalanches and falling snow that has accumulated on power cables and trees.





