Japan's weather officials say a low-pressure system and a rain front stretching over the East China Sea are bringing heavy rain to western Japan.

The Meteorological Agency says radar analysis shows that about 110 millimeters of torrential rain fell in an hour on Sunday afternoon in Tsushima City, Nagasaki Prefecture.

The agency is calling on people to be on high alert for possible landslides and flooding.

The agency also says unstable conditions will likely bring heavy rain to western Japan from Monday through Wednesday.

In the 24 hours through Tuesday evening, up to 250 millimeters of rain is expected in the Kyushu and Shikoku regions, up to 200 millimeters in the Kansai region, up to 150 millimeters in Yamaguchi Prefecture and up to 120 millimeters in the Chugoku region.

Weather officials are calling on people to stay alert for landslides, flooding in low-lying areas, swollen rivers, lightning strikes and sudden gusts.