Heavy rain has been observed in the Kinki and Chugoku regions in western Japan and some areas in eastern Japan through early Monday morning. Weather officials are warning of the possibility of landslides and swollen rivers in some areas.
The Meteorological Agency says a front and a low pressure system caused heavy rain on and off in western Japan through early Monday morning.
The regions of Kanto-Koshin and Tokai also experienced heavy rain.
Heavy rain has been also observed in the Noto Peninsula in Ishikawa Prefecture, which was rocked by a magnitude 6.5 earthquake on Friday. The total amount of rainfall since Saturday has surpassed the amount recorded in the whole month of May in an ordinary year.
Weather officials are urging people in the area to remain on the alert as the rainfall could increase the risk of landslides in the quake-hit areas.
Weather officials say heavy rain of more than 30 millimeters per hour may fall in the Tokai and Kanto-Koshin regions through Monday noon as a low pressure system heads east along the front.
In the 24 hours through Tuesday morning, the Izu Islands could get up to 80 millimeters of rain. The regions of Kanto-Koshin and Tokai could have 60 millimeters and 50 millimeters of rain, respectively.
Weather officials are urging people to be on the alert for landslides, swollen rivers and flooding in areas from western to eastern Japan. Caution is also advised for strong winds, high waves, lightning and tornados.
Meanwhile, the heavy rain and strong wind prompted West Japan Railway Company to suspend operations of six lines across the Kansai region from Monday's first train.
The company also decided to suspend operations partially in Okayama Prefecture and Hiroshima Prefecture due to heavy rain.
The train operator is urging people to check the latest information on its website.