Weather officials in Japan say a seasonal rain front is bringing showers over large areas along the Pacific coast, particularly in Shizuoka and Kanagawa prefectures.
The Meteorological Agency calls for caution against landslides, flooding in low areas, swollen rivers, lightning and tornadoes.
Officials say the front is moving north from a location south of the main island of Honshu.
Heavy rains fell in the Tokai and Kanto regions. It was also intensifying in the Kansai region early on Saturday.
The agency said 56 millimeters of rain were recorded within the hour until 4 a.m. in Koshu Town, Yamanashi Prefecture. Yokkaichi town in Mie Prefecture received 53 millimeters of precipitation during the same period.
Hakone City in Kanagawa Prefecture recorded 596.5 millimeters of rain during the 48 hours until 4 a.m. The figure is above the average for the entire month of July.
Landslide warnings have been issued for parts of Shizuoka, Aichi, Kanagawa, Chiba, Ibaraki, Yamanashi, Kyoto, Nara and Shiga prefectures. Some rivers in Shizuoka, Kanagawa and Mie prefectures have exceeded the flood danger level.
The rain front is expected to intensify as it moves north.
Rainfall in excess of 50 millimeters per hour can fall in Shizuoka and Aichi prefectures, southern Kanto region, Koshin region and the Izu Islands.