Kirk with more weather. Here’s a quote from the following page, which also has an English-language video:

“In the town of Yamato, Kumamoto Prefecture, 51 millimeters of intense rain fell during the hour until 8 a.m. on Monday.

The Meteorological Agency says a lingering rain front brought intense precipitation to much of eastern and western Japan intermittently through Sunday. Rivers overflowed and mudslides struck some locations.

Mudslide alerts remain in place in some parts of Saga and Kumamoto prefectures in Kyushu.”