The rain was quite heavy this morning in parts of Kumamoto.
The following NHK article says that Yamato-machi got about 20 centimeters of rain in just three hours:
https://www3.nhk.or.jp/nhkworld/en/news/20210517_15/
The following link has an English-language video that reports that a woman in her 70s has gone missing in Yamato-machi. She went to check on her fields and has not been seen since.
– Kirk