Kirk here with a follow-up on the rain. I just got an extremely loud and (for me) rather annoying notice on my phone that elderly people in Mashiki need to evacuate (I don’t even live in Mashiki, though I’m not too terrible far away). At any rate, the rain is coming down quite hard and I suspect (though I haven’t had a chance to check) that river levels are rising.
When we have heavy rain and I’m wondering how likely it is to continue over the next hour or so, I often check Yahoo!’s “zoom radar” page:
https://weather.yahoo.co.jp/weather/zoomradar/
It not only shows the current situation but how things have changed in the last hour or so and what is predicted for the coming hour.