Kirk here. Some evacuation “orders” have been issued for some parts of Kumamoto due to the heavy rain. I put the word “orders” in parentheses because, even if an order has been issued in your area, it doesn’t necessarily mean that you must go to a shelter. It depends on the specifics of your location within the area with such an order. We discussed this a lot last year. Please see the following for more information:
I would like to stress, though, that heavy rain should be taken seriously and you need to know about the vulnerabilities of your particular area in order to decide how to stay safe. When in doubt, check with people living nearby.
A list of areas for which such orders have been issued can be found on the following page (in Japanese, but tools like Google translate can be used to render it in English):