As I wrote a minute ago, the winds are likely to pick up in the coming hours. Flooding and landslides resulting from heavy rain, however, are probably a more significant dangers. Here’s an image of a machine translation (Google) of Yahoo’s evacuation page for Kumamoto.
https://crisis.yahoo.co.jp/evacuation/43/
The best way I know of to access a machine translation of this Japanese page is to use the translation option on Google’s Chrome browser. I probably won’t have time to provide continuous updates so if you think you may be in a vulnerable area, please check the page directly. – Kirk