A Category 4 (131-155 mph [114-135 kt] winds) tropical storm is predicted to his Kumamoto in about 72 hours. A lot could change between now and then but it’s a good idea to be cautious. I’ll post updates here. The image I’m sharing in this post comes from
http://www.tropicalstormrisk.com
I recommend it as a good source of information as the storm approaches.
I have more relevant links under “Typhoon Information” in the “Weather” section of my Kumamoto Links page: