According to Tropicalstormrisk.com, we are quite likely to experience tropical storm winds on Tuesday, 48 hours from now. My guess would be that the main danger to people in Kumamoto will be the possibility of landslides and flooding due to sudden, intense rain. However, the winds may cause issues as well. Fortunately, however, the wind speeds should be significantly lower when the storm arrives than they are at the moment. At any rate, please be aware of any risks you may face in your particular area and take steps as needed to insure your safety. I’ll post more about this as the storm gets closer.
– KIrk
P.S. The probability of tropical storm winds is so high that it’s hard to see the outline of Kyushu on the map. The border between the purple and red part of the predictive image is about where Kumamoto is.