My favorite site for tracking tropic storms (including typhoons) is http://www.tropicalstormrisk.com
This image shows that Jebi (curiously cute name for a monstrous storm system!) is expected to miss Kumamoto by quite a bit. Even so, folks on the eastern side of the prefecture (Aso, etc.) have almost at 50/50 chance of experiencing tropical storm winds (63-118 kilometers per hour or 39-73 miles per hour).
Until recently, Jebi was the strongest storm on earth – a super typhoon (category 5) with winds as high as 170 mph (273 kmh):
Even if it doesn’t cause us too much trouble here, it may do nasty things in prefectures to our east. As always, take care!
– Kirk