This shows when the storm is expected to arrive. The “13” is the date (the 13th of October) and the next number is the hour. So, the center of the storm is estimated to be closest to Kumamoto at about noon tomorrow. It’s moving quite slowly. That means that the winds have had time to weaken somewhat. On the other hand, slow moving storms tend to dump more water on an area, increasing the possibility of landslides and floods.