just determined the circle that will shrink to small sizes so you would still need to go towards the different circle. and in that case, if you build near the edges, you will have to build again because when the circle will shrink, you will be left outside and your base will eventually be left outside the storm.
now that you should not build at the edges of the last big circle then where should you build? the answer is at its center. this is because when it will shrink, there will be a good chance that its mid part will stay within the final circle. so that way, you have 