Because the soil is still delivering the storm. The footprint's expansive clay absorbs storm water, swells, and holds that moisture against foundation walls long after the surface ground looks dry, so the wall base re-wets from outside while it dries inside. That is why drying here is verified by readings over days rather than declared by how a room feels, and why a wall that reads wet a month after a dry spell has stopped being a storm question and become a foundation and drainage question. The log distinguishes the two, which is why it is kept.
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