Never been to Cape, but I spent a lot of nights on TR & BS over ~25yrs, and there are definitely some localized fog patterns that appear and persist in certain creek arms. From being there when it rolled in, it always felt to me that it was a product of the cooling air 'falling' down the hollow, so to speak. It requires calm conditions, but the air falling down the valley makes its' own breeze, from the West in places, the North in others, depending on the creek lay. The straighter (relative in the Ozarks, right?) the valley, the stronger the breeze. In the morning, the compass orientation matters though, the valleys that stay shaded longer hold the fog better.