[jeff_wilson]

The Banestorm seems to have a ground-level reconciliation mechanism that is effective at least some of the time, IIRC entire villages and fields have arrived intact and kept on, implying that the well came along in working order or they happened to "land" near a replacement water source. Likewise, ships and castaways arrive reporting really stormy weather but nothing like the ocean falling away. Of course, we wouldn't hear from the ones who showed up underwater or underground.

I handled this by having banestorms and other such travel mating up with suitable weather at the far end. The storms are matched for each end's altitude and orientation, and any inaccuracy in the banestorm effect is swallowed up in the disorientation of the normal storm conditions.