“Before I curl into my sleeping bag, I note the current altitude and barometric pressure,” Anker said. “In the few hours I sleep if I see a change in the altitude or barometric pressure I can get an idea of the coming weather patterns. As it is an inverse relationship between altitude and barometric pressure, if I wake at the same or lower elevation I can be confident the atmospheric pressure has remained constant. If I rise to a higher altitude, I need to be aware as there is a chance of a low pressure moving in.” [...]