Landscape: Bi-polar weather

Exceptional light seems easy to come by in the "hills" of Jura on the border between Switzerland and France. I am particularly fond of the light that results from a "bi-polar" weather, where one part of the sky is clear with a brimming sun and the other side is full of an approaching storm of menacingly black clouds. These conditions are probably the only time I can bear photographing trees only. These photos are from a tour a month a go or so, when this bi-polar weather condition was very strong.