Anita Evans, Member 16612, sent us two time lapse films of a cloud formation known as the Helm Bar, which forms over the Pennines, the low mountain range that runs down the middle of the north of England. Caused by the wind blowing from the East, at right angles to the hills, the effect is of a rolling cloud bar, viewed here from the window of her workshop.

The first is high-energy Helm:



The second, a relaxed, contemplative Helm: