Yva Momatiuk & John Eastcott / Heavy cumulus clouds gather before storm above sagebrush desert, central Wyoming

Tui De Roy / Broken fast ice under midnight sun and impending storm, Edward VIII Bay, Kemp Coast, east Antarctica

Graham Eaton / Storm clouds (cumulonimbus) building over Minera Moors, with Heather (Calluna vulgaris) in bloom, near Wrexham, Wales, UK, August, August.

Yva Momatiuk & John Eastcott / Sagebrush prairie and heavy cumulus clouds, Nevada

Yva Momatiuk & John Eastcott / Rancher harvesting oats while heavy cumulus clouds gather above, central Wyoming

Yva Momatiuk & John Eastcott / Heavy cumulus clouds gathering before a storm above sagebrush desert, Wyoming

Tui De Roy / Broken fast ice under midnight sun and impending storm, Edward VIII Bay, Kemp Coast, east Antarctica

Tui De Roy / Southern Royal Albatross (Diomedea epomophora) gamming group courting, impending storm over west coast, Col Peak, Campbell Island, New Zealand

Tui De Roy / Broken fast ice under midnight sun and impending storm, Edward VIII Bay, Kemp coast, east Antarctica

Tui De Roy / Broken fast ice, under impending midnight storm, Edward VIII Bay, Kemp coast, east Antarctica

Mitsuaki Iwago / Helmeted Guineafowl (Numida meleagris) family and approaching storm at end of the dry season, Serengeti National Park, Tanzania