Jack Dykinga / Torre Grande under a lenticular clouds, behind Lago Grey, with icebergs along shoreline. Lago Grey, Chile, Patagonia.

Jack Dykinga / Sunset illuminating lenticular clouds, over Paine Grande, Torres del Paine National Park, Chile.

Jack Dykinga / Glaciers on Mount Rainier, with dawn light on lenticular clouds hanging about the summit's crevasses on the East facing slope. Washington, USA. June 2018.

Jack Dykinga / Lenticular cloud formation rising above the summit of Mount Whitney, eastern Sierra, California, USA, March 2018.

Yva Momatiuk & John Eastcott / Lenticular cloud above cumulus clouds, Jokalsarlon Lagoon, Iceland

Yva Momatiuk & John Eastcott / Lenticular cloud above cumulus clouds, Jokalsarlon Lagoon, Iceland

Yva Momatiuk & John Eastcott / Lenticular cloud above cumulus clouds, Jokalsarlon Lagoon, Iceland

Andrew Peacock / Lenticular cloud formations over coastline, Barff Point, Cumberland East Bay, South Georgia Island

Bruno D'Amicis / Lenticular clouds over Mount Bolza and Campo Imperatore plateau in the Gran Sasso National Park. Central Apennines, Abruzzo, Italy, September 2012.

Yva Momatiuk & John Eastcott / Lenticular and cumulus clouds above peaks, Fitzroy Massif, Los Glaciares National Park, Patagonia, Argentina

Pascal Tordeux / Hikers on trail in the Ubaye valley with Lenticular cloud formation overhead, Alps, France, August 2014.

SCOTLAND: The Big Picture / Ben Nevis and the Ring of Steall in the Mamores at sunrise, from the Devil's Staircase on the West Highland Way, Glencoe, Scotland, UK, October 2016.