Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) near Redrock, Arizona State Trust, Sonoran Desert, Arizona. September 2015. Long exposure with lightning trigger.
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David Allemand / Two Snow geese (Anser caerulescens) during migration, with dark clouds against the sun, Quebec, Canada, October.
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Ingo Arndt / View from Margaret Knoll lookout of sunset and rain clouds over the Indian Ocean and the east coast of Christmas Island, Indian Ocean, Australian Territory, December 2009.
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Sven Zacek / Eilean Donan Castle lit up at twilight with dark clouds. Scotland, UK, September 2013.
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Denis-Huot / Cheetah (Acinonyx jubatus) female standing below dark storm clouds, Masai-Mara game reserve, Kenya.
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David Pattyn / Dalmatian Pelican (Pelecanus crispus) group of pelicans with dark storm clouds approaching, Lake Kerkini, Greece, February
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Theo Bosboom,Theo Bosboom / Abstract reflections of reed and clouds in the water, Texel, the Netherlands, April
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Sandra Bartocha / Dark clouds above the North Sea, Norderney, Germany, September
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Sandra Bartocha / Dark clouds, Mecklenburg-Strelitz, Mecklenburg-Vorpommern, Germany, June
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Ross Hoddinott / Hartland Quay, rugged north Devon coastline, high tide at sunset, Devon, UK, April 2012.
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Graham Eaton / View towards Arenig Fach over open moorland, with stormy sky and dark clouds. Snowdonia NP, Gwynedd, Wales, UK, October
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Brent Stephenson / A cruise ship heads back up the Beagle Channel towards Ushuaia at the end of an Antarctic cruise. Beagle Channel, Tierra del Fuego Archipelago, South America, December.