Mammatus clouds in the sky over St. Nicholas Church in East Chicago, Ind., following a thunderstorm, Wednesday, June 10, 2015. Mammatus clouds are formed by cool air sinking rapidly from the upper atmosphere.

For the past several years, whenever I’ve sat down to begin selecting my favorite images for this year-end blog, I’ve gotten an overwhelming feeling of worry. I’ve always second-guessed whether I’ve shot enough things throughout the year that stand out enough to be featured together in a best-of collection. Typically, my worries go unfounded, and I’m left struggling to narrow down 50 or more of my favorite images to a palatable selection.

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