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iPhone 6
Boosted the contrast to bring out the detail in the clouds.
I was at my warehouse in southwest Travis County, Texas prepping one of my trucks for work and simply looked up. Even though I didn't have a real camera with me, I did have my iPhone handy. I've seen clouds like this before and always called them 'strange' clouds. Now, thanks to EarthSky, I know to call them mammatus clouds!