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Originally Posted by AustinSkyscrapers
How do buildings do that? The clouds are around 30,000 feet high and to the left of the contrail you can see Frost Bank's shawdow!
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I'm pretty sure that's just an optical illusion and coincidence that that shadow vaguely resembles Frost's top. There is no way buildings can affect clouds, unless you're talking about very low clouds/fog. Now, Frost does cast a very unique shadow/formation onto the clouds directly above it when it's very cloudy and foggy. This typically happens in the winter time. Basically all it is is that the floodlights atop Frost light up the clouds, and then in the center of the crown where there are no lights, or few of them anyway, there's a dark spot. The lower the clouds are, the more intense the effect is.

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