Uploaded October 2019 | Updated September 2026, 2 weeks ago

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Have you ever noticed a dark streak in the late afternoon sky but couldn't figure out what caused it? It was probably a shadow spread across the sky, from a distant cloud. Here's how that happens, along with crepuscular rays.

Meteorologist Alan Sealls, AMS Fellow
Facebook: Alan Sealls Weather
Twitter: @AlanSealls
Web: alansealls.com

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