After the sun had set just a minute before 8:00 on Sunday, the sky seemed to split in coloration.

Deep orange and red to the south, and to the north, the sky was dark blue.

James Patrick - Townsquare Media

What caused this separation of color? I asked Emmy Award Winning Meteorologist Nick Stewart of Iowa's News Now and he said it was because of a very tall supercell in the Southeast corner of South Dakota that was casting its shadow onto Iowa.

This supercell was photographed just before Sunset on Sunday evening in Mt. Vernon, South Dakota.

According to Earth Science; 

Direct sunlight shines on some of the clouds, but the shadow of the large cloud prevents direct sunlight from reaching other clouds. Only blue skylight reaches the smaller clouds within the shadow, so they appear somewhat blue or gray. In essence, the bigger cloud casts a very large, dark sunray.

 

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