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This thunderstorm was seen at sunset near Abilene, Texas on May 17, 1978.

During this 1982 thunderstorm, when the rain-cooled air moved out ahead of the storm, it went under warm moist air, creating a shelf cloud. Notice the bright light blue sky at the top of the picture and the dark gray-black color of the sky below.

A severe thunderstorm in the distance over Elko, NV.