LEXINGTON — A supercell thunderstorm embedded in a storm complex tracked through Dawson and Buffalo counties during the late afternoon and evening of Saturday, July 19.
The complex moved into western Dawson County out of Custer County and passed near Cozad, Lexington and moved directly over Overton. Another part of the storm complex tracked to the southwest and caused damage in Gosper, Furnas and surrounding counties.
After the storm complex moved out of the Kearney area, a full double rainbow appeared as the sun’s light illuminated falling rain curtains to the east.
A rainbow is an optical phenomenon caused by refraction, internal reflection and dispersion of light in water droplets resulting in a continuous spectrum of light appearing in the sky.
A secondary rainbow, at a greater angle than the primary rainbow, is often visible. The term double rainbow is used when both the primary and secondary rainbows are visible. In theory, all rainbows are double rainbows, but since the secondary bow is always fainter than the primary, it may be too weak to spot in practice.
Secondary rainbows are caused by a double reflection of sunlight inside the water droplets.
