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9 ominous images of roll clouds

Roll cloud in Kentucky

Photo: Scott Davidson/National Weather Service

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Bowling Green, Ky.

Several roll clouds were spotted around central Kentucky on June 28, 2007, as a wave of scattered thunderstorms moved through the area. They signaled the arrival of a "gust front" — the cool rush of wind that often precedes a storm by several minutes.

In this case, the detached gust fronts were a false alarm, with no severe weather in tow. They still offered some memorable images, though, including this one shot by local resident Scott Davidson over Bowling Green.