LONDON, Ky. – A line of storms rolling through southeastern Kentucky produced a rather ominous sky on Sunday.
Johnnie Nicholson, a self-described "certified weather geek," recorded a time-lapse video showing a shelf cloud moving through London, Kentucky.
Shelf clouds form on the leading edge of a line of thunderstorms when cooler air being expelled by the storms interacts with warm, humid air surrounding them.
While there were no widespread reports of severe weather, at least one tree was reported knocked down by wind in Elcomb, Kentucky, about 75 miles southeast of London.
Shelf clouds are known to produce some of the most spectacular skies. You can learn more about them here.