Photographer Jesse Rockwell was able to capture a stunning timelapse of a pyrocumulus cloud forming over the Rey Fire near Santa Barbara, Calif., on Saturday, August 20.
According to the American Meteorological Society, a pyrocumulus cloud is "a cumulus cloud formed by a rising thermal from a fire."
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The Rey Fire has burned almost 30,000 acres of the Los Padres National Forest and is 30 percent contained, according to the County of Santa Barbara.