Appearance
Pyrocumulus is often grayish to brown in color, because of the ash and smoke associated with the fire. It also tends to expand because of the ash involved in the cloud's formation increase the amount of condensation nuclei. This poses a problem, as the cloud can trigger a thunderstorm, from which the lightning can start another fire.
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—François, Duc De La Rochefoucauld (16131680)
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—Ralph Waldo Emerson (18031882)