A giant Pyrocumulus cloud loomed over the Boise Foothills at sunset Friday as wild land firefighters conducted a “burnout” on one flank of the Pioneer Fire north of Idaho City. A burnout is intended to “fight fire with fire” by consuming fuels in a controlled manner.
The cloud is caused by moisture in the fuel rising in the smoke and then creating the pyro cloud atop the smoke. The dramatic display prompted some calls to local 911 dispatch in Boise.
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