Climate Adaptation

California Blazes Are Burning Hot Enough to Spur Fire Tornadoes

  • Updrafts can draw in wind and create a billowing pyrocumulus
  • The dense clouds can resemble an erupting volcano’s plume
A firefighter douses flames burning on a property off Cantelow Road during the Hennessey fire in Solano County, California, U.S., on Wednesday, Aug. 19, 2020. More Northern Californians were chased out of their homes by lightning-sparked wildfires that burned out of control in several counties amid a punishing heat wave that pushed temperatures into the triple digits.Photographer: Philip Pacheco/Bloomberg
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As if California wildfires weren’t bad enough, their smoke has started to form self-contained weather systems capable of spinning out lightning and so-called firenadoes.

As wildfires burn, the heat released causes an updraft that draws in winds. If the blaze is big enough, the rising air can create a billowing pyrocumulus, or fire cloud, that can stir dry lightning and even push more wind into the mix. The dense cloud can resembles an erupting volcano’s plume.