CNN —A massive, out-of-control fire burning across both California and Nevada is generating extreme fire behavior, spawning “fire whirls” and creating dangerous conditions for firefighters, authorities said. Firefighters battling the blaze have seen fire whirls – “a vortex of flames and smoke that forms when intense heat and turbulent winds combine, creating a spinning column of fire,” the Mojave National Preserve said Sunday. Crews battlling the York Fire faced "fire whirls" Sunday in the Mojave National Preserve, California. Ty O'Neil/AP“These fire whirls are similar to dust devils but are specifically associated with the heat and energy released by a wildfire,” the Mojave National Preserve said. The struggle to control the York Fire has allowed smoke to reach into Nevada and southern Utah, the fire incident overview noted.

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