(CNN)As the Kincade Fire torched swaths of Sonoma County, California Thursday morning, a menacing flaming spiral stretched skyward while a nearby bystander looked on.

The moment was captured in a striking photograph by Kent Porter, a photojournalist with the Santa Rosa Press Democrat. You’re looking at a weather phenomenon known as a fire whirl, per CNN Weather. And yeah, they’re actually a thing, typically occurring when hot, dry air near the ground rises rapidly in a column, forming a vortex. They should not to be confused with fire tornadoes, which are even bigger and more terrifying. Last year, a massive fire tornado claimed the lives of a firefighter and bulldozer driver battling the Carr Fire.How do 'firenadoes' form?How do 'firenadoes' form?firenadoes weather explainer graphic norman nr vpx_00005624JUST WATCHEDHow do ‘firenadoes’ form?ReplayMore Videos …MUST WATCH

How do ‘firenadoes’ form? 01:24The difference between a fire whirl and a fire tornado (or firenado) mainly has to do with size, according to CNN meteorologist Judson Jones.Read More”A firenado is more like the size of a tornado,” Jones said, “while a fire whirl is a smaller spin up, like a dust devil.”

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