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A fire whirl — sometimes called a fire tornado — is a “spinning column of fire” that forms when intense heat and turbulent winds combine, according to the National Park Service.

A fire whirl is generated when hot air surges upward and begins to spin.

The fire whirl, sometimes called a fire tornado, and short-range spotting were the result of “dry, receptive fuels and erratic winds from intense surface heating,” the Fire Department’s Air Operations Section said in a tweet.

In September, evacuations were ordered in Old Station, as strong winds created a “fire whirl,” a tornado-like phenomenon that can fling flaming embers miles ahead of it.

The blaze generated a massive fire whirl over the weekend that sent smoke and flames aloft.