fire whirl

It might sound like a bad movie, but extreme wildfires can create their own weather - including fire tornadoes. It happened in California as a heat wave helped to fuel hundreds of wildfires across the region, many of them sparked by lightning. One fiery funnel cloud on Aug. 15 was so powerful, the National Weather Service issued what's believed to be its first fire tornado warning. So, what has to happen for a wildfire to get so extreme that it spins off tornadoes? As professors who study wildfires and weather, we can offer some insights.

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