They've named it a blue whirl. "A fire whirl is usually turbulent, but this blue whirl is very quiet and stable without visible or audible signs of turbulence," said Huahua Xiao, coauthor.

A strong fire tornado was observed July 12 in Utah, getting rated as an EF-2 with 122 mph. This is only the third EF2+ tornado to occur in the state of Utah since 2000. This is also the first ...