as the roll cloud will show clear signs of rotation along the horizontal and vertical axes, like a tornado. Roll clouds along ...

However, it’s still important to know the signs of tornado-friendly conditions. Some things to keep an eye out for: Strong thunderstorms Dark or green-colored sky Large, dark, low-lying clouds ...

Fire tornadoes occur when intense wind combines with conditions in the atmosphere to produce clouds of smoke that reach 20,000 to 40,000 feet, Swain said. These clouds form vortices of flaming hot ...

Some say fire whirls are formed only by heat, while fire tornadoes involve clouds generated by the fire itself. A framegrab taken from video supplied by Leicestershire Fire and Rescue Service ...