A cloudy sky in the village of Tourond, south of Winnipeg, quickly turned violent Wednesday, marking Manitoba’s first tornado ...

On the Fujita scale, Enhanced Fujita scale, and International Fujita scale, F5, EF5 ... Australia, Canada, and Italy have each had one. Despite being rare, EF5 tornadoes are far more common ...

One particularly long-tracked and devastating tornado hit the major cities of Tuscaloosa and Birmingham, Alabama, killing ...

which rated tornadoes from F0 to F5, based on estimated wind speeds and observed damage. Then, in 2007, the weather service adopted the Enhanced Fujita scale, which better reflected actual storm ...

As cool, dry air from Canada collides with warm ... Here are six of the costliest U.S. tornadoes. The F5 tornado that chewed through Joplin, Missouri, in 2011 remains the costliest twister in U.S.