A recent study explores the puzzling decline in EF5 tornadoes, contributing it to more strict criteria in the Enhanced Fujita scale introduced in 2007. Canada reconsidering multi-billion dollar ...

A quirky aspect of the way we measure twisters helps explain why there hasn't been a top-tier-rated tornado in 12 years.

Tornadoes, the swirling tempests of nature, have fascinated and terrified humanity for centuries. These phenomenal weather ...

Out of all those tornadoes, only 60 (0.085 percent) have ever been rated an F5 or EF-5. 59 of those tornadoes touched down in the U.S., with Canada's sole F5 twister hitting Elie, Manitoba, on June 22 ...

It may be hard to believe that with an average of 1,200 tornadoes each year in the United States, we haven’t seen an EF5-rated twister in more than 11 years. But that doesn’t mean the number ...

Researches found little evidence that tornadoes were getting weaker. Instead, it appears that a subjective tornado grading system is to blame.

The highest ranking on the scale is EF5, indicating "incredible" damage. In the U.S., tornado season usually begins in early March when cold air from Canada clashes with warm, moist air from the Gulf.

“There is an additional threat of F2- EF5 tornadoes over parts of the Lower Mississippi/Tennessee Valleys, the Central Gulf Coast, and the Southeast.” The Federal Emergency Management Agency ...

The other, which had the most severe damage near Diaz in Jackson County, was determined to be a high-end EF4 tornado with maximum winds of 190 mph. For comparison, an EF5 tornado has winds of at ...