The most extreme tornadoes have winds over 200 mph and can measure over a mile wide, and it has been over a decade since the ...

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

A study has found the likelihood of a decade-long absence of EF5 tornadoes is low and offers an explanation for the phenomenon, according to NOAA meteorologist Anthony Lyza, lead author on the study.

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 ...