The worst type of tornado hasn't hit the US for over a decade, perplexing experts
Researches found little evidence that tornadoes were getting weaker. Instead, it appears that a subjective tornado grading ...
USA Today7 天
The worst type of tornado hasn't hit the US for over a decade, perplexing experts
May 20, 2013, marks the last time the United States was hit by the worst type of tornado. On that date, a monster EF5 tornado tore a 17-mile path through the Oklahoma City suburbs, creating "40 ...
Yale Climate Connections7 天
New study reveals potential cause of a ‘drought’ in violent EF5 tornadoes
A quirky aspect of the way we measure twisters helps explain why there hasn't been a top-tier-rated tornado in 12 years.
Yahoo17 天
Where Have All The EF5 Tornadoes Gone? The Surprising Reason Behind The 11-Year Drought
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 ...
The Weather Channel on MSN17 天
Where Have All The EF5 Tornadoes Gone? The Surprising Reason Behind The 11-Year Drought
Despite the number of tornadoes increasing in the U.S., it’s been over 11 years since the last EF5 was recorded. But does that mean the most violent tornadoes are disappearing? A new study gets to the ...