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 system is to blame.
Fox2Now St. Louis3d
1925 Tri-State Tornado: The worst in American history
MISSOURI – The Great Tri-State Tornado, the longest tracked F5 tornado in U.S. history, devastated Southeast Missouri, Illinois, and Southwest Indiana on March 18, 1925, leaving a trail of ...
Tri-State Tornado, deadliest in recorded US history, ripped through Midwestern states 100 years ago
The deadliest twister in recorded U.S. history struck 100 years ago Tuesday, touching down in southeastern Missouri and ...
The Enhanced Fujita Scale: A Tornado Rating System
The Enhanced Fujita Scale provides an estimated range of a tornado's wind speeds, based on the tornado's damage.
SFGate5d
Nearly 700 people were killed 100 years ago this week in the deadliest US tornado
Modern standards qualify the so-called Tri-State Tornado as an F5, a mile-wide funnel with wind ... debris straight ahead/Death seems to come to every door/The strong and weak, the rich and ...
The Weather Channel on MSN7d
Deadly Storms Across Arkansas, Mississippi, Alabama, Tennessee
A monster storm system carrying a high risk tornado threat is barreling through the Southeast after unleashing deadly ...