But the biggest difference ... for various types of buildings and structures. As a result, tornadoes that might have been classified as F5 under the old system could now be assigned an EF4 ...

Tornadoes in the U.S. typically increase sharply in spring. Unfortunately, a few of those can be violent tornadoes, particularly in the South. On March 3, 1966, 59 years ago today, an F5 tornado ...

The most tornadoes reported in a single year was 258 in 2015, including the largest outbreak in Central ... Violent tornadoes — those rated F4/EF4 and F5/EF5 — are much rarer.

NORMAN, Okla. – Research recently published in the Bulletin of the American Meteorological Society suggests that the record-long drought of EF5 tornadoes is due to stricter use of damage ratings ...