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.
The Fujita scale is used to determine how powerful a tornado is. The highest on the scale - an F5 - is used to categorise tornadoes travelling at up to 318mph (511km/h). These tornadoes can cause ...