What does F mean in tornado ratings?

Fujita
Incredible. The Fujita (F) Scale was originally developed by Dr. Tetsuya Theodore Fujita to estimate tornado wind speeds based on damage left behind by a tornado. An Enhanced Fujita (EF) Scale, developed by a forum of nationally renowned meteorologists and wind engineers, makes improvements to the original F scale.

What is the biggest f tornado?

Tri-State Tornado
This article lists various tornado records. The most “extreme” tornado in recorded history was the Tri-State Tornado, which spread through parts of Missouri, Illinois, and Indiana on March 18, 1925. It is considered an F5 on the Fujita Scale, even though tornadoes were not ranked on any scale at the time.

What’s the difference between EF and F tornadoes?

The F-scale is based on the amount of destruction a tornado causes, whereas the EF-scale relies more on wind-speed to determine a tornado TMs rating.

How much did the Fairdale Illinois tornado cost?

In the aftermath of the event, hundreds of citizens assisted in cleanup and recovery efforts. Economic losses from the tornado reached $19 million (2015 USD ).

How is the EF rating of a tornado determined?

The tornado evaluator will then make a judgment within the range of upper and lower bound wind speeds, as to whether the wind speed to cause the damage is higher or lower than the expected value for the particular DOD. This is done for several structures not just one, before a final EF rating is determined.

When was the last EF4 tornado in Illinois?

This was the first EF-4 tornado or stronger in Illinois since two EF-4 tornadoes occurred on November 17, 2013, including one that struck the community of Washington. This was the 33rd EF-4 or stronger tornado in Illinois on record (since 1950).

What was the tornado count for April 9?

THE TORNADO COUNT FROM THE APRIL 9TH EVENT FOR THE NWS CHICAGO COUNTY WARNING AREA STANDS AS FOLLOWS… EF-4: 1 EF-1: 3 EF-0: 3 TORNADOES WERE ON THE GROUND FOR A TOTAL OF 43.5 MILES ACROSS NORTH CENTRAL ILLINOIS. HERE IS A LISTING OF THE CONFIRMED TORNADOES…