The Enhanced Fujita Scale is used to determine the severity of tornadoes: from an EF-0, the weakest, to an EF-5, the strongest. Wind speeds and damage are the main components to rating a storm.

He immersed himself in research on tornadoes and introduced the “Fujita Scale”, a six-point scale to classify degrees of tornado intensity.

The storm’s damage classified the tornado as an EF1 on the Enhanced Fujita Scale, with a maximum wind speed of 90 mph, the weather service said in a preliminary report. The scale ranges from EF0 ...