The Enhanced Fujita Scale: How Tornadoes are Rated
Practically speaking, it is nearly impossible to measure the actual wind speed inside tornadoes, as they can destroy just about any unprotected weather instruments placed in their path. While ingenious storm chasers and engineers have devised vehicles and instrument packs that can withstand a tornado, the logistics and time involved to deploy such devices before every tornado would be inconceivable.
This is why a measurement system for estimating the intensity of tornadoes after their impact was devised, a system known today as the Enhanced Fujita Tornado Intensity Scale.
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