Using ArcGIS Online and ArcGIS Living Atlas, you can make a tornado map in a minute (or less). @danpisu details how, using the infamous 1974 Super Outbreak. After 49 years, it is still one of the most active and deadliest in history.
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Tornadoes can be mapped using the Tornadoes and Tornado Tracks layers in Living Atlas, coming from official data from NOAA’s Storm Prediction Center.
For more details, see Map in a Minute: Tornado outbreaks using Living Atlas. Go to the Living Atlas blog to find more articles covering Living Atlas.