NOAA's Storm Prediction Center website has historical data about tornadoes, and they've even plotted the data on a map...
...In addition to the tornado paths that have a beginning & ending coordinate, I also plot a single 'point' for the tornadoes that only have a beginning coordinate in the data (this fills-in a lot of points in Florida, for example).
I make the state borders gray, rather than black, to de-emphasize them -- the red tornado data is the most important thing, and should stand out the most.
Yet another reason to live in the Florida Keys.
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