That screenshot? It's the tracks of all the tornadoes over the last 60 years, at least those that caused enough damage to be recorded. It's intimidating, but a little misleading, since that's all of them since 1951. You can see a video of the tracks by year below, produced by IDV Solutions. Each trail (or dot) is an individual tornado; the fiercer the winds the brighter the trail.
You can also find a longer video with the tracks by month here.
NOAA answers some basic questions about tornadoes, here.
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