May 24, 2013
The animation can be found by clicking the link below.
At first glance, it's surprising to see how few tornado warnings were issued for the northern parts of Tornado Alley (Minnesota, Iowa, Missouri), and the large concentration of tornado warnings in the deep south (Alabama, Mississippi, Louisiana).
In all, 2386 tornado warnings were issued and 20,011 severe thunderstorm warnings were issued.
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