The 'Tornado Warning' flag uses the same colours as the hurricane flag. The background is black and there are two red circles, reflective of the circular motion of a tornado.
Since Hurricanes have their own flag it makes perfect sense that tornadoes get one as well.
Photo Credit: http://taylormarshall.com/2013/05/did-god-send-tornado-problem-of-natural.html
Your flag probably won't work because the time it takes to raise a flag for a tornado warning, the tornado would already be there. You have at best, 30 minutes between the warning and the storm itself.
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