Velocity Alert: Video shows massive tornado that ravaged the Dallas area in the darkness

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THIS STORY IS ABOUT TO GO VIRAL

Video shows massive tornado that ravaged the Dallas area in the darkness The tornado was only visible when lightning or power flashes illuminated the funnel. Otherwise, it operated by stealth. How does Mashable know what's going viral? Mashable built a system called Velocity, which scours the social web, collecting lots and lots of data around how people are engaging with published articles. It then pulls all of that data back to Mashable, dumps it into our own predictive engine, and predicts which articles are about to go viral. Read more at Mashable.com ▶ Mashable, Inc. is a Delaware Corporation. P.O. Box 64 New York, NY, 10159-0064

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