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We’ve been hearing lately about the possibility this week of a sequel to the “polar vortex” conditions that swung into North America in the winter of 2014. In this video — for which you might want to grab a snack or a coffee, since it’s about 12 minutes long — storm chaser Cody Ervin explains how a polar vortex functions and what conditions it might produce this week.

If you’ve found any weather-related video lately on YouTube that fellow producers may want to see, send us a link and we’ll feature the best of the best in this space – submit your video here.