understanding of what's behind the polar vortex, and any connection to climate change, with jennifer francis. she's a senior scientist at woods hole research center, welo known its work on the impact of climate change. >> jennifer ancis welcome to e newshour and thanks for making the time. the polar vortex is now a trending hashtag on twitter, lots of people have a lot of questions. let's start with that. what exactly is the polar very mperature and why were we dealing with it right now? >> yes. so the polar vortex is a new word in the lexicon of americans, just starting a few yearago, and it gets used wrongly often. what te polar vy temperature truly is is way up in the atmosphere over the north pole, about 30 miles up is a ring of winds blowing in theun rclockwise direction that keep the cold air bottled up over the arctic, way high up in the atmosphere. so this is called thetrafs, stratospheric polar vortex and what it often gets used wrongly for is to the talk about the jet stream, which is much lower in the atmosphereable, it is really what creates all of our weaer at we feel down here