The polar vortex is acting weird and the US is paying the price this winter

It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here’s why it keeps happening.

​ It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here’s why it keeps happening. Read More Breaking News, Latest News and Videos | CNN