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It's very cold, but is it a polar vortex?

Name: It's very cold, but is it a polar vortex?
Uploaded: 2014-02-25T10:08:43-0500
Duration: 1 min 17 s
Description: Meteorologist Megan Glaros, of Chicago station WBBM, talks about the disagreement about whether or not the latest round of sub-zero temperatures in parts of the U.S. is actually another polar vortex.

Meteorologist Megan Glaros, of Chicago station WBBM, talks about the disagreement about whether or not the latest round of sub-zero temperatures in parts of the U.S. is actually another polar vortex.