POLAR VORTEX RETURNS
That Polar Vortex, which generated freezing temperatures and lots of snow has decided to make a return visit and it is bringing wind chill factors ranging from 0 to minus 40 degrees F.
This Vortex is normal to Arctic regions because of the polar jet stream. But with the polar jet stream in a weakened state, the vortex has decided to mosey on southward, bringing cold temperatures into much of the North and Midwest.