To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of Earth, to the stratospheric polar vortex.

How Earth's atmosphere and climate come together to create a polar vortex

Source: space
Source Link: https://www.space.com/astronomy/earth/how-earths-atmosphere-and-climate-come-together-to-create-a-polar-vortex