How the Polar Vortex Can Bring Arctic Blasts to the U.S. Vast weather patterns can carry blasts of frigid air far from the ...

Moving at roughly 20,505 miles per hour along the distant world's equator, it’s the fastest known jet stream that wraps ...

Think of a jet stream as a river of fast-moving air ... generally blow from west to east in both the Northern Hemisphere and the Southern Hemisphere. Jet streams can also weaken, shift or reform ...