The map below shows snowfall as a difference ... a ribbon of strong winds in the upper atmosphere called the jet stream. During winter, there are two primary plumes of this fast-flowing air ...

How Would You Define a Jet ... winter months because at this time of year the surface temperature contrasts are greater. The greater the contrasts in surface temperature, the stronger the jet ...

So what is the jet stream? And why is it there? Perhaps your image of the jet stream comes from maps broadcast during the weather portion of your local news. You know the kind: the ones where ...