You can't see it above you, but the jet stream's strong winds can have a big influence on the weather you see, and even your ...

One knot equals 1.1 mph. The red flags indicate wind direction. For up-to-date maps of the jet stream (and other weather-related maps) visit the FNMOC Web site.

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 ...

Waves in the jet stream—a consequence of Earth’s rotation and variations ... cool air southward toward the equator west of lows. A map illustrates lines of surface pressure, called isobars ...