The jet stream is about six miles up and acts as the major driver for our weather. What is happening this week is a shift from a convergent flow, where air sinks, to a divergent flow, where air rises.

Tornadoes, winter storms and even hurricanes - chances are you've heard at least one of those phenomena mentioned in the same sentence with the jet stream. Here's a meteorology 101 rundown about ...

A multi-century climate record suggests that current Atlantic jet-stream variations are not the cause of an increase in extreme weather events. Read the paper: Past hydroclimate extremes in Europe ...