Definition from Wikipedia
NASA Jetstream animation
Understanding the jetstream
NOAA explanation with diagrams
Various Google found images of Jet Streams
Global winds could explain record rains, tornadoes
Ozone depletion trumps greenhouse gas increase in jet-steam shift
A gigantic jet event observed over athunderstorm in mainland China
Evidence for a wavier jet stream in response to rapid Arctic warming
Jet stream changes cause climatically exceptional Greenland Ice-Sheet melt