Jet Streams
Key Points
1) The border between dry polar air and warm moist tropical air is known as the polar front.
2) Above the polar front, there is a current of fast moving air known as the polar front jet stream
3) The air that blows from west to east can move at speeds around 300-500km/h
4) The boundary between these two areas change based on the season(eg. winter it comes to lower latitudes)
http://en.wikipedia.org/wiki/Jet_stream
2) Above the polar front, there is a current of fast moving air known as the polar front jet stream
3) The air that blows from west to east can move at speeds around 300-500km/h
4) The boundary between these two areas change based on the season(eg. winter it comes to lower latitudes)
http://en.wikipedia.org/wiki/Jet_stream
Summary
Jet Streams are a current of fast-flowing (300 to 500 km/hr) air that flows from west to east. In the winter jet sreams blow south and brings arctic air to Canada, vice versa in summer.