Encyclopedia entry: Jet Stream

DAVID PHILLIPS
Canadian Encyclopedia
01-01-2002
Jet Stream

Author: DAVID PHILLIPS

The jet stream is a band ofWIND moving high above the Earth's surface from west to east. Typically, the jet stream circles the Earth between 8-14 km above the ground. It is 2-4 km deep, 50-150 km wide and a few thousand kilometres long. Speeds occasionally reach 400 km/h but on the average blow over North America at l00-200 km/h, circling the globe in about 5 days. Usually several jet stream systems travel around the Earth, sometimes in a discontinuous band, other times completely encircling the globe. Now and then they branch into 2 or 3 streams, only to merge as a stronger jet ...

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