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Q. What is the jet stream?

A. There is more than one jet stream. The jet streams are strong winds - up to 200 miles per hour - that are found between five and nine miles above the Earth. They are caused by a contrast in temperatures. The winds blow from west to east. And, they move around as the seasons change. For example, in midsummer, the subtropical jet stream may hoop up with the polar jet stream, and this creates a lot of big storms. The polar jet stream zigzags a lot, while the subtropical jet stream zigzags less but sometimes is split into two streams.