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Earth works with an intricate design that allows changes in one element to affect that of another. In the case of the jet stream, when temperatures change, so does the direction of the jet stream. In theory, this may sound like bland scientific assumption, but in practice, it can mean more severe weather in winter or drier months in places that should be wet.
A jet stream is a band of fast-moving air high in the Earth's atmosphere that affects weather patterns, temperatures and air travel. Jet streams are used to forecast the weather because they act as a steering mechanism for storms and other weather fronts.