Jet stream are like river of wind high above in the atmosphere. These slim strips of strong winds have huge influence on climate, as they can push air masses around and affect weather patterns. Temperature also influence the velocity of the jet stream.
During winter the jet stream is usually strongest and positioned farther south than other time of year.
South of the jet stream the air is warmer than average. When there is a large northward bulge in the jet stream during winter,heavy coats and wool hat may not be needed when this happen many people suffer sweltering heat wave.
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