Jetstreams – IAS Synopsis
Jet streams are fast flowing, narrow bands of wind flowing west to east in the upper layers of the atmosphere, at altitudes of about 8 to 15 kilometers. Jet streams form when warm air masses meet cold air masses in the atmosphere.
Their speeds usually range from 129 to 225 kilometers per hour (80 to 140 miles per hour), but they can reach more than 443 kilometers per hour (275 miles per hour). They are faster in winter when the temperature differences between tropical, temperate, and polar air currents are greater.
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