<P> Jet streams are fast flowing , narrow , meandering air currents in the atmospheres of some planets , including Earth . On Earth , the main jet streams are located near the altitude of the tropopause and are westerly winds ( flowing west to east ) . Their paths typically have a meandering shape . Jet streams may start , stop , split into two or more parts , combine into one stream , or flow in various directions including opposite to the direction of the remainder of the jet . </P>
<P> Jet streams are fast flowing , narrow , meandering air currents in the atmospheres of some planets , including Earth . On Earth , the main jet streams are located near the altitude of the tropopause and are westerly winds ( flowing west to east ) . Their paths typically have a meandering shape . Jet streams may start , stop , split into two or more parts , combine into one stream , or flow in various directions including opposite to the direction of the remainder of the jet . </P>
a ridge in the jet steam is usually associated with
a ridge in the jet steam is usually associated with
meandering shape
meandering shape