Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
Jet streams are typically continuous over long distances.
In summer, the polar front jet achieves its maximum force.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.  It follows the wave path near the tropopause at elevations of 8 km to 15 km, this statement is not correct.

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