Undulations in the westward flow of the upper-air westerlies are referred to as:

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Undulations in the westward flow of the upper-air westerlies are known as Rossby waves. Hadley cells refer to atmospheric circulation cells near the equator, gyres are large systems of rotating ocean currents, the jet stream refers to narrow bands of strong wind in the atmosphere, and the polar front is the zone between cold polar air and warm subtropical air.

Undulations in the Westward Flow of the Upper-Air Westerlies Are