Very strong air currents in the upper air westerlies are known as:

Jet streams

Tornados

Blizzards

Chinook winds

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UPSC Geoscientist – 2021

Very strong, narrow air currents in the upper atmosphere, particularly in the westerlies, are known as jet streams.

Jet streams are high-altitude, fast-flowing air currents found at the boundary between different air masses.

The main jet streams are the polar jet and the subtropical jet. They significantly influence weather patterns and the movement of air masses.

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