Question

When are upper air winds fastest? anytime surface temperature gradients are weak in summer in winter these winds maintain about the same speed throughout the year.

Answer 1

In winter the upper air winds fastest .

Why wind speed higher in winter ?

Temperature differences between air masses lead to pressure differences and this produces wind. The winter brings higher temperature gradients especially when cold fronts move in from polar regions and this causes wind speeds that are higher than normal.

Since the wind direction at the higher level is parallel to the isobars and its speed  is greater than surface wind this transfer causes the surface wind to veer and increase in speed.

Learn more about air wind :

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