Polar Winds

Cold surface winds from the poles tend to become increasingly unstable as they move equatorward, since the lower part of the air is warmed by the oceans. As a result, there are cumulus clouds which often grow tall enough for precipitation. This explains why exposed coastal areas receive significant rain in the southerly winds which follow the passage of a cold front, even though the air is cold, with little precipitable water (Section 6.6), and despite the subsiding of air behind cold fronts (Chapter 13).

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