cold front
polar front

This cold period sees an expansion of the polar front, with ice floating further south across the North Atlantic ocean.

On November 1 Clara turned to the north and transitioned into an extra-tropical low after encountering a polar front.

He wanted rain, or a brisk polar front to blow the cobwebs out of his brains.

In the winter, the tropical anticyclones move south, allowing cold polar fronts to penetrate the region.

The second is a "comma-shaped" signature that is found more frequently with systems closer to the polar front.

In the winter the infiltration of cold air from the polar front is relatively common, and frosts can occur.

The polar front arises as a result of cold polar air meeting warm tropical air.

They surround the polar highs and lie in the wake of the polar front.

Upward currents of air along the polar fronts diverge at high tropospheric altitudes.

These climates are dominated all year round by the polar front, leading to changeable, often overcast weather.