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Gen. Jennie Carignan, the chief of the defence staff, said Monday that the F-35 jet comes with many advantages.

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On the other hand, when the polar jet stream is wavy or weak, parts of it can plunge southward, triggering the dreaded arrival of Arctic air at lower latitudes—the popular concept of the polar ...

The Arctic is the early warning system for climate change and the loss of sea ice is a clear sign it’s in trouble, scientists say. It should be reaching its annual maximum levels of ice at this ...

As the Arctic warms, scientists say the polar vortex will become more unstable and likely to send Arctic air south. In 2018, the Arctic Ocean experienced its second-worst sea ice decline on record.

Miles above the Earth, the two bands of fast-moving air – the polar jet stream and the stratospheric polar vortex – sometimes tango together to influence weather in the northern hemisphere.

Plenty of cold air remains is in place to the north, helping to bring set the stage for a wide band of wintry mix and snow, according to the Weather Prediction Center. CNN values your feedback 1.

By Artemis Moshtaghian, Gene Norman, Lauren Mascarenhas and Robert Shackelford, CNN (CNN) — As the Midwest and Northeast dig out from back-to-back winter storms, new systems are building and are ...

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The polar vortex refers to frigid air that typically circulates the North Pole. When the vortex weakens, the polar jet stream dips further south, leading to a surge of Arctic air into the US.

This is our natural protection against equatorward arctic air invasions. When you warm the Arctic, those pressure differences aren't as great. This results in a slower and wavier jet allowing ...