Polar vortex faltering weeks earlier than ever recorded

Résumé détaillé

Meteorologists said Friday they were observing an unprecedented early disruption of the polar vortex, raising the risk of cold snaps across the Northern Hemisphere, though there remains significant uncertainty.

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eteorologists said Friday they were observing an unprecedented early disruption of the polar vortex, raising the risk of cold snaps across the Northern Hemisphere, though there remains significant uncertainty.

The polar vortex is a vast region of cold, low-pressure air that normally circulates from west to east high above the Arctic.

It generally strengthens through autumn and peaks around January. It can weaken in the second half of winter, typically between January and March, sending bitterly cold air spilling south into Europe, North America and Asia.

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