It is usually the season of mists and falling leaves. But autumn this year could bring snow and freezing frost, scientists are warning.
Experts say a disturbance in the cold winds swirling high above the Arctic could bring wintry conditions just weeks from now.
The polar vortex traps some of the coldest air on Earth over the Arctic. But the phenomenon has dramatically weakened and shifted position in recent days, threatening to drag colder weather to parts of Europe and North America.
While not unknown, this year the shift has arrived earlier than ever before. Scientists say it could lead to the Atlantic
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