“The polar vortex has been particularly strong and stable the past few weeks. That has kept the coldest of Arctic air largely confined to the North Pole,” says Mike Bettes, meteorologist with ...

For the purposes of this article, we're talking about the stratospheric polar vortex. It's a semi-permanent area of low pressure that resides over the Arctic. Stable polar vortex: When the ...

The term “polar vortex” might conjure images of mythical icy storms swirling through the North Pole but in reality it’s a ...

Several days with temperatures of 10-20 degrees below the historical average could be dangerous to plants and ruin outdoor ...

A polar vortex collapse is expected over the next two weeks, causing extreme winter weather and travel disruption across North America. The weather phenomenon is expected to develop in mid-March, ...

Should the vortex be weakened, the jet stream ends up less stable. A polar vortex collapse resulted in widespread snowstorms and below freezing temperatures that affected millions of Americans.

When the polar vortex is strong and stable, this belt of winds keeps the season’s coldest air locked across the Far North. Occasionally, we’ll see the polar vortex’s circulation weaken and ...

A strong polar vortex is typically associated with a strong and stable jet stream. When the polar vortex is strong, the jet stream tends to flow more powerfully and steadily in a circular pattern ...

When the vortex is weakened, the jet stream can become less stable and lets cold polar air spill southward leading to extreme and unpredictable weather. Mr Pastelok explained that there is a small ...

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