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2. Polar vortex - Wikipedia

   en.wikipedia.org/wiki/Polar_vortex

   The term polar vortex can be used to describe two distinct phenomena; the stratospheric polar vortex, and the tropospheric polar vortex. The stratospheric and tropospheric polar vortices both rotate in the direction of the Earth's spin, but they are distinct phenomena that have different sizes, structures, seasonal cycles, and impacts on weather.

3. Here's what you need to know about the polar vortex

   www.aol.com/lifestyle/heres-know-polar-vortex...

   While the name for this phenomenon may sound intimidating to some, the polar vortex is actually a completely natural process t. Skip to main content. Sign in. Mail. 24/7 Help ...

4. Think Dallas-Fort Worth has had enough Arctic blasts? Wait ...

   www.aol.com/think-dallas-fort-worth-had...

   The polar vortex is extensive coverage of low pressure and cold air surrounding Earth’s poles. When the vortex is strong and stable, the polar jet stream shifts northward, keeping the cold air ...

5. Sudden stratospheric warming - Wikipedia

   en.wikipedia.org/wiki/Sudden_stratospheric_warming

   The warming is preceded by a slowing then reversal of the westerly winds in the stratospheric polar vortex, commonly measured at 60 ° latitude at the 10 hPa level. [2] SSWs occur about six times per decade in the northern hemisphere (NH), [ 3 ] and about once every 20-30 years in the southern hemisphere (SH).

6. January–February 2019 North American cold wave - Wikipedia

   en.wikipedia.org/wiki/January–February_2019...

   A snowstorm on February 3–4 brought 0.5 to 4 inches (1.3 to 10.2 cm) of snow to parts of Western Washington, including the Puget Sound region, after a winter without measurable snowfall. It was caused by cold air arriving from the north alongside a low-pressure system, dropping temperatures to the 30s and 40s.

7. Brace yourself: Sub-zero wind chill and snow coming with ...

   www.aol.com/brace-yourself-sub-zero-wind...

   The polar vortex is a gigantic, circular area of cold air high up in the atmosphere that typically spins over the North Pole (as its name suggests), USA Today previously reported. It's a normal ...