The Polar Vortex explained in augmented reality

8 months 2 weeks 16 hours ago Tuesday, January 29 2019 Jan 29, 2019 Tuesday, January 29, 2019 10:59:00 PM CST January 29, 2019 in Weather
By: Kenton Gewecke, KOMU 8 Chief Meteorologist
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IS THE POLAR VORTEX NEW?

This very real phenomenon was turned into a buzzword in 2014 and has since been used out of context on the regular. The polar vortex is real, but it can’t technically hit us at the Earth’s surface. Let me explain.

THE ATMOSPHERE

The level of our atmosphere where weather such as clouds occurs is called the troposphere and it can extend 7 miles above the Earth’s mean sea level. The next level of the atmosphere is called the stratosphere. This level of the atmosphere is generally too stable for convection to occur, meaning clouds don’t develop here, the ozone layer is also located in the stratosphere. However, there are some systems in the stratosphere that can affect the troposphere. One of these systems is the polar vortex, generally located in the lower stratosphere.

THE POLAR VORTEX

A vortex is circulating air. Over the north pole the polar vortex will circulate counterclockwise; rotating clockwise over the south pole. This circulating arctic air can mix down into the upper troposphere at times. When this happens, cold and dense air forms below, reaching us down at the surface.

The upper-level jet stream in the troposphere will then act as a barrier and wall-in the cold air. However, the jet steam can get wavy and form notches. When this happen it breaks off part of the cold air and pushes it further south, into areas that don’t commonly experience such cold air. Often, when a batch of this cold air breaks off and pushes into the lower 48, it is because of a notch of warm air surging into Alaska.

CONCLUSION

While this brutally cold air at the surface is due to the overarching polar vortex, the polar vortex itself never actually reaches the surface. The cold dense air we feel on Earth’s surface is a side effect of the constantly spinning polar vortexes miles above the poles.

For more fun weather facts and explainers be sure to follow KOMU 8 chief meteorologist Kenton Gewecke on Facebook and Twitter.

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