Change in the North Pole's sky and chance of a cold wave in December
Recently, there was a big change in the sky above the North Pole (stratosphere).
This change is called [polar vortex], something that happens when the flow of the wind that imprisons the cold air of the noth pole gets weak
as the polar vortex gets weak, the cold air flows towards America, Europe, and Asia, and flows to the south.
now, the air temperature on the North Pole suddenly goes up, and this is called [Sudden Temperature Increase in the stratosphere] (SSW).
It has happened that, when this phenomenon occurs, the Polar Vortex gets weaker and weaker, and the cold air spreads to a wider area.
In America, this month there were many hot days, but since now it might abruptly get cold.
According to specialists, such a big change like this one time is very uncommon.
It barely occurs, Particularly in November, something like this happening.
They still dont know whether a big cold wave is coming, but there is a chance that it gets colder in December, and that there is more snow.
On the other hand, it is said that since the changes of the Polar Vortex are known, the weather forecast will get more exact.
However, the satellites used for the observation of the stratosphere had become old, and it is too a problem that there is few data.
Because of this, it is also necessary to be cautious of thee movement of the Polar Vortex.
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