The beginning of the growth of the polar dome in the northern hemisphere heralds the approaching start of winter

Arabia Weather - Every year, as the end of summer approaches and we get closer to autumn, the sun begins its usual cycle of departure and moving away from the northern hemisphere. This would gradually reduce the radiation falling on the atmosphere in the northern hemisphere, especially the region. The North Pole, and thus the cooling process begins in the upper atmosphere, specifically the stratosphere, in which what is usually known as the “polar vortex” is formed.

What is the impact of this process on the climate of the northern hemisphere, especially the Arab countries?

As the polar dome begins to grow little by little, as we mentioned above, and the polar vortex intensifies, this is gradually reflected in the layers near the Earth’s surface in which weather conditions are formed, known as the “troposphere.” As we enter further into the fall season, atmospheric pressure begins to gradually decrease over the North Pole, announcing the beginning of Deep and polar air depressions form, and as is known scientifically, the colder the air, the greater its density and therefore its heaviness, which forces it to go deeper southward to medium and later minimum latitudes.

When the cold air from the Arctic reaches the middle and lower latitudes, it will collide with higher-temperature air, and thus we will have thermal differences, creating conditions of atmospheric instability such as we are currently seeing in some Arab countries.

As we progress more and more into the fall season and approach the winter season, the polar dome grows and the cold air deepens further into the lower latitudes. When the cold air reaches the waters of the Mediterranean Sea, the process of forming air depressions begins here and the weather conditions begin to become more severe in the Arab countries, announcing the beginning of the season that many prefer. " winter season"