As spring approaches, summer systems begin to collapse and the polar vortex rebuilds itself in preparation for fall.

Arab Weather - Meteorologists at the Arab Weather Regional Center said that the countries of the northern hemisphere will enter the fall season from a meteorological perspective at the beginning of next September, as the first day of September is considered the first day of the fall season in meteorology in the northern hemisphere. With the beginning of the fall season, weather systems begin to gradually change, as summer systems begin to collapse and are met by the construction of the Arctic Vortex, heralding the beginning of the fall season.

Summer systems begin to collapse with the onset of the fall season

Climatically, starting from this day (September 1st), the features of change in the distribution of weather systems around the world begin, as the weather systems in the summer begin to collapse and leave the polar regions, high latitudes and subpolar latitudes, with the acceleration of the sun’s apparent journey towards the south, and the length of the night increases. Thus, the tropical air highs that prevailed during the summer begin to gradually retreat and withdraw from the regions of the northern hemisphere, and the centers of thermal air depressions fill up, such as the seasonal depression that dominates the atmosphere of the Arabian Peninsula during the summer.

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The Arctic Vortex begins to build, heralding the approach of autumn

The process of building the Arctic vortex begins when temperatures begin to drop in the fall. Rapid cooling of air over the North Pole causes the polar vortex to strengthen, creating a stronger low-pressure system. This promotes the movement of cold air southward, contributing to cold weather patterns that affect the Northern Hemisphere. The polar vortex causes increased weather activity, such as storms and snow, during the winter, greatly affecting the weather in areas under its influence.

General features of autumn in the northern hemisphere

Autumn is considered a transitional period during which the weather changes and becomes more turbulent in many Arab countries, as the cold basins coming from the north towards the south deepen and penetrate, creating cases of atmospheric instability that lead to the actual beginning of the rainy season in many Arab regions.

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Autumn is also a time for rain and weather instability in the Arabian Peninsula, and a drop in temperatures from the exhausting forties in the summer to more moderate levels. Autumn is a season of waiting and hope for farmers and agriculturalists who await signs and news of rainfall to prepare their agricultural lands and prepare for the upcoming agricultural season. In addition, the months of this season usually witness an increase in the incidence of respiratory diseases due to the fluctuations and differences in temperatures, before the cold air settles in the Arab region during the winter months.

For those interested and specialists: What is the polar vortex?

The Polar Vortex is a circular low-pressure system that forms over the Earth's North and South Poles. It consists of a large mass of cold air that surrounds the pole and is trapped by the Earth's rotation and the Coriolis Effect. This vortex creates an integrated weather system that is greatly influenced by temperature and seasonal changes.

The polar vortex is formed by the interaction between cold air that collects over the poles and the air movement around them. During the winter, the polar vortex expands due to lower temperatures, which leads to a strengthening of the low pressure system. This expansion can cause cold air masses to flow into more temperate regions in the Northern Hemisphere, resulting in severe cold waves.

During the winter, temperatures in the polar regions drop, strengthening and expanding the polar vortex. This expansion can cause cold air masses to flow further south, causing severe cold spells and snowstorms in temperate regions. In the summer, the polar vortex shrinks due to rising temperatures, but it begins to rebuild itself as fall approaches in preparation for the coming winter.

God knows best.