Arab weather - Sinan Khalaf - As soon as October begins each year, memories of the marking season and its rains, which are known for their thunderous character, begin to be reflected in the soil that is quickly covered with plants, announcing the end of the summer and drought months.
The marking begins on October 16 of each year, and continues until December 6, and its duration is 52 days. The marking season is called by this name because it marks the earth with greenery and plants.
There are several clear signs of the beginning of the marking season , including:
With the beginning of the marking days, the seasonal depression begins to recede and decline, to be gradually replaced by the Arab air high, which is largely responsible for pushing the moist air masses from the Arabian Sea towards the Kingdom, in conjunction with the presence of the Red Sea depression to the east of it, which works on a gradual and continuous decrease in temperatures and the refraction of the severity of the atmosphere warm.
The marking is considered the beginning of the actual activity of the Red Sea depression, as it begins to deepen to affect the Levant and the northwestern parts of the Kingdom. The air coming from the north and the Levant region creates a state of atmospheric instability that causes thunder clouds and rain.
The increasing activity of the European high altitude pushes cold air masses towards the eastern basin of the Mediterranean Sea responsible for the formation of air depressions outside the tropical range or depressions of the Mediterranean Sea, and the Red Sea depression interacts with the cold Mediterranean depressions, which works on the development of instability and rainfall that may be Thunderstorms and heavy during the season tag .
The Siberian high air begins at the end of the marking season with a direct impact on the Kingdom and this leads to a significant decrease in temperatures, which calls for wearing winter clothes, and a decrease in temperature occurs, especially at night hours.
Strong cases were often repeated in the marking season, and the closest to memory is what happened in November 2013 in the capital, Riyadh, as well as large areas of the Kingdom when torrential rains formed and heavy rains continued in large parts of the country, and the largest valleys in the Kingdom took place in November 2008 when the rains continued It was heavy for several days, and the strength of the tagging was repeated in many years, the most important of which were 2012, 2004, 1997, and the tagging period may also be weak, as happened in the 2010 marking.
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