Pentagonal depressions ... what are and when to start?

<h2 style=";text-align:left;direction:ltr"> <strong>The Weather of Arabia - What are the Five-Year Depression?</strong> </h2><p style=";text-align:left;direction:ltr"> The five-year depressions are a decrease in the atmospheric pressure values and are formed in the regions of the desert of Algeria, east of the Moroccan Atlas Mountains. This system of low air pressure moves quickly through the deserts of Libya and Egypt directly towards the eastern basin of the Mediterranean and the Levant region. </p><p style=";text-align:left;direction:ltr"></p><h3 style=";text-align:left;direction:ltr"> <strong>What are the weather phenomena associated with the Khamasin depressions?</strong> </h3><ul style=";text-align:left;direction:ltr"><li style=";text-align:left;direction:ltr"> These depressions bring a significant and significant temperature rise </li><li style=";text-align:left;direction:ltr"> An increase in the concentration of dust in the atmosphere and mobile from the African desert </li><li style=";text-align:left;direction:ltr"> May be associated with the influence of a cold air mass at the end, which lowers the temperature and may rain around God <span>.</span> </li><li style=";text-align:left;direction:ltr"></li></ul><h3 style=";text-align:left;direction:ltr"> <strong>Why was it called the Pentagonal Depressions?</strong> </h3><p style=";text-align:left;direction:ltr"> It was called the Khamasiyya, because its duration is fifty in the period from the vernal equinox to the 21st of March of each year until 10 May of each year <span>.</span> </p><p style=";text-align:left;direction:ltr"></p><h3 style=";text-align:left;direction:ltr"> <strong>What is the relationship between the Khamaseen winds and the Khamacine depressions?</strong> </h3><p style=";text-align:left;direction:ltr"> The Khamaseen winds accompany the Khamasine depression, which is a southeastern seasonal wind loaded with dust and dust, and its source is as we mentioned earlier, the Sahara, which occupies the largest part of North Africa, and its impact reaches the Levant countries, Egypt, and the Arab Gulf states, in addition to Iraq and Yemen. </p><p style=";text-align:left;direction:ltr"> This wind is characterized by being hot and dry winds and loaded with dust and dust. </p><p style=";text-align:left;direction:ltr"></p>