What are flash floods? And what is the relationship of sudden torrents with cases of atmospheric instability?

<p style=";text-align:left;direction:ltr"><strong>Weather of Arabia - What are sudden torrential rains and how do they form? And what is the relationship of sudden torrents with cases of atmospheric instability?</strong></p><p style=";text-align:left;direction:ltr"></p><h2 style=";text-align:left;direction:ltr"> <strong>What is the relationship of torrential rains with cases of <a href="https://www.arabiaweather.com/content/%D8%A7%D9%84%D9%81%D8%B1%D9%82-%D8... instability</a> ?</strong></h2><h3 style=";text-align:left;direction:ltr"> <strong>What is the main factor and cause of the formation of torrents?</strong></h3><ul style=";text-align:left;direction:ltr"><li style=";text-align:left;direction:ltr"> Heavy and dense precipitation in a short time, in cases of atmospheric instability, is a major factor and cause in the formation of torrential rains. For example, 50 mm of rain may fall in a period not exceeding 30 minutes, and that particular area may have an annual rainfall rate of only 100 mm, with half of this rate falling. Annual in only half an hour (50 mm of rain means 50 liters per 1 square meter).</li><li style=";text-align:left;direction:ltr"> This rain when it falls with such force and with the presence of a rocky geographical environment, in addition to a difference in height and in addition to that the presence of dry years that precede these cases, and therefore the rain water does not find a way for it to absorb into the interior of the earth, so it remains on the surface of the earth and then begins to flow and enters its streams that may Previously excavated, it is called the streams of torrents or the valleys of torrents.</li><li style=";text-align:left;direction:ltr"> When this water begins to run, it runs at a very high speed of up to 10 meters per second, and becomes sweeping and takes everything in its path of metal objects and rock blocks, and at times it washes away vehicles and cars. Water outfalls, such as flowing into a river, sea, or lake.</li><li style=";text-align:left;direction:ltr"> These torrents, when seen from the outside, are believed to be slow moving, but when they start and enter a specific area, they are of great speed, and if a large-sized vehicle passes through it at that time, it may be completely swept away, also because of the turbidity of the torrential waters and the inability to see what is happening from During it, this poses a greater risk that there will be large rocky objects that hit the human body very quickly.</li></ul><h3 style=";text-align:left;direction:ltr"> <strong>There is another phenomenon called torrential transmission:</strong></h3><p style=";text-align:left;direction:ltr"> Where rain falls on the top of the mountains and the weather in the valleys is completely sunny, this heavy rain leads to the formation of torrents following the flow of torrents and reaches after a certain period of time to another area where the weather is sunny, so the residents are surprised by these torrents, and the greatest danger lies here when the strength of these torrents increases and they leave And thus it may hit other areas of villages, towns and cities near these torrents.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> Therefore, it is necessary to be careful to follow <a href="https://www.arabiaweather.com/content/%D8%A7%D8%B1%D8%B4%D8%A7%D8%AF%D8%... necessary instructions during torrents</a> .</p>