الأنماط السينوبتيكية المصاحبة لأمطار المملكة العربية السعودية : الجزء الثاني

Abstract EN

This part of our research aims to study the patterns of the third, fourth and fifth group, through studing a rainfall case representing each pattern of the three groups.

It has been found that the third group contains two patterns , the most frequent is the pattern (C1), which occurs when the presence of upper air deep trough over the northern and western regions with the presence of thermal low at the surface to 850 hPa level.

Group four also contains two patterns and the most frequent is the pattern (D2), which occurs with the presence of Indian monsson low over ksa at the surface to 850 hpa level associated with convergence area at these levels.

the fifth group contains three patterns, the most frequent one is (e1) which occurs when the presence of inverted upper air trough over the southern region and its movement to the western region with the presence of Sudan low trough at the surface to 850 hPa.