كليدواژه :
ناوه مديترانه , غرب ايران , بارش شديد , سيستم هاي سنوپتيكي
چكيده لاتين :
In this article, the heavy precipitation period of 7 to 14 March 2005 (16 to 24 Esfand 1385) in West of Iran as an example has been studied. In order to synoptic analysis of mentioned precipitation, daily surface, 850 and 500 Hectopascal air maps is used. This analysis has been done from 48 hours prior to cut full day rainfall. Climatic elements that studied in this analysis include: Daily rainfall and humidity in selected stations in the West of Iran. The results show that low-pressure system in the Mediterranean Sea and the Sudan low through are cause of the precipitations and the Mediterranean Sea, Black Sea and Red Sea in strengthening these systems have importance role. In first day of precipitation, in surface the Mediterranean low-pressure system from northwest and the Sudan low pressure from southwest the Country have been moved to studied area. In the day of rainfall peak, the merge of these systems caused heavy rainfall in the area. On March 13 with exiting of mentioned systems, has been started a stability conditions in the area by progressing of Siberian high pressure system. In the upper levels on first day of rainfall, the through axis along on Turkey, Iraq and the Persian Gulf and west borders of the region. With Moving of the short-wave and change its axis position toward the East, in the surface, the Mediterranean low-pressure has to move forward simultaneously. In this case, all regions in West, located in the east of through and caused of intensified of instability condition and heavy rain.
