Analyzing the relationship between heavy rains and extreme winds in Ardabil province

In order to carry out this research, the daily and three-hourly data of precipitation parameters and wind speed and direction were used for a period of 13 years (2009-2021) for 11 Ardabil synoptic stations. Percentile 95% free days were obtained for each station. For statistical analysis and consensus, the condition of choosing a representative day for each station was the simultaneous occurrence of rain and wind as a criterion, and for the sake of brevity, an event was analyzed at Meshkinshahr station. Using TRMM satellite NETCDF data, precipitation density was displayed in GIS software, and wind direction was shown using Golbad software, and synoptic maps were drawn using NCEP data. The statistical results for Meshkinshahr station showed the maximum wind frequency with 56% in the winter season. And the month of March occurred, which often entered the city from the south, but most of the rain was in spring with (41%) and May was the rainiest month. The results of synoptic analysis showed that the prevailing system over the studied area was low pressure over the Aral Lake and the rotating conditions of the air ascent followed. In the east of the Mediterranean Sea and the north of the Black Sea, high-pressure systems have formed, and with their outward movement, they have led the western currents towards the region. Also, the studied area is located in front of the descent axis in the west of Iran, and the positive rotation of the air has led to the strengthening of the divergence in the vorticosphere. The speed of the horizontal movement of the air has reached the speed of the wind and by containing the moisture of the Mediterranean Sea, it has injected 1.2 grams per kilogram of moisture into the atmosphere of the region.