Climate Change and Climate Disaster

Hail Precipitation Synoptical and Statistical Analysis in North west of Iran (2009-1992)

Document Type : Original Article

Authors

zahra heydari monfared 1
Seyed Hossein Mirmousavi 2

1 University of Zanjan

2 Associate Professor of Climatology, Department of Geography, Zanjan University of Zanjan

Abstract
Hail and identify areas susceptible to precise information on the time of the determination of damages on living organisms, can be extremely important. In this study by taking the role the surface and atmosphere of the North West, this phenomenon with both statistical methods and synoptic, evaluated in order to predict and control it is safer. For such an analysis, using the software Excel, Spss and Gis Hail frequency codes (27, 90-87, 93, 94, 96 and 99) of the 100 Codes about Group 7(willing weather) 25 synoptic stations, the Statistical analysis was performed and the results map was prepared. Based on the data center Ncep/ Ncar synoptic maps of sea level, 850, 700 and 500 hPa cold wind, wet wind, omega, volubility and job front and with selected software Grads were plotted . The results showed that in addition of local factors such as topography of the area, hailing systems such as west winds have been effected in the highest frequency of south west, south and center of the study area. The most frequency of hail is in March to may with peak raining in April as a result of same factors such as the activities of west winds by very cold weather,the humidity of the Mediterranean and Black sea on the region, the temperature difference between the surface of the earth and high levels associated with cold fronts and rising surface air masses.

Keywords

statistical analysis
synoptic analysis
hail
North West

Subjects

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