STATISTICAL ANALYSIS OF CONVECTIVE STORMS BASED ON ORADEA AND BOBOHALMA WSR-98D RADAR IN JULY 2004-2015
N. MAIER, T. TUDOSE
ABSTRACT. - Statistical analysis of convective storms based on Oradea and Bobohalma WSR-98D radar in July 2004-2015. Radar data usage for the statistics of convective storms is very useful due to high temporal and spatial distribution. On the other hand, July month is characterized by intense convective processes as a consequence of pronounced radiative heating from the earth's surface so that favors the development of convective storms. The present analyses uses data from Oradea and Bobohalma radars of July month in the 2004-2015 period and the processing concerns the extent of atmospheric instability in the north-west half of Romania, based on reflectivity, vertical integrated liquid (VIL), hail diameter and convective wind speed parameters. Also, it has been determined the diurnal variation, daily number and time duration of convective storms. The graphic materials presents spatial distribution of significant hailstorms (storms producing hail 5 cm or larger in diameter) and storms that cause strong wind speeds (over 90 km/h). It was also considered the fact that the degree of instability of a day is not given only by the number of convective storms, but also the intensity of the phenomena that is generated.
Keywords: convective storm, hail, convective wind, atmospheric instability