August 11, 2003, (a) the convective cells distribution, between 1126 UTC and 1925 UTC, using the Medgidia Doppler radar. The center of the image marks both the radar site and the origin of coordinates. The vector represents the mean shear for 1500–6700 m. Red stands for cyclonic rotation, blue for anticyclonic, and black signifies cells before split. The distance is measured in km. (b) Accumulated precipitation in mm, between 1547 UTC and 1847 UTC.