The image shows different slices through the storm with altitude. Starting at the top left corner, the antenna is at 0.5 degrees, top right is 1.5 degrees, bottom left panel is 2.4 degrees, and right bottom is 4.3 degrees.

The yellow circle shows the "hook" at 0.5 degrees. As the antenna sweeps through higher portions of the storm, the 1.5 through 4.3 degree panels, lower reflectivity values are surrounded by higher reflectivity values, or a bounded weak echo region (aka BWER). This is an indication of a severe storm with a tornado.

The yellow square is Oak Grove.