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A strong supercell thunderstorm is shown in this radar image.  Notice the high-reflectivity "tail" on the southwest side of the storm.  This feature is sometimes referred to as a hook echo, which is often a signature that a storm may be tornadic.  Also of note in this radar image is the very high reflectivity (>70 dBZ) and the weak spike extending outward from the core of the storm, known as a hail spike (or three-body scatter spike).  These signatures suggest that very large hail is likely with this storm.  They are even more pronounced in this radar image taken higher aloft.