Supercells are thunderstorms characterized by a deep persistent rotating updraft or mesocyclone. They are well organized long-lived storms that can do significant damage.

Radar features of a supercell

Hook echo or Pendant

The "hook echo" is the area of confluence between the main updraft and the rear flank downdraft (RFD). This indicates the position of the mesocyclone, and possibly a tornado.

Bounded weak echo region (or BWER)

This is a region of low radar reflectivity bounded above by an area of higher radar reflectivity. This is evidence of a strong updraft.

Inflow notch

A "notch" of weak reflectivity on the inflow side of the cell. This is not a V-Notch.

V Notch

A "V" shaped notch on the leading edge of the cell, opening away from the main downdraft. This is an indication of divergent flow around a powerful updraft. 

Supercell types 

Three types have been identified, each of which has slightly different radar signatures that will be explored in subsequent sections: