METEOROLOGIST JEFF HABY
A hook echo is displayed on radar reflectivity. It is a signature produced by precipitation held aloft that wraps
around the mid-level mesocyclone. Since the mesocyclone has counterclockwise winds, the reflectivity signature
of a hook echo will have a cyclonically shaped hook. The area free from reflectivity inside the hook is the
updraft and inflow notch region of the supercell. A hook echo is one clue to a radar operator that a
has a potential of producing a
tornado. Many of the violent tornadoes associated with classic supercells will
show a distinct hook echo.
Below is an instructional webpage showing a hook echo and many other supercell related features.