See Backing Winds
A counterclockwise shift in wind direction with time or height.
Base Reflectivity is the default NEXRAD weather radar image. Taken from the lowest (½° elevation) slice, it is the primary image.
The average velocity of everything in the volume of NEXRAD weather radar beam.
(slang) A region of storm-scale rotation, in a thunderstorm, which is wrapped in heavy precipitation. This area often coincides with a radar hook echo and/or mesocyclone, especially one associated with an HP storm. The term reflects the danger involved in observing such an area visually, which must be done at close range in low visibility.