Storm-relative Velocity
Should be able to see mesocyclone couplets better in storm-relative velocity mode. Subtract off storm motion vector from radial velocities to produce radial velocity relative to observer sitting on storm. Storm motion vector can be input from:
- GRIB-derived Bunkers storm velocity
- Observed cell(s) storm velocity shown in Doppler CELL View & VAD
- User-defined storm velocity for each radar as input from perl script on each forecaster's desktop
Ground-based radial velocity
Storm-relative radial velocity using Global Environmental Multiscale (GEM) model output and the Bunker's cell deviation algorithm.
Storm-relative radial velocity based on user-defined criteria