Streten cloud vortex classification.
W Wave development - localized thickening of a cloud band.
A Early vortex development - "comma cloud" merged with a major cloud band or in isolation.
B Late vortex development - a hook-shaped cloud with a marked slot of clear air.
C Vortex at full maturity - spiral of clear air around a well-defined centre.
D Dissipating vortex - either Dx with considerable cloud near centre, or Dy with fragmentary cloud near centre.
F/G Frontless vortices (or "cut-off lows) - corresponding respectively to Dx and
Dy types but not associated with a cloud band. (Not shown in Fig. 2.7)
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