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Relative Vorticity 
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Relative vorticity is the sum of shear and curvature vorticities.

The jet stream serves as a good and important example:

The Jet Stream undulates up and down creating ridges and
troughs. The changing of direction of air parcels in the
ridges and troughs leads to curvature vorticity.

The Jet Stream has its strongest winds at the jet axis,
somewhere in the center of the stream. Slower winds are to
the right and left of the jet axis. The difference in
velocity of winds leads to shear vorticity.

In different portions of ridges and troughs, shear and curvature
vorticity work together to increase relative vorticity, in
other portions, they offset each other and decrease relative
vorticity.