Negative Vorticity Advection(Abbrev. NVA) - the advection of lower values of vorticity into an area.Positive Vorticity Advection(Abbrev. PVA) - Advection of higher values of vorticity into an area, which often
is associated with upward motion (lifting) of the air. PVA typically is found in advance of
disturbances aloft (i.e., shortwaves), and is a property which often enhances the potential for
thunderstorm development.Potential VorticityThis plays an important role in the generation of vorticity in cyclogenesis, especially along the polar front. It is also very useful in tracing intrusions of stratospheric air deep into the troposphere in the vicinity of jet streaks.Relative VorticityThe sum of the rotation of an air parcel about the axis of the pressure system and the rotation of the parcel about its own axis.VorticityA measure of the rotation of air in a horizontal plane. Positive (counter-clockwise or cyclonic) vorticity can be correlated with surface low development and upward vertical motion (in areas of positive vorticity advection).
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