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TeachMeFinance.com - explain Positive Vorticity Advection Positive Vorticity Advection The term 'Positive Vorticity Advection' as it applies to the area of the weather can be defined as ' (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'. Previous 5 Terms: Positional cloning Positive Area Positive Cloud to Ground Lightning positive feedback Positive pressure Next 5 Terms: Positive-tilt Trough Positron posology Possession-only license Postage Stamp About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.