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TeachMeFinance.com - explain ANOMALOUS PROPAGATION (AP) ANOMALOUS PROPAGATION (AP) The term 'ANOMALOUS PROPAGATION (AP)' as it applies to the area of the weather can be defined as ' Non-standard atmospheric temperature or moisture gradients will cause all or part of the radar beam to propagate along a non-normal path. When non-standard index-of-refraction distributions prevail, 'abnormal' or 'anomalous' propagation occurs. When abnormal downward bending occurs, it is called 'superrefraction.' If the beam is refracted downward sufficiently, it will illuminate the ground and return signals to the radar from distances further than is normally associated with ground targets. The term 'subrefraction' is applied when there is abnormal upward bending of the radar beam'. Previous 5 Terms: anoa Anode Anode anogenic anole Next 5 Terms: anomaly anopheline Anoxic ANPR ansate 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.