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Workshop Details

Anomalous propagation

Added on: May 13, 2014         Duration: 7 minutes

NEXRAD from the NWS WSR-88D Doppler radars is probably one of the first products a pilot studies before departing on any cross country flight. For the most part, it provides a very high glance value with very little knowledge or training required to use the product safely. It’s also the data used to build the satellite weather display employed by thousands of pilots in the cockpit. However, the NEXRAD image isn’t always clean and will occasionally display areas of precipitation that are not real. This is generically referred to as ground clutter. A special form of ground clutter called anomalous propagation, better known to meteorologists as AP, is a phenomena that can occur on any NEXRAD display. These false areas of precipitation can be quite annoying since AP can resemble real precipitation, even having characteristics similar to strong thunderstorms. Even more important is that they can slip through even the most sophisticated filters including those employed by satellite-based weather providers such as WxWorx and WSI. In this workshop we’ll take a look at what atmospheric conditions cause AP and how to be sure you don’t get fooled.


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