Instead of peering out with only a narrow beam as old fashioned radars do, Nexrad can scan vertically as well as horizontally so it can detect precip in the whole airspace of its coverage area.
If the weather around you is good, you’re seeing AP.Īnother potentially confusing aspect of the Nexrad display is the way the radar can scan the entire column of air. AP typically comes and goes: it’s there on one download of the Nexrad mosaic and gone on the next. The air is clear.ĪP can be caused by terrain features reflecting the radar beam, or even by strong inversions in the atmospheric temperature.
There will be a return on the radar-almost always level one green-but there is no precip there. If you’ve flown much with Nexrad in the cockpit you’ve no doubt seen AP. The return is anomalous because it is not the intended target, which is precip. This is called anomalous propagation, or AP for short. It’s a great view, but remember you’re just looking at precipitation-nothing more, nothing less.īut no matter how precise the Nexrad radar is, it can be fooled by a number of phenomenon showing a return that is not precipitation.
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