NEXRAD Limitations (FIS-B)
NEXRAD radar images may have certain limitations:
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At a map range of 30 NM or less, individual blocks of NEXRAD weather data are viewable. For the regional version of the NEXRAD weather product, each block is 1.5 NM wide by 1 NM tall. For the continental United States version of the NEXRAD weather product, each block is 7.5 NM wide by 5 NM wide.
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The continental US version of the NEXRAD weather product is not available above 60º of latitude.
The following may cause abnormalities in displayed NEXRAD radar images:
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Ground clutter.
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Spurious radar data.
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Sun strobes (when the radar antenna points directly at the sun).
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Interference from buildings or mountains, which may cause shadows.
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Metallic dust (chaff) from military aircraft, which can cause alterations in radar scans.