Garmin 30a Manuale Proprietario

NEXRAD Radar is a Doppler radar system that has greatly 

improved the detection of meteorological events such as 

thunderstorms, tornadoes, and hurricanes. An extensive 

network of NEXRAD stations provides almost complete radar 

coverage of the continental United States, Alaska, and Hawaii. 

The range of each NEXRAD is 124 nautical miles.

There are possible abnormalities regarding displayed NEXRAD 

images. Some, but not all, of those include:

•  Ground clutter
•  Strobes and spurious radar data
•  Sun strobes, when the radar antenna points directly at 

the sun

•  Military aircraft deploy metallic dust (chaff) which can 

cause alterations in radar scans

•  Interference from buildings or mountains, which may 

cause shadows

Certain limitations exist regarding the NEXRAD radar 

displays. Some, but not all, are listed for the user’s awareness:

•  NEXRAD base reflectivity does not provide sufficient 

information to determine cloud layers or precipitation 

characteristics (hail vs. rain).

•  NEXRAD base reflectivity is sampled at the minimum 

antenna elevation angle. An individual NEXRAD site 

cannot depict high altitude storms at close ranges, and 

has no information about storms directly over the site.

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