11-50
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Weather
11.4.2 FIS-B
NEXRAD
WARNING:
Never use NEXRAD weather for maneuvering in, near, or
around areas of hazardous weather. NEXRAD images are snapshots of past
weather data. They are not safe for use as real time depictions of nearby
weather activity.
CONUS Selected
on NEXRAD Key
CONUS NEXRAD
Coverage Shown
Out of CONUS
NEXRAD
Coverage
Figure 11-77 FIS-B CONUS NEXRAD
NEXRAD weather radar displays a mosaic of precipitation data, colored
according to reflectivity. Composite reflectivity images depict the highest radar
energy received from multiple antenna tilt angles at various altitudes. Base
reflectivity images depict radar returns from the lowest antenna tilt angle.
Per AC 00-63A, FIS-B CONUS and Regional NEXRAD are composite reflectivity
images.
The precipitation intensity level reflected by each pixel represents the highest
level of composite radar reflectivity data sampled in that location.
Regional Selected
on NEXRAD Key
Out of Regional
NEXRAD
Coverage
Within Regional
NEXRAD Area
but Coverage
Not Available
Figure 11-78 Regional NEXRAD
A clear understanding of ground-based Doppler weather radar capabilities will
allow you to interpret the NEXRAD weather imagery in the safest way possible.
The National Oceanic and Atmospheric Administration hosts a description of
the technology on its website: https://www.weather.gov/jetstream/doppler_intro
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