190-01263-01 Rev. A
Garmin G2000 Pilot’s Guide for the Cessna T240
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Hazard avoidance
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NEXRAD
WarninG:
Do not use the indicated data link weather product age to determine the age of the weather
information shown by the data link weather product. Due to time delays inherent in gathering and processing
weather data for data link transmission, the weather information shown by the data link weather product
may be significantly older than the indicated weather product age.
note:
The NEXRAD weather product cannot be displayed at the same time as terrain, echo tops, turbulence,
or icing data.
The National Weather Service (NWS) operates the WSR-88D, or NEXRAD (NEXt-generation RADar)
system, an extensive network of 156 high-resolution Doppler radar systems. The NEXRAD network provides
centralized meteorological information for the continental United States and selected overseas locations. The
maximum range of a single NEXRAD site is 250 nm.
Individual NEXRAD sites supply the network with radar images, and the images from each site may arrive
at the network at different rates and times. Periodically, the weather data provider compiles the available
individual site images from the network to form a composite image, and assigns a single time to indicate when
it created the image. This image becomes the NEXRAD weather product. Individual images--gathered from
each NEXRAD site--differ in age, and are always older than the displayed NEXRAD weather product age. The
data provider then sends the NEXRAD data to the SiriusXM Weather service, whose satellites transmit this
information during the next designated broadcast time for the NEXRAD weather product.
Because of the time required to detect, assemble, and distribute the NEXRAD weather product, the displayed
weather information contained within the product may be significantly older than the current radar synopsis
and may not depict the current weather conditions. The NEXRAD weather product should never be used as a
basis for maneuvering in, near, or around areas of hazardous weather regardless of the information it contains.
Figure 6-5 NEXRAD Data on the SiriusXM Weather Pane
No Radar Coverage
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