Weather Product Overview - Garmin G1000 NXi Pilot's Manual

HAZARD AVOIDANCE

WEATHER PRODUCT OVERVIEW

The following is an overview of data link weather products the system can display.
NEXRAD (SIRIUSXM)
Datalink weather radar information cannot be displayed at the same time as relative terrain, echo
NOTE:
tops, icing, or turbulence 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 radar 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.
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Figure 6-7 NEXRAD Weather Product on the Weather Data Link (XM) Page
Garmin G1000 NXi Pilot's Guide for the Cessna Nav III 190-02177-00 Rev. A