Garmin G1000 NXi Pilot’s Guide for the Cessna Nav III 190-02177-00 Rev. ASYSTEMOVERVIEWFLIGHTINSTRUMENTSEISAUDIO PANEL& CNSFLIGHTMANAGEMENTHAZARDAVOIDANCEAFCSADDITIONALFEATURESAPPENDICESINDEX256HAZARD AVOIDANCEFigure 6-10 NEXRAD Weather Product - CanadaPrecipitationAbove 52°NAlways Displaysas MixedNo CoverageAbove 55°NNEXRAD (FIS-B)NOTE: The NEXRAD weather product cannot be displayed at the same time as relative terrain on the samemap.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 providescentralized meteorological information for the continental United States and selected overseas locations. Themaximum 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 mayarrive at the network at different rates and times. Periodically, the weather data provider to FIS-B compilesthe available individual site images from the network to form a composite image, and assigns a single timeto indicate when it created the image. This image becomes the NEXRAD weather product. Individualimages--gathered from each NEXRAD site--differ in age, and are always older than the displayed NEXRADweather product age. The data provider then sends the NEXRAD data to the FIS-B GBTs, which transmit thisinformation 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 displayedweather information contained within the product may be older than the current radar synopsis and may notdepict the current weather conditions. NEXRAD information should never be used as a basis for maneuveringin, near, or around areas of hazardous weather regardless of the information it contains.
