Pilot's Guide

190-00663-02 Rev. B
Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT/GTi
303
HAZARD AVOIDANCE
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 information.
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.Inadditiontoawidearrayofservices,theNEXRAD
networkprovidesimportantinformationaboutsevereweatherandairtrafcsafety.
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 6-10 NEXRAD Data on the Weather Data Link (XM) Page