Garmin Pilot User's Guide download pdf (Page 184)

Garmin Pilot for iOS User’s Guide

190-01501-00 Rev. N

166

Fly

OverviewPlanFileFlySubscriptionsAppendicesIndex

NEXRAD Abnormalities

There are possible abnormalities regarding displayed NEXRAD images. Some, but

not all, of those include:

•Groundclutter

•Strobesandspuriousradardata

•Sunstrobes,whentheradarantennapointsdirectlyatthesun

•Militaryaircraftdeploymetallicdust(chaff)whichcancausealterationsinradar

scans

•Interferencefrombuildingsormountains,whichmaycauseshadows

•PoorreceptionfromGroundBasedTransceivers(GBTs)cancauseportionsofthe

received radar imagery to not be displayed

NEXRAD Limitations

Certain limitations exist regarding the NEXRAD radar displays. Some, but not all, are

listed for the user’s awareness:

•NEXRAD basereectivity does notprovide sufcient informationto determine

cloud layers or precipitation characteristics (hail vs. rain). For example, it is not

possible to distinguish between wet snow, wet hail, and rain.

•Radarbasereectivityissampledattheminimumantennaelevationangle.An

individual radar site cannot depict high altitude storms at close ranges, and has

no information about storms directly over the site.

•RadarcoverageinCanadaisonlyavailableinthesouthern1/4ofthecountry.

neXrAd intensity

Colors are used to identify the different NEXRAD echo intensities (reﬂectivity)

measured in dBZ (decibels of Z). “Reﬂectivity” (designated by the letter Z) is the

amount of transmitted power returned to the radar receiver. The dBZ values increase

as returned signal strength increases. Precipitation intensity is displayed using colors

corresponding to the dBZ values.

Radar Intensity

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Garmin Pilot User's Guide Page 184