5-10 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. BHazard Awareness5.5.3 FIS-B NEXRADWARNINGNEVER USE NEXRAD WEATHER FOR MANEUVERING IN, NEAR, OR AROUNDAREAS OF HAZARDOUS WEATHER. NEXRAD IMAGES ARE SNAPSHOTS OF PASTWEATHER DATA. THEY ARE NOT SAFE FOR USE AS REAL TIME DEPICTIONS OFNEARBY WEATHER ACTIVITY.NEXRAD weather radar displays a mosaic of precipitation data, colored according toreflectivity. Composite reflectivity images depict the highest radar energy receivedfrom multiple antenna tilt angles at various altitudes. Base reflectivity images depictradar returns from the lowest antenna tilt angle. Per AC 00-63A, FIS-B CONUS andRegional NEXRAD are composite reflectivity images.The precipitation intensity level reflected by each pixel represents the highest level ofcomposite radar reflectivity data sampled in that location.RADAR DATA ANIMATIONSA clear understanding of ground-based Doppler weather radar capabilities willallow you to interpret the NEXRAD weather imagery in the safest way possible.The National Oceanic and Atmospheric Administration hosts a description of thetechnology on its website: https://www.weather.gov/jetstream/doppler_introCONUS NEXRAD Regional NEXRADTo depict trending weather movements over time, an animationfunction stitches the last three to six received radar images togetherin sequence, from oldest to newest, and replays them on acontinuous loop.Play and stop controls are active when three or more NEXRAD imagesare available for playback.
