Garmin GDL 88 User Guide - Page 30

Fis-b Nexrad - gdl 88d

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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. 5.1 FIS-B NEXRAD WSR-88D weather surveillance radar or NEXRAD (NEXt generation RADar) is a Doppler radar system that has greatly improved the detection of meteorological events such as thunderstorms, tornadoes, and hurricanes. An extensive network of NEXRAD stations provides almost complete radar coverage of the continental United States, Alaska, and Hawaii. The unobstructed range of each NEXRAD is 124 nautical miles. The FIS-B Function is a graphic weather display capable of displaying graphical weather information on UAT equipped installations. Graphical data is overlaid on the map indicating the rainfall detected by ground based radar for a specific area. 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. An example of how precipitation data is color coded follows: Figure 5-1 Sample FIS-B Weather Precipitation Legend 5-2 GDL 88 ADS-B Transceiver Pilot's Guide 190-01122-03 Rev. A

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5-2
GDL 88 ADS-B Transceiver Pilot’s Guide
190-01122-03
Rev. A
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.
5.1
FIS-B NEXRAD
WSR-88D weather surveillance radar or NEXRAD (NEXt generation RADar) is
a Doppler radar system that has greatly improved the detection of meteorological
events such as thunderstorms, tornadoes, and hurricanes. An extensive network
of NEXRAD stations provides almost complete radar coverage of the continental
United States, Alaska, and Hawaii. The unobstructed range of each NEXRAD is
124 nautical miles.
The FIS-B Function is a graphic weather
display capable of displaying graphical
weather information on UAT equipped installations. Graphical data is overlaid on
the map indicating the rainfall detected by ground based radar for a specific area.
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. An example of how precipitation
data is color coded follows:
Figure 5-1
Sample FIS-B Weather Precipitation Legend