Garmin aera 760 Pilot’s Guide
190-02674-00 Rev. B
103
Hazard Avoidance
Overview
Navigation
Flight Planning
Hazar
d A
voidance
Additional F
eatur
es
Appendices
Index
Radar 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
Radar Limitations
Certain limitations exist regarding the NEXRAD radar displays. Some, but not all, are
listed for the user’s awareness:
• NEXRAD does not provide sufficient 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.
• NEXRAD base reflectivity is sampled at the minimum antenna elevation angle. An
individual NEXRAD site cannot depict high altitude storms at close ranges, and
has no information about storms directly over the site.
• The composite reflectivity is the maximum dBZ reflectivity from any of the
reflectivity angles of the NEXRAD weather radar. (CONUS area only)
Radar 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.
Summary of Contents for Aera 760
Page 1: ...model 760 Pilot s Guide...
Page 2: ......
Page 3: ...OVERVIEW NAVIGATION FLIGHT PLANNING HAZARD AVOIDANCE ADDITIONAL FEATURES APPENDICES INDEX...
Page 10: ...Garmin aera 760 Pilot s Guide 190 02674 00 Rev B Warnings Cautions Notes Blank Page...
Page 12: ...Garmin aera 760 Pilot s Guide 190 02674 00 Rev B RR 2 Blank Page...
Page 263: ......