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The base reflectivity radar data shows the radar returns from the perspective of a single antenna tilt angle.
The composite reflectivity radar data shows the highest radar energy received from multiple antenna tilt
angles. The display of the information is color-coded to indicate the intensity of the echoes and the type of
precipitation. For the Precipitation legend (Figure 6-69), press the LEGEND Softkey when Precipitation is
selected for display.
The display of no radar coverage is enabled when Precipitation is selected for display. Areas where
precipitation radar coverage is not currently available or is not being collected are indicated in gray shade of
purple. A white tick-marked boundary line depicts the selected coverage area of the Connext Data Request.
This boundary encloses the precipitation data when this weather product is displayed.
R
eflectivity
Reflectivity is the amount of transmitted power returned to the radar receiver. Colors on the Precipitation
display directly correlate to the level of detected reflectivity. Reflectivity as it relates to hazardous weather
can be very complex.
The role of radar is essentially to detect moisture in the atmosphere. Simply put, certain types of weather
reflect radar better than others. The intensity of a radar reflection is not necessarily an indication of the
weather hazard level. For instance, wet hail returns a strong radar reflection, while dry hail does not. Both
wet and dry hail can be extremely hazardous.
The different radar echo intensities are measured in decibels (dB) relative to reflectivity (Z). Weather
radars measure the reflectivity ratio, or the energy reflected
letter Z). The value of Z increases as the returned signal strength increases.
P
ReciPitation
Radar images may have certain limitations:
• Radar composite reflectivity does not provide sufficient information to determine precipitation
characteristics (wet hail vs. rain). For example, it is not possible to distinguish between wet snow, wet
hail, and rain.
190-01895-00 Rev. A
Figure 6-69 Precipitation Data Legend
l
imitations
Garmin G1000 Pilot's Guide for the Diamond DA62
HAZARD AVOIDANCE
No Radar Coverage
Boundary of Connext
weather data request
back to
the radar receiver (designated by the
335
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