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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 5-51
Radar Facts
AVOID STEEP RAIN GRADIENTS BY 20 MILES
Figure 5–43 shows steep rain gradients. Refer to the paragraph,
Interpreting Weather Radar Images, in this section, for a detailed
explanation of weather images.
AD–51781–R1@
Rain Gradients
Figure 5–43
AVOID ALL CRESCENT SHAPED ECHOES BY 20 MILES
A crescent shaped echo, shown in figure 5–44, with its tips pointing
away from the aircraft indicates a storm cell that has attenuated the
radar energy to the point where the entire storm cell is not displayed.
This is especially true if the trailing edge is very crisp and well defined
with what appears to be a steep rain gradient.
When REACT is selected, the area behind the steep rain gradient fills
in with cyan.