IntuVueRDR-7000 Weather Radar Pilot's Guide
Principles of Weather Radar Use D201911000094
52 Rev 0, Feb 2020
SHADOWED AREAS
Extremely heavy rainfall or high terrain can reduce the ability of the
radar to penetrate and present a full picture of the weather area. This
is called radar attenuation. Use GMAP mode along with the weather
modes to identify areas of shadowing. Observe the ground returnsin
the area behind the strong weather echo. With very heavy intervening
rain, the ground returns behind the echo will not be present but
rather will display as a shadow. This may indicate a larger area of
precipitation than shows on the weather display.
Corresponding GMAP display. The
lack of radar returns in the circled
areas indicates that terrain or very
heavy rain in front of those areas
prevents the radar signal from
penetrating any farther.
Weather display. Note the area of
apparent clear weather behind the
storm cells. If the GMAP display
shows a shadow in this area, there
may be weather here that the radar
cannot see.
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