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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-60
Step Procedure
11 Never continue flight towards or into a radar
shadow or the blue REACT field.
WARNING
STORMS SITUATED BEHIND INTERVENING RAIN-
FALL MAY BE MORE SEVERE THAN DEPICTED ON
THE DISPLAY.
If the radar signal can penetrate a storm, the target
displayed seems to cast a shadow with no visible
returns. This indicates that the storm contains a great
amount of rain, that attenuates the signal and prevents
the radar from seeing beyond the cell under observation.
The REACT blue field shows areas where attenuation
could be hiding severe weather. Both the shadow and
the blue field are to be avoided by 20 miles. Keep the
REACT blue field turned on. The blue field will form
fingers that point towards the stronger cells.
Severe Weather Avoidance Procedures
Table 5-12
Configurations of Individual Echoes (Northern
Hemisphere)
Sometimes a large echo will develop configurations which are
associated with particularly severe aviation hazards. Several of these
are discussed below.
AVOID HOOK ECHOES BY 20 MILES
The hook is probably the best known echo associated with severe
weather. It is an appendage of a thunderstorm echo and usually only
appears on weather radars. Figure 5-42 shows a hook echo.