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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-62
There are many patterns on radar that resemble hook echoes but are
not associated with severe weather. Severe weather hook echoes last
at least 5 minutes and are less than 25 miles in diameter. The favored
location for hook echoes is to the right rear of a large and strong cell,
however, in rare cases tornadoes occur with hooks in other parts of the
cell.
AVOID V-NOTCH BY 20 MILES
A large isolated echo will sometimes have the configuration that is
shown in figure 5-43. This echo is called V-notch or flying eagle
although some imagination may be needed by the reader to see
the eagle. V-notch echoes are formed by the wind pattern at the
leading edge (left front) of the echo. Thunderstorm echoes with
V-notches are often severe, containing strong gusty winds, hail,
or funnel clouds, but not all V-notches indicate severe weather. Again,
severe weather is most likely at S in figure 5-43.
N
v
s
echo movement
AD-15561-R1@
V-Notch Echo, Pendant Shape
Figure 5-43